Decode Base64 Javascript Online with Our Free Tool

Below is a list of libraries that support Base64 encoding and decoding in JavaScript along with sample code for each library.

1. JavaScript Standard Library

JavaScript provides the btoa and atob functions for Base64 encoding and decoding in the browser environment.

<script>
const originalString = "test input";

// Encode
const encodedString = btoa(originalString);
console.log("Encoded: " + encodedString);

// Decode
const decodedString = atob(encodedString);
console.log("Decoded: " + decodedString);
</script>

    

2. Node.js Buffer

Node.js provides the Buffer class which supports Base64 encoding and decoding.

const originalString = "test input";

// Encode
const encodedString = Buffer.from(originalString).toString('base64');
console.log("Encoded: " + encodedString);

// Decode
const decodedString = Buffer.from(encodedString, 'base64').toString('utf-8');
console.log("Decoded: " + decodedString);

    

3. js-base64

The js-base64 library provides utilities for Base64 encoding and decoding in both browser and Node.js environments.

<script src="https://cdn.jsdelivr.net/npm/js-base64/base64.min.js"></script>
<script>
const originalString = "test input";

// Encode
const encodedString = Base64.encode(originalString);
console.log("Encoded: " + encodedString);

// Decode
const decodedString = Base64.decode(encodedString);
console.log("Decoded: " + decodedString);
</script>

    

In Node.js:

const { Base64 } = require('js-base64');

const originalString = "test input";

// Encode
const encodedString = Base64.encode(originalString);
console.log("Encoded: " + encodedString);

// Decode
const decodedString = Base64.decode(encodedString);
console.log("Decoded: " + decodedString);

    

Add the dependency using npm:

npm install js-base64
    

4. CryptoJS

CryptoJS is a widely-used cryptographic library that also supports Base64 encoding and decoding.

<script src="https://cdn.jsdelivr.net/npm/[email protected]/crypto-js.js"></script>
<script>
const originalString = "test input";

// Encode
const encodedString = CryptoJS.enc.Base64.stringify(CryptoJS.enc.Utf8.parse(originalString));
console.log("Encoded: " + encodedString);

// Decode
const decodedString = CryptoJS.enc.Base64.parse(encodedString).toString(CryptoJS.enc.Utf8);
console.log("Decoded: " + decodedString);
</script>

    

5. Buffer in React Native

In React Native, you can use the Buffer class from the buffer library for Base64 encoding and decoding.

import { Buffer } from 'buffer';

const originalString = "test input";

// Encode
const encodedString = Buffer.from(originalString).toString('base64');
console.log("Encoded: " + encodedString);

// Decode
const decodedString = Buffer.from(encodedString, 'base64').toString('utf-8');
console.log("Decoded: " + decodedString);

    

Add the dependency using npm:

npm install buffer
    

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Why Use Base64 Encoding?

Base64 encoding is a method of converting binary data into a text format using 64 characters. This encoding scheme is especially useful when you need to transfer or store data over media designed to handle text, such as email or JSON files. Base64 ensures your data remains intact and unmodified during transport.

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Example of Base64 Decoding

Here’s a quick example. Decoding the Base64 string "SGVsbG8sIFdvcmxkIQ==" yields:

Hello, World!

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