nodejs base64 decode code example

Example 1: nodejs string to base64

> console.log(Buffer.from("Hello World").toString('base64'));
SGVsbG8gV29ybGQ=
> console.log(Buffer.from("SGVsbG8gV29ybGQ=", 'base64').toString('ascii'))
Hello World

Example 2: javascript base64 encode

var string = "Hello folks how are you doing today?";
var encodedString = btoa(string); // Base64 encode the String
var decodedString = atob(encodedString); // Base64 decode the String

Example 3: Encoding and Decoding Base64 Strings in Node.js

'use strict';

let data = 'stackabuse.com';
let buff = new Buffer(data);
let base64data = buff.toString('base64');

console.log('"' + data + '" converted to Base64 is "' + base64data + '"');

Example 4: javascript base64url decode

var decode = function(input) {
        // Replace non-url compatible chars with base64 standard chars
        input = input
            .replace(/-/g, '+')
            .replace(/_/g, '/');

        // Pad out with standard base64 required padding characters
        var pad = input.length % 4;
        if(pad) {
          if(pad === 1) {
            throw new Error('InvalidLengthError: Input base64url string is the wrong length to determine padding');
          }
          input += new Array(5-pad).join('=');
        }

        return input;
    }