https://github.com/bsnext/fastify-bowser

A plugin for Fastify that adds the 'request.useragent' property to get header 'user-agent' parsed data.
https://github.com/bsnext/fastify-bowser

bowser fastify parser plugin typescript useragent

Last synced: 3 months ago
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A plugin for Fastify that adds the 'request.useragent' property to get header 'user-agent' parsed data.

• Host: GitHub
• URL: https://github.com/bsnext/fastify-bowser
• Owner: bsnext
• License: other
• Created: 2024-10-19T08:49:10.000Z (over 1 year ago)
• Default Branch: main
• Last Pushed: 2025-06-10T04:10:21.000Z (about 1 year ago)
• Last Synced: 2025-06-27T03:50:53.421Z (12 months ago)
• Topics: bowser, fastify, parser, plugin, typescript, useragent
• Language: TypeScript
• Homepage: https://www.npmjs.com/package/@bsnext/fastify-bowser
• Size: 21.5 KB
• Stars: 1
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

          
# Fastify-Bowser

![Build & Test](https://github.com/bsnext/fastify-bowser/actions/workflows/build_n_test.yml/badge.svg)

![Node.JS Supported](https://badgen.net/static/Node.JS/%3E=19.0.0/green)

![Fastify Supported](https://badgen.net/static/Fastify/%3E=4.14.0/green)

![Install Size](https://badgen.net/packagephobia/install/@bsnext/fastify-bowser)

![Dependencies](https://badgen.net/bundlephobia/dependency-count/@bsnext/fastify-bowser)

![License](https://badgen.net/static/license/MIT/blue)

The plugin adds the "request.useragent" property, which returns the parsed data.

**Tested on Fastify v4.14+ and Node.JS v19+!**


https://github.com/bsnext/fastify-bowser/actions/workflows/build_n_test.yml

Why "[bowser](https://www.npmjs.com/package/bowser)", not "[ua-parser-js](https://www.npmjs.com/package/ua-parser-js)" or other library?

Bowser it's a zero-dependency package with MIT license, unlike "ua-parser-js" under AGPL-3.0. Both of these libraries are good, but on top of that, bowser [is about x4 times more faster](https://github.com/bsnext/fastify-bowser/blob/master/info/benchmark.md).

Why not [those package](https://github.com/Eomm/fastify-user-agent)? Under hood it have a "[useragent](https://www.npmjs.com/package/useragent)" - library with 2 dependencies. One of that is "LRU-Cache". But without cache it [have a performance less than both previously](https://github.com/bsnext/fastify-bowser/blob/master/info/benchmark.md) mentioned libraries. Also, **this library excludes parsing of user-agent until you call this property in request**.

## Installing:

```bash

npm install @bsnext/fastify-bowser

```

## Usage:

```ts

import FastifyBowser from '@bsnext/fastify-bowser'; // TS

import { default as FastifyBowser } from "@bsnext/fastify-bowser"; // MJS

const { default: FastifyBowser } = require(`@bsnext/fastify-bowser`); // CJS

const server = Fastify();

await server.register(FastifyBowser, {

	// Use parsed user-agent LRU cache

	cache: boolean = false; 

 	// Cache LRU max size.

	cacheLimit?: number = 100;

	// Automatically cache purge interval in seconds.

	// Disabled by default

	cachePurgeTime?: number;

});

```

## Example

```ts

import Fastify from 'fastify'; 

import FastifyBowser from '@bsnext/fastify-bowser';

const server = Fastify(...);

await server.register(FastifyBowser, { cache: true });

server.get(`/test`, function(request, response) {

	response.send(request.useragent);

	/* {

		browser: { name: 'Chrome', version: '129.0.0.0' },

		os: { name: 'Windows', version: 'NT 10.0', versionName: '10' },

		platform: { type: 'desktop' },

		engine: { name: 'Blink' }

	} */

})

server.listen({ port: 8080 });

```