base64url 
Converting to, and from, base64url
Install
$ npm install base64url
After installing with npm you can require this library from JavaScript or TypeScript:
JavaScript
const base64url = require('base64url');
TypeScript:
import base64url from "base64url";
Usage
CLI
The CLI has been removed. For the time being, please install base64url@1.0.6 if you need the CLI.
Library
base64url(input: string | Buffer, encoding: string = "utf8"): string
base64url.encode(input: string | Buffer, encoding: string = "utf8"): string
base64url encode input. Input should be a string or a Buffer.
Example
> base64url("ladies and gentlemen we are floating in space")
'bGFkaWVzIGFuZCBnZW50bGVtYW4sIHdlIGFyZSBmbG9hdGluZyBpbiBzcGFjZQ'
base64url.decode(input: string, encoding: string = "utf8"): string
Convert a base64url encoded string into a raw string. The encoding argument can be used if the input is a string that's not utf8.
> base64url.decode("cmlkZTogZHJlYW1zIGJ1cm4gZG93bg")
'ride: dreams burn down'
base64url.fromBase64(input: string): string
Convert a base64 encoded string to a base64url encoded string.
Example
> base64url.fromBase64('qL8R4QIcQ/ZsRqOAbeRfcZhilN/MksRtDaErMA==')
'qL8R4QIcQ_ZsRqOAbeRfcZhilN_MksRtDaErMA'
base64url.toBase64(input: string): string
Convert a base64url encoded string to a base64 encoded string.
> base64url.toBase64('qL8R4QIcQ_ZsRqOAbeRfcZhilN_MksRtDaErMA')
'qL8R4QIcQ/ZsRqOAbeRfcZhilN/MksRtDaErMA=='
base64url.toBuffer(input: string): Buffer
Convert a base64url encoded string to a Buffer containing the decoded bytes.
> base64url.toBuffer('c3Bpcml0dWFsaXplZA')
<Buffer 73 70 69 72 69 74 75 61 6c 69 7a 65 64>
Alternatives
Supported Node.js versions
This library should be used with current versions of the Node.js runtime's long-term stable (LTS) schedule. More information can be found at the Node.js Release Working Group repo.
License
MIT
Copyright (c) 2013–2016 Brian J. Brennan
Permission is hereby granted, free of charge, to any person obtaining a
copy of this software and associated documentation files (the
"Software"), to deal in the Software without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Software, and to
permit persons to whom the Software is furnished to do so, subject to
the following conditions:
The above copyright notice and this permission notice shall be included
in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.