create Random string from input in length of 8 char

random string.js

function getRandomIntInclusive (min, max) {
  min = Math.ceil(min)
  max = Math.floor(max)

  return Math.floor(Math.random() * (max - min + 1)) + min
}

async function codeGenerator (input) {
  const inputLengthLimit = 5

  let codeStarter = input.substring(0, inputLengthLimit).toLowerCase()

  if (codeStarter.length < inputLengthLimit) {
    const starterFillerCount = inputLengthLimit - codeStarter.length

    // fill the gap with random number incase input was les than limit of chars
    codeStarter += getRandomIntInclusive(
      +`1${'0'.repeat(starterFillerCount - 1)}`,
      +`9${'9'.repeat(starterFillerCount - 1)}`
    )
  }

  return `${codeStarter}${getRandomIntInclusive(100, 999)}`
}