Fantom ID

A tiny, universal ID generator compatible with JavaScript integers. Built for generating evenly distributed database identifiers at high concurrency.

import fantomid from "fantomid";
fantomid(); //=> 8209108814378532

Fantom ID works by generating a timestamp of 36 bits and 17 random bits in reverse order.

Generating a timestamp ensures the IDs are distributed evenly across time, while the remaining bits of entropy allows different nodes to generate IDs at the exact same moment with a low chance of collision.

   ID: 8209108814378532                               Bit-reverse
                                                          ◄─┐
     Random bits                   Timestamp                │
 ┌─────────────────┐ ┌────────────────────────────────────┐ │
 │11101001010100010│ │010000010110110011011011011000100100│ │
 └─────────────────┘ └────────────────────────────────────┘

 └────A2 D2 FF─────┘ └──────2025-11-24T19:13:45.994Z──────┘

The result is a JavaScript-safe integer represented in bit-reverse order, which prevents hotspots by keeping the monotonic part of the ID last.

It works similarly to UUIDv7, but restrained to the size of JavaScript integers: 53 bits.