How to convert String into Hex nodejs

Question

I was looking for some standard function like hex to string but inverse, I want to convert String to Hex, but I only found this function...

// Example of convert hex to String
hex.toString('utf-8')

Answer 1

In NodeJS, use Buffer to convert string to hex.

Buffer.from('hello world', 'utf8').toString('hex');

Simple example about how it works:

const bufferText = Buffer.from('hello world', 'utf8'); // or Buffer.from('hello world')
console.log(bufferText); // <Buffer 68 65 6c 6c 6f 20 77 6f 72 6c 64>

const text = bufferText.toString('hex');
// To get hex
console.log(text); // 68656c6c6f20776f726c64

console.log(bufferText.toString()); // or toString('utf8')
// hello world

//one single line
Buffer.from('hello world').toString('hex')

Answer 2

You can use function like the below:

  function stringToHex(str) {

  //converting string into buffer
   let bufStr = Buffer.from(str, 'utf8');

  //with buffer, you can convert it into hex with following code
   return bufStr.toString('hex');

   }

 stringToHex('some string here'); 

Answer 3

NPM amrhextotext, simple converter text to hex and hex to text

Install

npm i amrhextotext

Usange:

const text = 'test text'
const hex = '746573742074657874'

const convert = require('amrhextotext')

//convert text to hex
let hexSample = convert.textToHex(text)
//Result: 746573742074657874

//Convert hex to text
let textSample = convert.hexToUtf8(hex)
//Result: test text

note: Source from page

Answer 4

If you want a pretty hex string of numbers plotted with 0x prefix :

export function toHexString(value: Buffer | number[]): string {
  if(!value) return null;
  if(typeof value == "object") value = Buffer.from(value);
  return value.toString('hex').match(/.{1,2}/g).map(val => `0x${val}`).join(", ");
}