Answers for "nodejs convert data to buffer"

nodejs create buffer from string

// a string
const str = "Hey. this is a string!";

// convert string to Buffer
const buff = Buffer.from(str, "utf-8");

console.log(buff); // <Buffer 48 65 79 2e ... 72 69 6e 67 21>

nodejs array buffer to buffer

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

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