How to get download link of uploaded files in firebase storage in ReactJS? - GeeksforGeeks

26 May, 2021
The following approach covers how to get download links of files in firebase storage using react. We have used the firebase module to achieve so.
Creating React Application And Installing Module:
Step 1: Create a React app using the following command:
npx create-react-app myapp
Step 2: After creating your project folder i.e. myapp, move to it using the following command:
cd myapp
Project structure: Our project structure will look like this.
Step 3: After creating the ReactJS application, Install the firebase module using the following command:
npm install firebase@8.3.1 --save
Step 4: Go to your firebase dashboard and create a new project and copy your credentials.
const firebaseConfig = {
      apiKey: "your api key",
      authDomain: "your credentials",
      projectId: "your credentials",
      storageBucket: "your credentials",
      messagingSenderId: "your credentials",
      appId: "your credentials"
};
Step 5: Initialize the Firebase into your project by creating a firebase.js file with the following code.
firebase.js
import firebase from 'firebase';  const firebaseConfig = {    // Your Credentials};  firebase.initializeApp(firebaseConfig);var storage = firebase.storage();  export default storage;
Step 6: Now go to your storage section in the firebase project and update your security rules. Here we are in testing mode, so we allow both read and write as true. After updating the code shown below. Click on publish. 
Step 7: Now implement the download link part.
Here, We are going to use a method called getDownloadUrl which helps us to get the download link of files in firebase storage.
App.js
import { useState } from 'react';import storage from './firebase';  function App() {    const [image, setImage] = useState('');  const [Url, setUrl] = useState('');    const upload = () => {    if (image == null)      return;    setUrl("Getting Download Link...")      // Sending File to Firebase Storage    storage.ref(`/images/${image.name}`).put(image)      .on("state_changed", alert("success"), alert, () => {          // Getting Download Link        storage.ref("images").child(image.name).getDownloadURL()          .then((url) => {            setUrl(url);          })      });  }    return (    <div className="App" style={{ marginTop: 250 }}>      <center>        <input type="file"         onChange={(e) => { setImage(e.target.files[0]) }} />        <button onClick={upload}>Upload</button>        <br />        <p><a href={Url}>{Url}</a></p>      </center>    </div>  );}  export default App;
Step to Run Application: Run the application using the following command from the root directory of the project:
npm start
Output: Now open your browser and go to http://localhost:3000/, you will see the following output:
Firebase
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ReactJS
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