js encode image data to ascii and back to Uint8Array

img-encode.js

const fs = require("fs");

let imageFile = fs.readFileSync('image.jpg', null).buffer
let imgArray = new Uint8Array(imageFile)

let text = ''
imgArray.forEach(n => {
  text += String.fromCharCode(n + 256)
})
console.table(imgArray, text, '\n')

let arr = []
for (let i = 0; i < text.length; i++) {
  arr[i] = text.charCodeAt(i) - 256
}
console.table(new Uint8Array(arr))