Naan and Paneer Makhani

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    2.0.6 • Public • Published

    abab npm version Build Status

    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


    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.


    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');


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

    Remembering what atob and btoa stand for

    Base64 comes from IETF RFC 4648 (2006).

    • btoa, the encoder function, stands for binary to ASCII, meaning it converts any binary input into a subset of ASCII (Base64).
    • atob, the decoder function, converts ASCII (or Base64) to its original binary format.


    npm i abab

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