small-id.js

/**
 * Creates a short id from a string of numbers.
 * 
 * @param  {String} inputNumber The number to hash
 * @return {String} hash    The hashed string
 */
module.exports = (inputNumber) => {
  let hash = '';
  const alphabet = '23456789abcdefghijklmnopqrstuvwxyz';
  const length = alphabet.length;

  do {
    hash = alphabet[inputNumber % length] + hash;
    inputNumber = parseInt(inputNumber / length, 10);
  } while (inputNumber);
  return hash;
};

/* Usage And Expected Output: */
const generate = require('hash');

const id = generate('394540642987933707');

console.log(id) 
// => 7n62wxauu926

/* append Date.now() to make the id more unique */
   const input = '394540642987933707' + Date.now();
   const idWithDate = generate(input);
   console.log(idWithDate)
// => 7n63sv69jcce