fastify-uws

A performant HTTP and WebSocket server for Fastify with uWebSockets.

Installation

Install fastify-uws with your favorite package manager:

$ npm i fastify-uws
# or
$ yarn add fastify-uws
# or
$ pnpm i fastify-uws
# or
$ bun add fastify-uws

Supported

• fastify v5.x
• @fastify/websocket v11.x

Usage

Just two lines are needed to speed up your Fastify application.

// app.ts
import fastify from 'fastify';
import { serverFactory } from 'fastify-uws'; // Import here

import router from '~/plugins/router';

export default () => {
  const app = fastify({
    logger: {
      transport: {
        target: '@fastify/one-line-logger',
      },
    },
    serverFactory, // And use here
  });

  app.register(router);

  return app;
};

// server.ts
import app from './app';

const server = app();

const start = async () => {
  try {
    await server.listen({
      host: '127.0.0.1',
      port: 3000,
    });
  } catch (err) {
    server.log.error(err);
    process.exit(1);
  }
};

start();

Use Fetch

// src/routes/hello-http/+handler.ts
import type { FastifyPluginAsyncTypebox } from '@fastify/type-provider-typebox';
import { Type } from '@sinclair/typebox';

export default (async (app) => {
  app.get(
    '',
    {
      schema: {
        response: {
          200: Type.Object({
            message: Type.String(),
          }),
        },
      },
    },
    async (req, reply) => {
      return reply.send({
        message: 'Hello, World!',
      });
    },
  );
}) as FastifyPluginAsyncTypebox;

With FormData

// app.ts
import multipart from '@fastify/multipart';

app.register(multipart);

// src/routes/hello-fd/+handler.ts
import type { FastifyPluginAsyncTypebox } from '@fastify/type-provider-typebox';
import fs from 'node:fs';
import { pipeline } from 'node:stream/promises';

export default (async (app) => {
  app.post('', async (req, reply) => {
    const data = await req.file();

    data.file; // stream
    data.fields; // other parsed parts
    data.fieldname;
    data.filename;
    data.encoding;
    data.mimetype;

    await pipeline(data.file, fs.createWriteStream(data.filename));
    // or
    // await data.toBuffer(); // Buffer

    return reply.send({ message: 'ok' });
  });
}) as FastifyPluginAsyncTypebox;

Use WebSocket

Just a single line of change can speed up your WebSocket application in Fastify.

- import websocket from '@fastify/websocket';
+ import { websocket } from 'fastify-uws';

// app.ts
import { websocket } from 'fastify-uws';

app.register(websocket);

// src/routes/hello-ws/+handler.ts
import type { FastifyPluginAsyncTypebox } from '@fastify/type-provider-typebox';

export default (async (app) => {
  app.get('', { websocket: true }, (socket, request) => {
    app.log.info('Client connected');

    socket.on('message', (message: MessageEvent) => {
      console.log(`Client message: ${message}`);
      socket.send('Hello from Fastify!');
    });

    socket.on('close', () => {
      app.log.info('Client disconnected');
    });
  });
}) as FastifyPluginAsyncTypebox;

Use EventSource

// app.ts
import { eventsource } from 'fastify-uws';

app.register(eventsource);

// src/routes/hello-sse/+handler.ts
import type { FastifyPluginAsyncTypebox } from '@fastify/type-provider-typebox';

export default (async (app) => {
  app.get('', (req, reply) => {
    let index = 0;

    reply.sse({ id: String(index), data: `Some message ${index}` });

    const interval = setInterval(() => {
      index += 1;

      reply.sse({ id: String(index), data: `Some message ${index}` });

      if (index === 10) {
        clearInterval(interval);
      }
    }, 1000);

    req.raw.on('close', () => {
      clearInterval(interval);
      app.log.info('Client disconnected');
      reply.sse({ event: 'close' });
    });
  });
}) as FastifyPluginAsyncTypebox;

Benchmarks

oha v1.4.5

$ oha -c 500 -z 10s --no-tui http://0.0.0.0:3000/api/hello-world

| | Version | Language | Router | Requests/sec | | :------------ | ------------: | :-------------- | -----: | -----------: | | hyper | 1.4.1 | Rust | ✗ | 56,175.6102 | | warp | 0.3.7 | Rust | ✓ | 55,868.5861 | | axum | 0.7.7 | Rust | ✓ | 54,588.2828 | | bun | 1.1.30 | TypeScript/Bun | ✗ | 54,098.4841 | | graphul | 1.0.1 | Rust | ✓ | 53,949.4400 | | poem | 3.1.0 | Rust | ✓ | 53,849.0781 | | uws | 20.48.0 | JavaScript/Node | ✗ | 52,802.8029 | | elysia | 1.1.17 | TypeScript/Bun | ✓ | 52,257.3305 | | | | | | ~ 5.5k ~ | | hyper-express | 6.17.2 | JavaScript/Node | ✓ | 46,745.4887 | | hono | 4.6.3 | TypeScript/Bun | ✓ | 46,685.6014 | | nhttp | 2.0.2 | TypeScript/Deno | ✓ | 44,874.2535 | | deno | 2.0.0 | TypeScript/Deno | ✗ | 44,753.8552 | | hono | 4.6.3 | TypeScript/Deno | ✓ | 43,280.7544 | | | | | | ~ 9.2k ~ | | h3 | 1.12.0 | TypeScript/Bun | ✓ | 34,043.4693 | | fastify-uws | 1.0.0 | JavaScript/Node | ✓ | 31,295.8715 | | polka | 1.0.0-next.28 | JavaScript/Node | ✓ | 31,086.5543 | | oak | 17.0.0 | TypeScript/Deno | ✓ | 30,730.7971 | | node | 20.18.0 | JavaScript/Node | ✗ | 29,230.1719 | | oak | 17.0.0 | TypeScript/Bun | ✓ | 27,449.3417 | | fastify | 5.0.0 | JavaScript/Node | ✓ | 27,408.6679 | | hono | 4.6.3 | JavaScript/Node | ✓ | 25,138.5659 | | | | | | ~ 4.9k ~ | | h3 | 1.12.0 | JavaScript/Node | ✓ | 20,193.2311 | | | | | | ~ 9.2k ~ | | express | 4.21.0 | JavaScript/Node | ✓ | 10,949.1532 |