Shorter UUIDs

short-uuid.js

const bigInt = require("big-integer")
const symbols = `0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ`;

const v2r = (n, b) => {
  if(!bigInt.isInstance(n)) n = bigInt(n);
  let digits = '';
  while(n > 0){
    let r = n.divmod(b);
    digits = symbols[r.remainder] + digits;
    n  = r.quotient;
  }
  return digits;
}
const r2v = (digits, b) => {
  let n = bigInt();
  for(let d of digits){
    if(symbols.substr(0, b).indexOf(d) === -1){
      throw new Error(`Digit '${d}' not found in digits ${base_symbols.substr(0, b)}`);
    }
    n = n.times(b).add(symbols.indexOf(d));
  }
  return n;
}

const b2b = (digits, b1, b2) => {
  return v2r(r2v(digits, b1), b2);
}

const toShort = (value) => {
    value = value.replace(/-/g, '').toLowerCase();
    let base = symbols.length;
    return b2b(value, 16, base);
}

const fromShort = (value) => {
    let base = symbols.length;
    let result = b2b(value, base, 16);
    return result.replace(/^([a-f0-9]{8})([a-f0-9]{4})([a-f0-9]{4})([a-f0-9]{4})([a-f0-9]{12})$/, '$1-$2-$3-$4-$5');
}

// Example
  
const arr = [
  '3763672ba658491f9ad267aa1ff337cd',
  'f891380f-9db7-4c03-a13e-2063a83272c3',
  'FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF'
].forEach((uuid)=>{
  let short = toShort(uuid);
  let long = fromShort(short);
  console.log(`${uuid} >> ${short} >> ${long}`);
});