Node.js by Example: Base64 Encoding

JavaScript has built-in support for base64 encoding & decoding.

Encoding a string.

 
const encodedData = btoa("Hello World");
console.log(encodedData);

Decoding a string

 
const decodedData = atob(encodedData);
console.log(decodedData);

We can also use a node.js buffer to encode/decode a string.

 
const bufferObj = Buffer.from("Howdy Friends", "utf8");
 
const base64String = bufferObj.toString("base64");
 
console.log(base64String);

Decoding from buffer works the same way.

 
const encodedBuffer = Buffer.from(base64String, "base64");
 
const decodedString = encodedBuffer.toString("utf8");
console.log(decodedString);
 
$ node base64-encoding.js
SGVsbG8gV29ybGQ=
Hello World
SG93ZHkgRnJpZW5kcw==
Howdy Friends

Next example: .

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