How can I decode a base64 string in Javascript? • GITNUX

#How can I decode a base64 string in Javascript? • GITNUX| 来源: 网络整理| 查看: 265

Decoding a base64 string in JavaScript is easy with the `atob()` function. This function takes a base64 encoded string as input and returns the decoded string. However, this function is not supported in Node.js; instead, you can use the `Buffer` class to decode it there. In this post we will look at how to do both of these tasks using examples for each case.

Programming Guide

You can decode a base64 string in JavaScript using the `atob()` function. Here’s an example:

// Your base64 encoded string var base64String = "SGVsbG8sIFdvcmxkIQ=="; // Decode the base64 string var decodedString = atob(base64String); console.log(decodedString); // Outputs: "Hello, World."

`atob()` takes a base64 encoded string as input and returns the decoded string. Note that this function is not supported in Node.js, only in browsers. If you need to do this in Node.js, you can use the `Buffer` class:

// Your base64 encoded string var base64String = "SGVsbG8sIFdvcmxkIQ=="; // Decode the base64 string in Node.js var decodedString = Buffer.from(base64String, 'base64').toString('utf-8'); console.log(decodedString); // Outputs: "Hello, World."

In this case, `Buffer.from()` creates a new Buffer from the base64 encoded string, and `toString(‘utf-8’)` converts the Buffer to a readable UTF-8 string.

Conclusion

The `atob()` function can be used to decode a base64 encoded string in JavaScript. It is not supported in Node.js, but the `Buffer` class can be used instead for decoding strings in this environment.

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