Demystifying IP Addresses with is.ipv4 and is.not_ipv4 from 'thiis': Your Friendly Guide to IP Validation
Tags: coding, security, typescript, javascript
Published: 2023-11-28 10:23:25

Welcome, fellow coders, to a fascinating exploration of IP addresses in JavaScript! Today, we'll unravel the secrets of validating IPv4 addresses using the `is.ipv4` method and its trusty companion, `is.not_ipv4`. Get ready for a journey into the world of networking and precision in your JavaScript applications.

## Understanding IPv4 Addresses

![Image description](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/r1lzeqfr1hqvsk4wc63l.jpeg)

Before we dive into the tools at hand, let's take a moment to demystify IPv4 addresses. These addresses are the numerical labels assigned to devices participating in a computer network that uses the Internet Protocol for communication. An IPv4 address consists of four numbers separated by periods, each ranging from 0 to 255.

## Meet `is.ipv4` - Your IPv4 Validator

[Documentation link](https://karbashevskyi.github.io/thiis/docs/API/String/is.ipv4)

Imagine you're working on a project that involves handling IP addresses, and you want to ensure that a given value is a valid IPv4 address. Enter the `is.ipv4` method, your trusty IPv4 validator. Let's see it in action:

```javascript
import { is } from 'thiis'; // Import the "is" object from the "thiis" package

const ipAddress = '192.168.0.1';
const result = is.ipv4(ipAddress);

console.log(result); // true
```

In this example, we import the "is" object from the "thiis" package and use the `is.ipv4` method to confirm that `ipAddress` is indeed a valid IPv4 address. As expected, it returns `true` because the value is a valid IPv4 address.

## The Grand Tour of Examples

Now, let's embark on a grand tour featuring six captivating examples that showcase the versatility of `is.ipv4` and its companion, `is.not_ipv4`. Buckle up for a mix of practical scenarios!

### 1. **Basic IPv4 Validation**

The primary role of `is.ipv4` is to validate IPv4 addresses. Use it to check if an address is in the correct format:

```javascript
import { is } from 'thiis';

const ipAddress = '192.168.0.1';

if (is.ipv4(ipAddress)) {
  // Proceed confidently with the valid IPv4 address.
} else {
  // Handle the case where the address is not valid.
}
```

### 2. **Guarding Against Non-IPv4 Values**

On the flip side, `is.not_ipv4` acts as your guardian against non-IPv4 values. Ensure that a value is not an IPv4 address before proceeding:

```javascript
import { is } from 'thiis';

const questionableValue = someFunctionThatMayReturnNonIPv4Value();

if (is.not_ipv4(questionableValue)) {
  // Your guardian prevents non-IPv4 mishaps!
} else {
  // Time to explore other possibilities.
}
```

### 3. **Form Validation with `is.ipv4`**

Imagine you're developing a form that requires an IPv4 address. Use `is.ipv4` to validate user input:

```javascript
import { is } from 'thiis';

function validateIpAddress(input) {
  if (is.ipv4(input)) {
    return 'IPv4 address validated successfully!';
  } else {
    return 'Please provide a valid IPv4 address.';
  }
}
```

### 4. **Handling IP Address Arrays**

Arrays are common in programming, and IP addresses can be part of them. Use `every()` with `is.ipv4` to ensure that all elements are valid IPv4 addresses:

```javascript
import { is } from 'thiis';

const ipAddresses = ['192.168.0.1', '10.0.0.2', '256.256.256.256'];

const allValid = ipAddresses.every(is.ipv4); // false

console.log(allValid);
```

In this example, `allValid` checks if all elements in `ipAddresses` are valid IPv4 addresses. In this case, it returns `false` because '256.256.256.256' is not a valid IPv4 address.

### 5. **Stream of IPv4 Addresses**

Let's spice things up with RxJS and `stream$`. Using `filter` and `is.ipv4`, we can ensure that the stream processes only valid IPv4 addresses:

```javascript
import { is } from 'thiis';
import { from } from 'rxjs';
import { filter } from 'rxjs/operators';

const ipStream$ = from(['192.168.0.1', 'not an IP', '10.0.0.2', 'invalid.address']);

ipStream$
  .pipe(
    filter(is.ipv4)
  )
  .subscribe(validIp => {
    console.log(validIp); // Only valid IPv4 addresses will be part of the stream's story.
  });
```

In this example, the `filter(is.ipv4)` ensures that only valid IPv4 addresses get processed by the stream.

### 6. **Mixing IPv4 and Non-IPv4 in an Array**

Arrays may contain a mix of IPv4 and non-IPv4 values. Use `some()` with `is.not_ipv4` to check if at least one element is not a valid IPv4 address:

```javascript
import { is } from 'thiis';

const mixedAddresses = ['192.168.0.1', 'not an IP', '10.0.0.2'];

const hasNonIPv4 = mixedAddresses.some(is.not_ipv4); // true

console.log(hasNonIPv4);
```

Here, `hasNonIPv4` checks if at least one element in `mixedAddresses` is not a valid IPv4 address, and it returns `true`.

### 7. Additional examples

```javascript
is.ipv4('192.168.1.1'); // true
is.ipv4('255.255.255.0'); // true
is.ipv4('10.0.0.1'); // true
is.ipv4('172.16.0.1'); // true

is.ipv4(`a`); // false
is.ipv4("r"); // false
is.ipv4('t'); // false
is.ipv4(`3`); // false
is.ipv4(`1`); // false
is.ipv4(`2`); // false
is.ipv4('hello'); // false
is.ipv4('hello123'); // false
is.ipv4('helloWorld'); // false
is.ipv4('a1B2c3d4e5f6g'); // false
is.ipv4('a1B2c3d4e5f6'); // false
is.ipv4('inCamelCase'); // false
is.ipv4('undefined'); // false
is.ipv4('null'); // false
is.ipv4(BigInt(1)) // false
is.ipv4(0) // false
is.ipv4(1) // false
is.ipv4(-1) // false
is.ipv4(Symbol()) // false
is.ipv4(null) // false
is.ipv4(true) // false
is.ipv4([]) // false
is.ipv4(false) // false
is.ipv4("") // false
is.ipv4('') // false
is.ipv4(``) // false
is.ipv4({}) // false
is.ipv4(undefined) // false
is.ipv4(Function) // false
is.ipv4(() => {}) // false
is.ipv4(BigInt) // false
is.ipv4(Symbol) // false
is.ipv4(NaN) // false
is.ipv4(Infinity) // false
is.ipv4(-Infinity) // false
is.ipv4(Number.POSITIVE_INFINITY) // false
is.ipv4(Number.NEGATIVE_INFINITY) // false
// And all other known types will return false
```

```javascript
is.not_ipv4('192.168.1.1'); // false
is.not_ipv4('255.255.255.0'); // false
is.not_ipv4('10.0.0.1'); // false
is.not_ipv4('172.16.0.1'); // false

is.not_ipv4(`a`); // true
is.not_ipv4("r"); // true
is.not_ipv4('t'); // true
is.not_ipv4(`3`); // true
is.not_ipv4(`1`); // true
is.not_ipv4(`2`); // true
is.not_ipv4('hello'); // true
is.not_ipv4('hello123'); // true
is.not_ipv4('helloWorld'); // true
is.not_ipv4('a1B2c3d4e5f6g'); // true
is.not_ipv4('a1B2c3d4e5f6'); // true
is.not_ipv4('inCamelCase'); // true
is.not_ipv4('undefined'); // true
is.not_ipv4('null'); // true
is.not_ipv4(BigInt(1)) // true
is.not_ipv4(0) // true
is.not_ipv4(1) // true
is.not_ipv4(-1) // true
is.not_ipv4(Symbol()) // true
is.not_ipv4(null) // true
is.not_ipv4(true) // true
is.not_ipv4([]) // true
is.not_ipv4(false) // true
is.not_ipv4("") // true
is.not_ipv4('') // true
is.not_ipv4(``) // true
is.not_ipv4({}) // true
is.not_ipv4(undefined) // true
is.not_ipv4(Function) // true
is.not_ipv4(() => {}) // true
is.not_ipv4(BigInt) // true
is.not_ipv4(Symbol) // true
is.not_ipv4(NaN) // true
is.not_ipv4(Infinity) // true
is.not_ipv4(-Infinity) // true
is.not_ipv4(Number.POSITIVE_INFINITY) // true
is.not_ipv4(Number.NEGATIVE_INFINITY) // true
// And all other known types will return true
```

## The Adventure's Conclusion

The `is.ipv4` and `is.not_ipv4` methods from the 'thiis' package are your companions on a thrilling journey into the realm of IPv4 validation in JavaScript. They bring precision to your networking tasks and ensure your code interacts with IPv4 addresses exactly as intended. By adding the 'thi

is' package to your JavaScript toolkit and exploring its documentation for more tips and examples, you can navigate the networking landscape with confidence and a dash of fun.

So, go forth and code with the assurance that your JavaScript applications are equipped to handle IPv4 addresses seamlessly! 

> 🎗 ChatGPT & DALL·E 3