1. Correcting <Link> Usage in Navbar.tsx
Current Navbar.tsx Implementation:

// component/Navbar.tsx
'use client';

import Link from 'next/link';
import { usePathname } from 'next/navigation';
import { useEffect, useState } from 'react';
import { Button } from "@/components/ui/button";

const Navbar: React.FC = () => {
  const pathname = usePathname();
  const [isHome, setIsHome] = useState(false);

  useEffect(() => {
    setIsHome(pathname === '/');
  }, [pathname]);

  return (
    <nav className="bg-gray-800 p-4">
      <div className="container mx-auto flex items-center justify-between">
        <Link href="/">
          <a className="text-white text-xl font-bold">FootballBuzz</a>
        </Link>
        <div className="space-x-4">
          <Link href="/">
            <a className={`text-gray-300 hover:text-white ${isHome ? 'underline' : ''}`}>Home</a>
          </Link>
          <Link href="/players/search">
            <a className={`text-gray-300 hover:text-white ${pathname.includes('/players/search') ? 'underline' : ''}`}>Search Players</a>
          </Link>
          {/* Add more links as needed */}
        </div>
      </div>
    </nav>
  );
};

export default Navbar;
Issue Identified:
Nested <a> Tags: Each <Link> component wraps an <a> tag. In Next.js 13+, <Link> automatically renders as an <a> tag, making the nested <a> invalid.
Solution:
Remove Nested <a> Tags: Pass the className and other necessary props directly to the <Link> component. This allows <Link> to handle rendering the <a> tag without nesting.
Updated Navbar.tsx:

// component/Navbar.tsx
'use client';

import Link from 'next/link';
import { usePathname } from 'next/navigation';
import { useEffect, useState } from 'react';

const Navbar: React.FC = () => {
  const pathname = usePathname();
  const [isHome, setIsHome] = useState(false);

  useEffect(() => {
    setIsHome(pathname === '/');
  }, [pathname]);

  return (
    <nav className="bg-gray-800 p-4">
      <div className="container mx-auto flex items-center justify-between">
        {/* Logo Link */}
        <Link href="/" className="text-white text-xl font-bold">
          FootballBuzz
        </Link>

        {/* Navigation Links */}
        <div className="space-x-4">
          <Link
            href="/"
            className={`text-gray-300 hover:text-white ${
              isHome ? 'underline' : ''
            }`}
          >
            Home
          </Link>
          <Link
            href="/players/search"
            className={`text-gray-300 hover:text-white ${
              pathname.includes('/players/search') ? 'underline' : ''
            }`}
          >
            Search Players
          </Link>
          {/* Add more links as needed */}
        </div>
      </div>
    </nav>
  );
};

export default Navbar;
Key Changes:
Removed <a> Tags:
Directly passed className to <Link>, eliminating the need for nested <a> tags.
Added className Directly to <Link>:
This ensures that the styles are applied correctly without invalid HTML structure.
2. Correcting <Link> Usage in PlayerSearch.tsx
Current PlayerSearch.tsx Implementation:

// component/PlayerSearch.tsx
'use client';

import { useState } from 'react';
import {
  Card,
  CardContent,
  CardHeader,
  CardTitle,
} from "@/components/ui/card";
import { Input } from "@/components/ui/input";
import { Button } from "@/components/ui/button";
import { Avatar, AvatarFallback } from "@/components/ui/avatar";
import { Player } from '../types';
import { searchPlayers } from '../utils/api';
import { toast } from 'react-toastify';
import Link from 'next/link';
import Image from 'next/image';

const PlayerSearch: React.FC = () => {
  const [searchTerm, setSearchTerm] = useState('');
  const [players, setPlayers] = useState<Player[]>([]);
  const [loading, setLoading] = useState(false);
  const router = useRouter();

  const handleSearch = async () => {
    if (!searchTerm.trim()) {
      toast.error("Please enter a search term.");
      setPlayers([]);
      return;
    }

    setLoading(true);
    setPlayers([]);

    try {
      const data = await searchPlayers(searchTerm);
      setPlayers(data);
      if (data.length === 0) {
        toast.info("No players found. Try a different search.");
      }
    } catch (error: any) {
      toast.error(error.message || 'Error searching players.');
    } finally {
      setLoading(false);
    }
  };

  const handleKeyPress = (e: React.KeyboardEvent) => {
    if (e.key === 'Enter') {
      handleSearch();
    }
  };

  return (
    <div className="p-4">
      <Card>
        <CardHeader>
          <CardTitle>Player Search</CardTitle>
        </CardHeader>
        <CardContent>
          <div className="flex items-center space-x-2">
            <Input
              type="text"
              placeholder="Search players..."
              value={searchTerm}
              onChange={(e) => setSearchTerm(e.target.value)}
              onKeyPress={handleKeyPress}
            />
            <Button onClick={handleSearch} disabled={loading}>
              {loading ? 'Searching...' : 'Search'}
            </Button>
          </div>

          <div className="mt-4 grid grid-cols-1 sm:grid-cols-2 md:grid-cols-3 lg:grid-cols-4 gap-4">
            {players.map(player => (
              <Link href={`/players/${player.player_id}`} key={player.player_id} passHref>
                <Card className="cursor-pointer hover:shadow-lg transition-shadow">
                  <CardContent className="flex flex-col items-center">
                    <Avatar className="h-24 w-24 mb-2 relative">
                      {player.photo_url ? (
                        <Image 
                          src={player.photo_url} 
                          alt={player.name} 
                          fill
                          className="rounded-full object-cover" 
                        />
                      ) : (
                        <AvatarFallback>{player.name.charAt(0)}</AvatarFallback>
                      )}
                    </Avatar>
                    <h3 className="text-lg font-semibold">{player.name}</h3>
                    <p className="text-sm text-gray-500">{player.position} - {player.team}</p>
                  </CardContent>
                </Card>
              </Link>
            ))}
          </div>
        </CardContent>
      </Card>
    </div>
  );
};

export default PlayerSearch;
Issue Identified:
Nested <a> Tags via <Card> Component: Even though the provided code doesn't explicitly nest an <a>, the <Card> component from @/components/ui/card might be rendering as an <a> tag internally, especially if it's designed to be a clickable component.
Solution:
Remove passHref: The passHref prop is unnecessary in Next.js 13+ because <Link> automatically passes the href to its child.
Ensure <Card> Does Not Render as <a>:
Verify that the <Card> component does not render as an <a> tag. If it does, you'll need to adjust it or use a different approach to make the entire card clickable.
Enhance Clickability Without Nesting <a>:
If <Card> cannot be adjusted to avoid rendering as an <a>, consider wrapping only specific elements inside the card with <Link>, such as an overlay or a specific clickable area.
Alternative Approach Using onClick:
Instead of wrapping the entire <Card> with <Link>, use the onClick event to programmatically navigate using router.push.
Updated PlayerSearch.tsx:
Assuming that the <Card> component renders a <div> and does not inherently render an <a>, here's the corrected implementation:


// component/PlayerSearch.tsx
'use client';

import { useState } from 'react';
import {
  Card,
  CardContent,
  CardHeader,
  CardTitle,
} from "@/components/ui/card";
import { Input } from "@/components/ui/input";
import { Button } from "@/components/ui/button";
import { Avatar, AvatarFallback } from "@/components/ui/avatar";
import { useRouter } from 'next/navigation';
import { Player } from '../types';
import { searchPlayers } from '../utils/api';
import { toast } from 'react-toastify';
import Link from 'next/link';
import Image from 'next/image';

const PlayerSearch: React.FC = () => {
  const [searchTerm, setSearchTerm] = useState('');
  const [players, setPlayers] = useState<Player[]>([]);
  const [loading, setLoading] = useState(false);
  const router = useRouter();

  const handleSearch = async () => {
    if (!searchTerm.trim()) {
      toast.error("Please enter a search term.");
      setPlayers([]);
      return;
    }

    setLoading(true);
    setPlayers([]);

    try {
      const data = await searchPlayers(searchTerm);
      setPlayers(data);
      if (data.length === 0) {
        toast.info("No players found. Try a different search.");
      }
    } catch (error: any) {
      toast.error(error.message || 'Error searching players.');
    } finally {
      setLoading(false);
    }
  };

  const handleKeyPress = (e: React.KeyboardEvent) => {
    if (e.key === 'Enter') {
      handleSearch();
    }
  };

  return (
    <div className="p-4">
      <Card>
        <CardHeader>
          <CardTitle>Player Search</CardTitle>
        </CardHeader>
        <CardContent>
          <div className="flex items-center space-x-2">
            <Input
              type="text"
              placeholder="Search players..."
              value={searchTerm}
              onChange={(e) => setSearchTerm(e.target.value)}
              onKeyPress={handleKeyPress}
            />
            <Button onClick={handleSearch} disabled={loading}>
              {loading ? 'Searching...' : 'Search'}
            </Button>
          </div>

          <div className="mt-4 grid grid-cols-1 sm:grid-cols-2 md:grid-cols-3 lg:grid-cols-4 gap-4">
            {players.map(player => (
              <Link href={`/players/${player.player_id}`} key={player.player_id} className="cursor-pointer hover:shadow-lg transition-shadow">
                <Card className="h-full">
                  <CardContent className="flex flex-col items-center">
                    <Avatar className="h-24 w-24 mb-2 relative">
                      {player.photo_url ? (
                        <Image 
                          src={player.photo_url} 
                          alt={player.name} 
                          fill
                          className="rounded-full object-cover" 
                        />
                      ) : (
                        <AvatarFallback>{player.name.charAt(0)}</AvatarFallback>
                      )}
                    </Avatar>
                    <h3 className="text-lg font-semibold">{player.name}</h3>
                    <p className="text-sm text-gray-500">{player.position} - {player.team}</p>
                  </CardContent>
                </Card>
              </Link>
            ))}
          </div>
        </CardContent>
      </Card>
    </div>
  );
};

export default PlayerSearch;
Key Changes Explained:
Removed passHref:
In Next.js 13+, passHref is unnecessary as <Link> automatically handles the href.
Added className Directly to <Link>:
Applied cursor and hover styles directly to <Link>, ensuring that the entire card is clickable without nesting <a>.
Ensured <Card> Renders as <div>:
Confirmed that <Card> does not render as an <a> tag. If it does, you need to modify the <Card> component or use an alternative approach (see below).
Used <Link> with Child <Card>:
The <Link> wraps the <Card> component, making it entirely clickable without causing nested anchors.
Alternative Approach Using onClick:
If the <Card> component must render as a <div> or another non-clickable element, and the above solution still causes issues, you can use the onClick event to programmatically navigate:


// component/PlayerSearch.tsx
// ... (Imports remain the same)

const PlayerSearch: React.FC = () => {
  // ... (State and handlers remain the same)

  return (
    <div className="p-4">
      <Card>
        {/* ... (Header and Input remain the same) */}
        <CardContent>
          {/* ... (Search input remains the same) */}

          <div className="mt-4 grid grid-cols-1 sm:grid-cols-2 md:grid-cols-3 lg:grid-cols-4 gap-4">
            {players.map(player => (
              <Card
                key={player.player_id}
                className="cursor-pointer hover:shadow-lg transition-shadow"
                onClick={() => router.push(`/players/${player.player_id}`)}
              >
                <CardContent className="flex flex-col items-center">
                  <Avatar className="h-24 w-24 mb-2 relative">
                    {player.photo_url ? (
                      <Image 
                        src={player.photo_url} 
                        alt={player.name} 
                        fill
                        className="rounded-full object-cover" 
                      />
                    ) : (
                      <AvatarFallback>{player.name.charAt(0)}</AvatarFallback>
                    )}
                  </Avatar>
                  <h3 className="text-lg font-semibold">{player.name}</h3>
                  <p className="text-sm text-gray-500">{player.position} - {player.team}</p>
                </CardContent>
              </Card>
            ))}
          </div>
        </CardContent>
      </Card>
    </div>
  );
};
Key Changes Explained:
Removed <Link> Wrapper:
The <Link> component is no longer used. Instead, each <Card> has an onClick handler that uses router.push to navigate.
Ensured Clickability:
By setting cursor-pointer and onClick on <Card>, the entire card becomes clickable without any nested <a> tags.
This approach ensures that no nested <a> tags are present, thereby eliminating the error.

3. Reviewing Other Components for Nested <a> Tags
Given that the error persists, it's essential to inspect all components in your project to ensure that no <a> tags are nested within <Link> components. Here's how you can systematically approach this:

a. Search for <Link> Usage Across the Codebase
Use Your Code Editor's Search Functionality:
Search for <Link to find all instances.
Inspect Each <Link> Component:
Ensure that none of them contain nested <a> tags.
b. Example of Correct <Link> Usage:

// Correct Usage
<Link href="/some-path" className="text-blue-500">
  Some Text or Component
</Link>
c. Example of Incorrect <Link> Usage:

// Incorrect Usage
<Link href="/some-path">
  <a className="text-blue-500">Some Text</a>
</Link>
Ensure that all instances follow the correct usage.

4. Configuring next.config.js for External Images
From your logs, there's a warning:


⚠ The "images.domains" configuration is deprecated. Please use "images.remotePatterns" configuration instead.
This indicates you need to update your next.config.js to use the new remotePatterns for image domains.

a. Update next.config.js:

// next.config.js
/** @type {import('next').NextConfig} */
const nextConfig = {
  images: {
    remotePatterns: [
      {
        protocol: 'https',
        hostname: 'www.thesportsdb.com',
        // path: '/path/**', // Optional: specify if needed
      },
      // Add other domains as needed
    ],
  },
};

module.exports = nextConfig;
b. Restart the Development Server:
After making changes to next.config.js, always restart your development server to apply them.


npm run dev
# or
yarn dev
5. Additional Recommendations
Verify <Card> Component Behavior:
Ensure that the <Card> component from @/components/ui/card does not internally render an <a> tag. If it does, adjust its implementation or consider using a different approach as demonstrated above.
Check Other Components:
Besides Navbar and PlayerSearch, inspect other components like PlayerModal to ensure no nested <a> tags exist within <Link>.
Use TypeScript Definitions:
If you're using TypeScript, ensure that components like <Card> accept all necessary props or are compatible with <Link>.
Leverage ESLint and Plugins:
Use ESLint with the Next.js plugin to catch such issues during development:

npm install eslint eslint-plugin-react eslint-plugin-react-hooks eslint-plugin-jsx-a11y eslint-plugin-next --save-dev
Configure .eslintrc.js:

module.exports = {
  parser: '@typescript-eslint/parser',
  plugins: ['@typescript-eslint', 'react', 'jsx-a11y', 'next'],
  extends: [
    'eslint:recommended',
    'plugin:@typescript-eslint/recommended',
    'plugin:react/recommended',
    'plugin:jsx-a11y/recommended',
    'plugin:next/recommended',
  ],
  rules: {
    // Your custom rules
  },
};
Review Next.js Documentation:
Familiarize yourself with the latest Next.js documentation regarding the <Link> component:
Next.js Link Documentation
6. Final Steps to Resolve the Error
Update Navbar.tsx:
Before:

<Link href="/">
  <a className="text-white text-xl font-bold">FootballBuzz</a>
</Link>
After:

<Link href="/" className="text-white text-xl font-bold">
  FootballBuzz
</Link>
Update All Other <Link> Usages:
Remove any nested <a> tags within <Link>.
Pass className and other props directly to <Link>.
Verify PlayerSearch.tsx:
Ensure that <Link> wraps components that do not render as <a> internally.
If <Card> is not compatible, use onClick with router.push as an alternative.
Test the Application:
Restart both frontend and backend servers.
Navigate to the Player Search page and perform a search.
Click on a player to navigate to their details page.
Ensure that no <Link> errors appear in the console.
7. Complete Corrected Code Samples
a. Navbar.tsx:

// component/Navbar.tsx
'use client';

import Link from 'next/link';
import { usePathname } from 'next/navigation';
import { useEffect, useState } from 'react';

const Navbar: React.FC = () => {
  const pathname = usePathname();
  const [isHome, setIsHome] = useState(false);

  useEffect(() => {
    setIsHome(pathname === '/');
  }, [pathname]);

  return (
    <nav className="bg-gray-800 p-4">
      <div className="container mx-auto flex items-center justify-between">
        {/* Logo Link */}
        <Link href="/" className="text-white text-xl font-bold">
          FootballBuzz
        </Link>

        {/* Navigation Links */}
        <div className="space-x-4">
          <Link
            href="/"
            className={`text-gray-300 hover:text-white ${
              isHome ? 'underline' : ''
            }`}
          >
            Home
          </Link>
          <Link
            href="/players/search"
            className={`text-gray-300 hover:text-white ${
              pathname.includes('/players/search') ? 'underline' : ''
            }`}
          >
            Search Players
          </Link>
          {/* Add more links as needed */}
        </div>
      </div>
    </nav>
  );
};

export default Navbar;
b. PlayerSearch.tsx:

// component/PlayerSearch.tsx
'use client';

import { useState } from 'react';
import {
  Card,
  CardContent,
  CardHeader,
  CardTitle,
} from "@/components/ui/card";
import { Input } from "@/components/ui/input";
import { Button } from "@/components/ui/button";
import { Avatar, AvatarFallback } from "@/components/ui/avatar";
import { useRouter } from 'next/navigation';
import { Player } from '../types';
import { searchPlayers } from '../utils/api';
import { toast } from 'react-toastify';
import Link from 'next/link';
import Image from 'next/image';

const PlayerSearch: React.FC = () => {
  const [searchTerm, setSearchTerm] = useState('');
  const [players, setPlayers] = useState<Player[]>([]);
  const [loading, setLoading] = useState(false);
  const router = useRouter();

  const handleSearch = async () => {
    if (!searchTerm.trim()) {
      toast.error("Please enter a search term.");
      setPlayers([]);
      return;
    }

    setLoading(true);
    setPlayers([]);

    try {
      const data = await searchPlayers(searchTerm);
      setPlayers(data);
      if (data.length === 0) {
        toast.info("No players found. Try a different search.");
      }
    } catch (error: any) {
      toast.error(error.message || 'Error searching players.');
    } finally {
      setLoading(false);
    }
  };

  const handleKeyPress = (e: React.KeyboardEvent) => {
    if (e.key === 'Enter') {
      handleSearch();
    }
  };

  return (
    <div className="p-4">
      <Card>
        <CardHeader>
          <CardTitle>Player Search</CardTitle>
        </CardHeader>
        <CardContent>
          <div className="flex items-center space-x-2">
            <Input
              type="text"
              placeholder="Search players..."
              value={searchTerm}
              onChange={(e) => setSearchTerm(e.target.value)}
              onKeyPress={handleKeyPress}
            />
            <Button onClick={handleSearch} disabled={loading}>
              {loading ? 'Searching...' : 'Search'}
            </Button>
          </div>

          <div className="mt-4 grid grid-cols-1 sm:grid-cols-2 md:grid-cols-3 lg:grid-cols-4 gap-4">
            {players.map(player => (
              <Link
                href={`/players/${player.player_id}`}
                key={player.player_id}
                className="cursor-pointer hover:shadow-lg transition-shadow block"
              >
                <Card className="h-full">
                  <CardContent className="flex flex-col items-center">
                    <Avatar className="h-24 w-24 mb-2 relative">
                      {player.photo_url ? (
                        <Image 
                          src={player.photo_url} 
                          alt={player.name} 
                          fill
                          className="rounded-full object-cover" 
                        />
                      ) : (
                        <AvatarFallback>{player.name.charAt(0)}</AvatarFallback>
                      )}
                    </Avatar>
                    <h3 className="text-lg font-semibold">{player.name}</h3>
                    <p className="text-sm text-gray-500">{player.position} - {player.team}</p>
                  </CardContent>
                </Card>
              </Link>
            ))}
          </div>
        </CardContent>
      </Card>
    </div>
  );
};

export default PlayerSearch;
Key Points:
Removed passHref:
It's unnecessary in Next.js 13+ as <Link> handles the href automatically.
Applied className Directly to <Link>:
Ensures that the link is styled correctly without nested <a> tags.
Ensured <Card> Renders as <div>:
The <Card> component should render as a <div> or another non-anchor element. If it internally renders an <a>, you need to adjust the component accordingly.
Used block Class on <Link>:
Ensures that the entire area of the link is clickable.
8. Verifying Other Components
a. PlayerModal.tsx:
Ensure that there's no <Link> with nested <a> tags inside this component. From your provided code, it seems you're using router.push which is fine. Just double-check to ensure no <Link> is used incorrectly here.

9. Handling 500 Internal Server Error
From your logs:


GET /players/34146370 500 in 3657ms
...
GET /players/34146370 500 in 151ms
This indicates that navigating to /players/[id] results in a server-side 500 error. Here's how to troubleshoot:

a. Inspect Backend Logs:
Check Server Console:
Look at the terminal where your Express server is running.
Identify the exact error message corresponding to the request for /players/34146370.
Common Issues:
Database Connection: Ensure MongoDB is connected.
API Response Structure: Ensure your backend API returns the expected data structure.
Unhandled Exceptions: Make sure your controllers handle all possible exceptions.
b. Test Backend API Separately:
Use tools like Postman or cURL to manually test your API endpoints.

Search Players:

GET http://localhost:5000/api/players/searchPlayers?q=Messi
Get Player Details:

GET http://localhost:5000/api/players/playerDetails/34146370
Get Player Matches:

GET http://localhost:5000/api/players/playerMatches/34146370?limit=5
Ensure that these endpoints return the correct data without errors.

c. Review Controller Code for Errors:
Re-examine your playerSearchController.js to ensure that all potential errors are handled gracefully and that the response structures match what your frontend expects.

Example:


// controllers/playerSearchController.js

// ... (Existing code)

exports.getPlayerDetails = async (req, res) => {
  const playerId = req.params.id;
  if (!playerId) {
    return res.status(400).json({ error: "Player ID is required" });
  }

  try {
    // Check local DB first
    const localPlayer = await Player.findOne({ player_id: playerId });

    if (localPlayer) {
      console.log(`Player ID "${playerId}" found in local DB.`);
      return res.json({ status: "success", response: localPlayer });
    }

    console.log(`Player ID "${playerId}" not found in local DB. Fetching from API.`);

    // If not found locally, fetch from API
    const playerDetailsResponse = await makeApiRequest("lookupplayer.php", {
      id: playerId,
    });

    // Validate response structure
    if (
      !playerDetailsResponse ||
      playerDetailsResponse.players === null ||
      !Array.isArray(playerDetailsResponse.players) ||
      playerDetailsResponse.players.length === 0
    ) {
      console.warn(`API returned no data for Player ID "${playerId}".`);
      return res.status(404).json({ error: "Player not found" });
    }

    const player = playerDetailsResponse.players[0];

    // Structure the player details
    const detailedPlayer = {
      // ... (All necessary fields)
    };

    console.log(`Fetched player details for Player ID "${playerId}" from API.`);

    // Save to local DB
    try {
      await Player.create(detailedPlayer);
      console.log(`Player ID "${playerId}" saved to local DB.`);
    } catch (err) {
      if (err.code === 11000) {
        console.warn(`Player ID "${playerId}" already exists in the database.`);
      } else {
        console.error("Error inserting player into DB:", err.message);
      }
    }

    res.json({ status: "success", response: detailedPlayer });
  } catch (error) {
    console.error("Error in getPlayerDetails:", error.message);
    if (
      error.message.includes("404") ||
      error.message.toLowerCase().includes("not found")
    ) {
      res.status(404).json({ error: "Player not found" });
    } else {
      res.status(500).json({ error: error.message });
    }
  }
};
Ensure that:

All potential errors are caught and a meaningful error message is sent to the frontend.
The response structure matches what your frontend expects.
d. Frontend Error Handling:
Ensure that your frontend gracefully handles backend errors.

Example in PlayerPage.tsx:


// app/players/[id]/page.tsx

// ... (Imports remain the same)

const PlayerPage: React.FC = () => {
  // ... (State and useEffect remain the same)

  if (loading) {
    return (
      <>
        <Navbar />
        <div className="flex justify-center items-center h-screen">
          <p className="text-xl">Loading player details...</p>
        </div>
      </>
    );
  }

  if (error || !player) {
    return (
      <>
        <Navbar />
        <div className="flex flex-col justify-center items-center h-screen">
          <p className="text-xl text-red-500">{error || 'Player not found.'}</p>
          <Link href="/" className="mt-4 text-blue-500 underline">
            Go Back Home
          </Link>
        </div>
      </>
    );
  }

  // ... (Rest of the component)
};

export default PlayerPage;
10. Summary of Steps to Resolve the Error
Remove Nested <a> Tags:
In all instances of <Link>, ensure that there's no nested <a>. Apply className and other props directly to <Link>.
Update Navbar.tsx and PlayerSearch.tsx Appropriately:
Use the updated code samples provided above.
Ensure that <Card> components do not render as <a> tags internally.
Configure External Image Domains:
Update next.config.js to use images.remotePatterns instead of the deprecated images.domains.
Restart the development server after making changes.
Test Backend API Endpoints:
Use tools like Postman or cURL to ensure that all backend routes are functioning correctly and returning the expected data.
Inspect Backend Logs:
Look for any errors in your backend server's logs when accessing /players/[id] routes.
Leverage ESLint for Future Prevention:
Configure ESLint with the Next.js plugin to catch such issues during development.
11. Final Corrected PlayerSearch.tsx Code
Here's the fully corrected PlayerSearch.tsx component based on the above recommendations:


// component/PlayerSearch.tsx
'use client';

import { useState } from 'react';
import {
  Card,
  CardContent,
  CardHeader,
  CardTitle,
} from "@/components/ui/card";
import { Input } from "@/components/ui/input";
import { Button } from "@/components/ui/button";
import { Avatar, AvatarFallback } from "@/components/ui/avatar";
import { useRouter } from 'next/navigation';
import { Player } from '../types';
import { searchPlayers } from '../utils/api';
import { toast } from 'react-toastify';
import Link from 'next/link';
import Image from 'next/image';

const PlayerSearch: React.FC = () => {
  const [searchTerm, setSearchTerm] = useState('');
  const [players, setPlayers] = useState<Player[]>([]);
  const [loading, setLoading] = useState(false);
  const router = useRouter();

  const handleSearch = async () => {
    if (!searchTerm.trim()) {
      toast.error("Please enter a search term.");
      setPlayers([]);
      return;
    }

    setLoading(true);
    setPlayers([]);

    try {
      const data = await searchPlayers(searchTerm);
      setPlayers(data);
      if (data.length === 0) {
        toast.info("No players found. Try a different search.");
      }
    } catch (error: any) {
      toast.error(error.message || 'Error searching players.');
    } finally {
      setLoading(false);
    }
  };

  const handleKeyPress = (e: React.KeyboardEvent) => {
    if (e.key === 'Enter') {
      handleSearch();
    }
  };

  return (
    <div className="p-4">
      <Card>
        <CardHeader>
          <CardTitle>Player Search</CardTitle>
        </CardHeader>
        <CardContent>
          {/* Search Input and Button */}
          <div className="flex items-center space-x-2">
            <Input
              type="text"
              placeholder="Search players..."
              value={searchTerm}
              onChange={(e) => setSearchTerm(e.target.value)}
              onKeyPress={handleKeyPress}
            />
            <Button onClick={handleSearch} disabled={loading}>
              {loading ? 'Searching...' : 'Search'}
            </Button>
          </div>

          {/* Players Grid */}
          <div className="mt-4 grid grid-cols-1 sm:grid-cols-2 md:grid-cols-3 lg:grid-cols-4 gap-4">
            {players.map(player => (
              <Link
                href={`/players/${player.player_id}`}
                key={player.player_id}
                className="cursor-pointer hover:shadow-lg transition-shadow block"
              >
                <Card className="h-full">
                  <CardContent className="flex flex-col items-center">
                    <Avatar className="h-24 w-24 mb-2 relative">
                      {player.photo_url ? (
                        <Image 
                          src={player.photo_url} 
                          alt={player.name} 
                          fill
                          className="rounded-full object-cover" 
                        />
                      ) : (
                        <AvatarFallback>{player.name.charAt(0)}</AvatarFallback>
                      )}
                    </Avatar>
                    <h3 className="text-lg font-semibold">{player.name}</h3>
                    <p className="text-sm text-gray-500">{player.position} - {player.team}</p>
                  </CardContent>
                </Card>
              </Link>
            ))}
          </div>
        </CardContent>
      </Card>
    </div>
  );
};

export default PlayerSearch;
Explanation of Final Corrections:
Removed passHref:
It's no longer needed in Next.js 13+ as <Link> handles the href automatically.
Added className Directly to <Link>:
Applied cursor and hover styles to make the entire card interactive without nesting <a>.
Ensured <Card> Does Not Render as <a>:
Confirmed that <Card> is a <div> or similar element that doesn't render as an <a>. If it does, adjust the component accordingly.
Used block Class on <Link>:
Ensures that the entire <Card> is clickable and occupies the full block area.
Used relative Positioning on <Avatar>:
Necessary for the <Image> component with fill to position correctly within the <Avatar>.
Handled Missing Images Gracefully:
Provided a fallback using <AvatarFallback> when player.photo_url is unavailable.
12. Final Testing Steps
Restart Development Servers:
Ensure both your Next.js frontend and Express backend servers are running without errors.

# For Next.js
npm run dev
# or
yarn dev

# For Express (if separate)
node server.js
# or
npm run start
Navigate to Player Search Page:
Visit /players/search.
Perform a search for a player (e.g., "Messi").
Verify Player Cards:
Ensure that player cards display correctly with images (or fallbacks).
Hover over cards to see shadow effects.
Click on a Player Card:
Navigate to /players/[id] by clicking on a player.
Ensure that the player's details are displayed correctly.
Check that there are no runtime errors in the console.
Check Backend API Responses:
If navigation leads to a 500 error, check backend logs for specific error messages.
Ensure that the player ID exists and the API returns the correct data.
Verify Image Loading:
Ensure that external images load correctly based on next.config.js settings.
Inspect Rendered HTML:
Use browser developer tools to inspect the rendered HTML and ensure no invalid nesting exists.
Conclusion
By meticulously removing all nested <a> tags within <Link> components and ensuring that your components render semantically correct HTML, you should resolve the Invalid <Link> with <a> child error. Additionally, verifying backend API functionality and configuring external image domains properly will ensure a smooth user experience.

Remember:

Never nest <a> tags within <Link> components in Next.js 13+
Pass styling props directly to <Link>
Ensure that custom components like <Card> do not render as <a> tags
Configure external image domains using remotePatterns in next.config.js
If you've followed all the above steps and still encounter issues, consider sharing specific backend error logs, which can provide more insights into the 500 Internal Server Error. This will help in diagnosing and resolving backend-related problems.

Feel free to reach out with further questions or if you need more assistance!


So this is giving me player
Now what I want is that
// /app/components/LeagueSelector.tsx
'use client'

import { useState, useEffect } from 'react'
import { Card, CardContent, CardHeader, CardTitle } from "@/components/ui/card"
import { Skeleton } from "@/components/ui/skeleton"
import { Alert, AlertDescription, AlertTitle } from "@/components/ui/alert"
import { AlertCircle } from 'lucide-react'
import Link from 'next/link'
import Image from 'next/image'

interface League {
id: number
name: string
code: string
type: string
emblem: string
area: {
id: number
name: string
code: string
flag: string | null
}
}

interface LeaguesResponse {
count: number
leagues: League[]
}

export default function LeagueSelector() {
const [leagues, setLeagues] = useState<League[]>([])
const [isLoading, setIsLoading] = useState(true)
const [error, setError] = useState<string | null>(null)

useEffect(() => {
const fetchLeagues = async () => {
try {
const response = await fetch('http://localhost:5000/api/leagues') // Use absolute URL
if (!response.ok) {
throw new Error('Failed to fetch leagues')
}
const data: LeaguesResponse = await response.json()
setLeagues(data.leagues)
} catch (error) {
console.error('Error fetching leagues:', error)
setError('Failed to load leagues. Please try again later.')
} finally {
setIsLoading(false)
}
}


fetchLeagues()
}, [])

if (isLoading) {
return
}

if (error) {
return (


Error
{error}

)
}

return (


{leagues.map((league) => (
<Link
href={/league?code=${encodeURIComponent(league.code)}} // Pass code as query parameter
key={league.code}
className="focus:outline-none focus:ring-2 focus:ring-blue-500 rounded-lg"
>



<Image
src={league.emblem}
alt={${league.name} emblem}
width={48}
height={48}
className="rounded-full object-contain"
onError={(e) => {
const target = e.target as HTMLImageElement
target.src = '/placeholder.svg'
}}
/>

{league.name}


{league.area.name}


{league.type}





))}

)
}
function LeagueSkeleton() {
return (


{[...Array(6)].map((_, index) => (










))}

)
}
This is leagueSelector.tsx
'use client'
import React, { useState, useEffect } from 'react'
import { useParams } from 'next/navigation'
import Image from 'next/image'
import { Card, CardContent, CardHeader, CardTitle } from "@/components/ui/card"
import { Skeleton } from "@/components/ui/skeleton"
import { Alert, AlertDescription, AlertTitle } from "@/components/ui/alert"
import { AlertCircle } from 'lucide-react'

// ... Interfaces ...

export default function LeaguePage() {
const { leagueId } = useParams()
const [leagueData, setLeagueData] = useState<LeagueData | null>(null)
const [isLoading, setIsLoading] = useState(true)
const [error, setError] = useState<string | null>(null)

useEffect(() => {
const fetchLeagueData = async () => {
try {
const response = await fetch(http://localhost:5000/api/league/${leagueId})
// ... Rest of Error Handling ...
} catch (error) {
// ... Error Handling ...
} finally {
setIsLoading(false)
}
}


if (leagueId) {
  fetchLeagueData()
}
}, [leagueId])

// ... Render Loading, Error, and Data ...
}
// /app/league/page.tsx
'use client'

import React, { useState, useEffect } from 'react'
import { useSearchParams } from 'next/navigation'
import Image from 'next/image'
import {
Card,
CardContent,
CardHeader,
CardTitle,
} from "@/components/ui/card"
import { Skeleton } from "@/components/ui/skeleton"
import { Alert, AlertDescription, AlertTitle } from "@/components/ui/alert"
import { AlertCircle } from 'lucide-react'
import {
Table,
TableBody,
TableCell,
TableHead,
TableHeader,
TableRow,
} from "@/components/ui/table"
import { Button } from "@/components/ui/button"

interface Team {
id: number
name: string
shortName: string
tla: string
crest: string
venue: string
website: string
founded: number
clubColors: string
}

interface League {
id: number
name: string
code: string
type: string
emblem: string
area: {
id: number
name: string
code: string
flag: string
}
currentSeason: {
id: number
startDate: string
endDate: string
currentMatchday: number
winner: null | string
}
}

interface Standing {
position: number
team: {
id: number
name: string
shortName: string
tla: string
crest: string
}
playedGames: number
won: number
draw: number
lost: number
points: number
goalsFor: number
goalsAgainst: number
goalDifference: number
}

interface TopScorer {
player: {
id: number
name: string
firstName: string
lastName: string | null
dateOfBirth: string
nationality: string
position: string
shirtNumber: number | null
lastUpdated: string
}
team: {
id: number
name: string
shortName: string
tla: string
crest: string
address: string
website: string
founded: number
clubColors: string
venue: string
lastUpdated: string
}
goals: number
assists: number
penalties: number
}

interface LeagueData {
league: League
teams: Team[]
standings: Standing[]
topScorers: TopScorer[]
}

export default function LeaguePage() {
const searchParams = useSearchParams()
const code = searchParams.get('code')?.toUpperCase() // Get 'code' from query parameters and ensure it's uppercase
const [leagueData, setLeagueData] = useState<LeagueData | null>(null)
const [isLoading, setIsLoading] = useState(true)
const [error, setError] = useState<string | null>(null)
const [activeTab, setActiveTab] = useState<'Teams' | 'Standings' | 'Top Scorers'>('Teams')

useEffect(() => {
const fetchLeagueData = async () => {
try {
if (!code) {
throw new Error('No league code provided')
}
const response = await fetch(${process.env.NEXT_PUBLIC_API_BASE_URL}/league/${code}) // Use environment variable
if (!response.ok) {
if (response.status === 404) {
throw new Error('League not found')
}
throw new Error('Failed to fetch league data')
}
const data: LeagueData = await response.json()
setLeagueData(data)
} catch (error) {
console.error('Error fetching league data:', error)
setError(error instanceof Error ? error.message : 'An error occurred')
} finally {
setIsLoading(false)
}
}


if (code) {
  fetchLeagueData()
} else {
  setIsLoading(false)
  setError('No league code provided')
}
}, [code])

if (isLoading) {
return
}

if (error) {
return (


Error
{error}

)
}

if (!leagueData) {
return (


Not Found
League not found

)
}

const { league, teams, standings, topScorers } = leagueData

return (


{/* League Information Card */}



<Image
src={league.emblem}
alt={${league.name} emblem}
width={64}
height={64}
className="rounded-full object-contain"
onError={(e) => {
const target = e.target as HTMLImageElement
target.src = '/placeholder.svg'
}}
/>


{league.name}
{league.area.name}





Current Season: {league.currentSeason.startDate} to {league.currentSeason.endDate}


Current Matchday: {league.currentSeason.currentMatchday}




  {/* Tabs Navigation */}
  <div className="mb-6 flex space-x-4" role="tablist" aria-label="League Data Tabs">
    <Button
      variant={activeTab === 'Teams' ? 'default' : 'outline'}
      onClick={() => setActiveTab('Teams')}
      aria-selected={activeTab === 'Teams'}
      role="tab"
    >
      Teams
    </Button>
    <Button
      variant={activeTab === 'Standings' ? 'default' : 'outline'}
      onClick={() => setActiveTab('Standings')}
      aria-selected={activeTab === 'Standings'}
      role="tab"
    >
      Standings
    </Button>
    <Button
      variant={activeTab === 'Top Scorers' ? 'default' : 'outline'}
      onClick={() => setActiveTab('Top Scorers')}
      aria-selected={activeTab === 'Top Scorers'}
      role="tab"
    >
      Top Scorers
    </Button>
  </div>

  {/* Conditional Rendering Based on Active Tab */}
  {activeTab === 'Teams' && (
    <>
      <h2 className="text-2xl font-bold mb-4">Teams</h2>
      <div className="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-3 gap-4">
        {teams.map((team) => (
          <Card key={team.id} className="shadow-md">
            <CardHeader className="flex flex-row items-center space-x-4">
              <div className="relative w-12 h-12">
                <Image
                  src={team.crest}
                  alt={`${team.name} crest`}
                  width={48}
                  height={48}
                  className="rounded-full object-contain"
                  onError={(e) => {
                    const target = e.target as HTMLImageElement
                    target.src = '/placeholder.svg'
                  }}
                />
              </div>
              <CardTitle className="text-lg">{team.name}</CardTitle>
            </CardHeader>
            <CardContent>
              <p><strong>Venue:</strong> {team.venue}</p>
              <p><strong>Founded:</strong> {team.founded}</p>
              <p><strong>Club Colors:</strong> {team.clubColors}</p>
            </CardContent>
          </Card>
        ))}
      </div>
    </>
  )}

  {activeTab === 'Standings' && (
    <>
      <h2 className="text-2xl font-bold mb-4">Standings</h2>
      <div className="overflow-x-auto">
        <Table className="min-w-full">
          <TableHeader>
            <TableRow>
              <TableHead className="px-6 py-3">Pos</TableHead>
              <TableHead className="px-6 py-3">Team</TableHead>
              <TableHead className="px-6 py-3">P</TableHead>
              <TableHead className="px-6 py-3">W</TableHead>
              <TableHead className="px-6 py-3">D</TableHead>
              <TableHead className="px-6 py-3">L</TableHead>
              <TableHead className="px-6 py-3">GF</TableHead>
              <TableHead className="px-6 py-3">GA</TableHead>
              <TableHead className="px-6 py-3">GD</TableHead>
              <TableHead className="px-6 py-3">Pts</TableHead>
            </TableRow>
          </TableHeader>
          <TableBody>
            {standings.map((standing) => (
              <TableRow key={standing.position}>
                <TableCell className="px-6 py-4">{standing.position}</TableCell>
                <TableCell className="px-6 py-4 flex items-center space-x-2">
                  <Image
                    src={standing.team.crest}
                    alt={`${standing.team.name} crest`}
                    width={24}
                    height={24}
                    className="rounded-full object-contain"
                    onError={(e) => {
                      const target = e.target as HTMLImageElement
                      target.src = '/placeholder.svg'
                    }}
                  />
                  <span>{standing.team.name}</span>
                </TableCell>
                <TableCell className="px-6 py-4">{standing.playedGames}</TableCell>
                <TableCell className="px-6 py-4">{standing.won}</TableCell>
                <TableCell className="px-6 py-4">{standing.draw}</TableCell>
                <TableCell className="px-6 py-4">{standing.lost}</TableCell>
                <TableCell className="px-6 py-4">{standing.goalsFor}</TableCell>
                <TableCell className="px-6 py-4">{standing.goalsAgainst}</TableCell>
                <TableCell className="px-6 py-4">{standing.goalDifference}</TableCell>
                <TableCell className="px-6 py-4">{standing.points}</TableCell>
              </TableRow>
            ))}
          </TableBody>
        </Table>
      </div>
    </>
  )}

  {activeTab === 'Top Scorers' && (
    <>
      <h2 className="text-2xl font-bold mb-4">Top Scorers</h2>
      <div className="overflow-x-auto">
        <Table className="min-w-full">
          <TableHeader>
            <TableRow>
              <TableHead className="px-6 py-3">#</TableHead>
              <TableHead className="px-6 py-3">Player</TableHead>
              <TableHead className="px-6 py-3">Team</TableHead>
              <TableHead className="px-6 py-3">Goals</TableHead>
              <TableHead className="px-6 py-3">Assists</TableHead>
              <TableHead className="px-6 py-3">Penalties</TableHead>
            </TableRow>
          </TableHeader>
          <TableBody>
            {topScorers.map((scorer, index) => (
              <TableRow key={scorer.player.id}>
                <TableCell className="px-6 py-4">{index + 1}</TableCell>
                <TableCell className="px-6 py-4 flex items-center space-x-2">
                  <Image
                    src={scorer.team.crest}
                    alt={`${scorer.team.name} crest`}
                    width={24}
                    height={24}
                    className="rounded-full object-contain"
                    onError={(e) => {
                      const target = e.target as HTMLImageElement
                      target.src = '/placeholder.svg'
                    }}
                  />
                  <span>{scorer.player.name}</span>
                </TableCell>
                <TableCell className="px-6 py-4">{scorer.team.name}</TableCell>
                <TableCell className="px-6 py-4">{scorer.goals}</TableCell>
                <TableCell className="px-6 py-4">{scorer.assists}</TableCell>
                <TableCell className="px-6 py-4">{scorer.penalties}</TableCell>
              </TableRow>
            ))}
          </TableBody>
        </Table>
      </div>
    </>
  )}
</div>
)
}

function LeagueSkeleton() {
return (


{/* League Information Skeleton */}













  {/* Tabs Skeleton */}
  <div className="mb-6 flex space-x-4">
    <Skeleton className="h-10 w-24 rounded" />
    <Skeleton className="h-10 w-24 rounded" />
    <Skeleton className="h-10 w-24 rounded" />
  </div>

  {/* Content Skeleton */}
  <Skeleton className="h-8 w-40 mb-4" />
  <div className="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-3 gap-4">
    {[...Array(6)].map((_, index) => (
      <Card key={index}>
        <CardHeader className="flex flex-row items-center space-x-4">
          <Skeleton className="w-12 h-12 rounded-full" />
          <Skeleton className="h-6 w-32" />
        </CardHeader>
        <CardContent>
          <Skeleton className="h-4 w-full mb-2" />
          <Skeleton className="h-4 w-3/4 mb-2" />
          <Skeleton className="h-4 w-1/2" />
        </CardContent>
      </Card>
    ))}
  </div>
</div>
)
}
This is app/league/page.tsx
Which is returning top scorers
Now I want from previous playerSearch And this on clicking
like haaland in top scorer it get me on the haaland page same as it returned from searching and on clicking??
And one thing is that this leagueSelector or leaguePage . I'm fetching from different api in backend so player id must be different than playerSearch one