1> console.log(Buffer.from("Hello World").toString('base64'));
2SGVsbG8gV29ybGQ=
3> console.log(Buffer.from("SGVsbG8gV29ybGQ=", 'base64').toString('ascii'))
4Hello World

1var string = "Hello folks how are you doing today?";
2var encodedString = btoa(string); // Base64 encode the String
3var decodedString = atob(encodedString); // Base64 decode the String
4

1// base64 to string
2let base64ToString = Buffer.from(obj, "base64").toString();
3base64ToString = JSON.parse(base64ToString);
4
5//or
6let str = 'bmltZXNoZGV1amEuY29t';
7let buff = new Buffer(str, 'base64');
8let base64ToStringNew = buff.toString('ascii');
9
10// string to base64
11let data = 'nimeshdeuja.com';
12let buff = new Buffer(data);
13let stringToBase64 = buff.toString('base64');

1// Define the string
2var string = 'Hello World!';
3
4// Encode the String
5var encodedString = btoa(string);
6console.log(encodedString); // Outputs: "SGVsbG8gV29ybGQh"
7
8// Decode the String
9var decodedString = atob(encodedString);
10console.log(decodedString); // Outputs: "Hello World!"
11

1const encoded = window.btoa('Alireza Dezfoolian'); // encode a string
2const decoded = window.atob(encoded); // decode the string
3

1var decodedString = atob(encodedString);