About The Project

Generates unique, time-sortable 64-bit bigint IDs for distributed systems.

Written with bun, works in node.js but with worse performance (~40ns / iter).

Features

• Unique: Generates 64-bit unique identifiers.
• Time-sortable: IDs are ordered by creation time.
• Distributed: Supports multiple workers and processes to ensure uniqueness across a cluster.
• High Performance: Generates up to 16,384 IDs per millisecond per node.
• Zero Dependencies: Lightweight and fast.

Getting Started

Installation

npm install @timondev/snowflakes
# or
yarn add @timondev/snowflakes
# or
pnpm add @timondev/snowflakes
# or
bun add @timondev/snowflakes

Usage

Basic Usage

import { Snowflake } from '@timondev/snowflakes';

// Generate a unique ID
const id = Snowflake.generate();
console.log(id); // e.g., 159958744000000000n

Configuration

Configure custom epoch, worker ID, and process ID for distributed environments.

import { Snowflake } from '@timondev/snowflakes';

Snowflake.configure({
  epoch: 1609459200000, // Custom epoch (e.g., Jan 1, 2021)
  workerId: 1n,         // Worker ID (0-15)
  processId: 2n         // Process ID (0-15)
});

const id = Snowflake.generate();

API

Snowflake.generate(): bigint

Generates a unique 64-bit ID.

• Returns: A bigint representing the unique ID.
• Throws: RangeError if the increment limit (16,384) is exceeded for the current millisecond.
• Throws: Error if the system clock moves backwards.

Snowflake.configure(options)

Configures the Snowflake generator.

Options:

• epoch (optional): Custom epoch timestamp (in milliseconds). Defaults to 1420070400000 (Twitter Snowflake epoch).
• workerId (optional): Worker identifier (0-15). Defaults to process.env.NODE_UNIQUE_ID or 0.
• processId (optional): Process identifier (0-15). Defaults to process.pid.

ID Structure

IDs consist of 3 components:

| Component | Bits | Description | | ------------------------ | ------- | -------------------------------------------------------------- | | Timestamp | 42 bits | Milliseconds since the custom epoch. | | Internal Identifiers | 8 bits | 4 bits for Worker ID + 4 bits for Process ID. | | Increment | 14 bits | Sequence number for IDs generated within the same millisecond. |

Contributing

Contributions are what make the open source community such an amazing place to learn, inspire, and create. Any contributions you make are greatly appreciated.

If you have a suggestion that would make this better, please fork the repo and create a pull request. You can also simply open an issue with the tag "enhancement". Don't forget to give the project a star! Thanks again!

1. Fork the Project
2. Create your Feature Branch (git checkout -b feature/amazing-feature)
3. Commit your Changes (git commit -m 'feat: add some amazing feature')
4. Push to the Branch (git push origin feature/amazing-feature)
5. Open a Pull Request

Top contributors:

License

Copyright 2025 timondev

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.

See LICENSE for more information.