abab

What is abab?

The abab npm package is a utility that provides Base64 encoding and decoding as well as window.atob and window.btoa polyfills for Node.js. It is designed to mimic the behavior of these methods in the web browser environment.

What are abab's main functionalities?

Base64 Encoding

This feature allows you to encode a string to Base64. The provided code sample demonstrates how to encode the string 'Hello, World!' using the btoa function.

"use strict";
const abab = require('abab');
let encodedData = abab.btoa('Hello, World!');
console.log(encodedData); // Outputs: SGVsbG8sIFdvcmxkIQ==

Base64 Decoding

This feature allows you to decode a Base64 encoded string. The provided code sample demonstrates how to decode the string 'SGVsbG8sIFdvcmxkIQ==' using the atob function.

"use strict";
const abab = require('abab');
let decodedData = abab.atob('SGVsbG8sIFdvcmxkIQ==');
console.log(decodedData); // Outputs: Hello, World!

Other packages similar to abab

base-64

The base-64 package offers a robust and performant way to encode and decode Base64 strings in Node.js. It is similar to abab but focuses solely on Base64 encoding and decoding without trying to polyfill browser-specific APIs.

js-base64

js-base64 is another popular package for encoding and decoding Base64 strings. It works in both Node.js and browser environments and provides additional features such as Unicode support and URL-safe encoding/decoding. It is more feature-rich compared to abab.

README

abab

A JavaScript module that implements window.atob and window.btoa according the forgiving-base64 algorithm in the Infra Standard. The original code was forked from w3c/web-platform-tests.

Compatibility: Node.js version 3+ and all major browsers.

Install with npm:

npm install abab

API

btoa (base64 encode)

const { btoa } = require('abab');
btoa('Hello, world!'); // 'SGVsbG8sIHdvcmxkIQ=='

atob (base64 decode)

const { atob } = require('abab');
atob('SGVsbG8sIHdvcmxkIQ=='); // 'Hello, world!'

Valid characters

Per the spec, btoa will accept strings "containing only characters in the range U+0000 to U+00FF." If passed a string with characters above U+00FF, btoa will return null. If atob is passed a string that is not base64-valid, it will also return null. In both cases when null is returned, the spec calls for throwing a DOMException of type InvalidCharacterError.

Browsers

If you want to include just one of the methods to save bytes in your client-side code, you can require the desired module directly.

const atob = require('abab/lib/atob');
const btoa = require('abab/lib/btoa');

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Checklists

If you're submitting a PR or deploying to npm, please use the checklists in CONTRIBUTING.md

Remembering atob vs. btoa

Here's a mnemonic that might be useful: if you have a plain string and want to base64 encode it, then decode it, btoa is what you run before (before - btoa), and atob is what you run after (after - atob).