Hi, I've been trying to decode ULID into bytes for more efficient st

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Decoding ULID string into bytes about javascript HOT 2 CLOSED

ulid commented on July 17, 2024 1

Decoding ULID string into bytes

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Comments (2)

samal-rasmussen commented on July 17, 2024 1

01FZD39998855SS2YG4XP4T14P is a valid base32 encoded string and a base32 string should round trip between b32decode and b32encode to the same value. If it doesn't then there's a bug there. It has nothing to do with ulid.

I found a different encoding package crockford-base32 that isn't bugged:

import b32decode from 'base32-decode';
import b32encode from 'base32-encode';
import { CrockfordBase32 } from 'crockford-base32';

const uid = '01FZD39998855SS2YG4XP4T14P';

const buffer = CrockfordBase32.decode(uid);
console.log('decoded', new Uint8Array(buffer).toString());
const res = CrockfordBase32.encode(buffer);
console.log('encoded', res);

const decoded = b32decode(uid, 'Crockford');
console.log('DECODED', new Uint8Array(decoded).toString());
const encoded = b32encode(decoded, 'Crockford');
console.log('ENCODED', encoded);

Result:

decoded 1,127,218,52,165,40,65,75,156,139,208,39,108,77,4,150
encoded 01FZD39998855SS2YG4XP4T14P
DECODED 0,95,246,141,41,74,16,82,231,34,244,9,219,19,65,37
ENCODED 01FZD39998855SS2YG4XP4T14M

Run it on stackblitz:
https://stackblitz.com/edit/js-esmrfr

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