Buffer nodejs to arraybuffer code example

Example 1: nodejs array buffer to buffer

"From ArrayBuffer to Buffer" could be done this way:

var buffer = Buffer.from( new Uint8Array(ab) );

Example 2: js string to arraybuffer

if (!("TextEncoder" in window)) 
  alert("Sorry, this browser does not support TextEncoder...");

var enc = new TextEncoder(); // always utf-8
console.log(enc.encode("This is a string converted to a Uint8Array"));