express-useragent vs device-detector-js vs ua-parser-js
User-Agent Parsing Libraries
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User-Agent Parsing Libraries

User-Agent parsing libraries are essential tools in web development that help identify and analyze the characteristics of devices accessing a web application. These libraries parse the User-Agent string sent by browsers and devices, allowing developers to tailor responses based on device type, operating system, browser version, and other attributes. This capability is crucial for optimizing user experience, ensuring compatibility across different platforms, and implementing responsive design strategies. By utilizing these libraries, developers can enhance analytics, improve performance, and deliver a more personalized experience to users.

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express-useragent253,620653295 kB242 months agoMIT
device-detector-js156,6905001.62 MB15-LGPL-3.0
ua-parser-js010,1041.31 MB192 months agoAGPL-3.0-or-later

Feature Comparison: express-useragent vs device-detector-js vs ua-parser-js

Device Detection Accuracy

  • express-useragent:

    express-useragent offers basic device detection capabilities and is sufficient for many applications. However, it may not be as comprehensive as device-detector-js, as it primarily focuses on identifying whether the user is on a mobile or desktop device without deep insights into specific device models or browser versions.

  • device-detector-js:

    device-detector-js is known for its high accuracy in detecting a wide variety of devices, including specific models and versions of browsers. It maintains an extensive database of user-agent strings, which allows it to provide detailed information about the device type, operating system, and browser, making it suitable for applications that require precise analytics.

  • ua-parser-js:

    ua-parser-js provides a good balance of accuracy and performance. It can detect various devices, browsers, and operating systems, but its accuracy may vary depending on the complexity of the user-agent string. It is a solid choice for projects that require reliable detection without the need for exhaustive detail.

Integration and Ease of Use

  • express-useragent:

    express-useragent is designed specifically for Express.js applications, making it extremely easy to integrate as middleware. Its simplicity allows developers to get started quickly, requiring minimal setup and configuration, which is ideal for projects that prioritize rapid development.

  • device-detector-js:

    device-detector-js is easy to integrate into various environments, including Node.js and browser applications. It provides a straightforward API that allows developers to quickly implement device detection without extensive configuration, making it user-friendly for developers of all skill levels.

  • ua-parser-js:

    ua-parser-js is also easy to use and can be integrated into both client-side and server-side applications. Its API is intuitive, allowing developers to parse user-agent strings with just a few lines of code, making it a flexible choice for various project types.

Performance

  • express-useragent:

    express-useragent is lightweight and performs well in typical use cases. Its focus on essential device detection means that it doesn't introduce much overhead, making it suitable for applications that require quick responses without extensive processing.

  • device-detector-js:

    device-detector-js is optimized for performance, allowing for quick parsing of user-agent strings without significant overhead. Its efficient design ensures that applications can handle high traffic without noticeable delays in device detection, which is crucial for maintaining a responsive user experience.

  • ua-parser-js:

    ua-parser-js is designed to be lightweight and efficient, providing fast parsing capabilities. It strikes a good balance between performance and functionality, making it suitable for applications that need to process user-agent strings frequently without impacting overall performance.

Customization and Extensibility

  • express-useragent:

    express-useragent is not highly customizable, as it focuses on providing basic device detection. It is best suited for applications that do not require extensive customization and can work with the default detection capabilities provided.

  • device-detector-js:

    device-detector-js offers limited customization options, as it relies on its internal database for device detection. However, it is regularly updated to include new devices and browsers, ensuring that it remains relevant without requiring extensive user intervention.

  • ua-parser-js:

    ua-parser-js is highly customizable, allowing developers to extend its functionality or modify its parsing logic if needed. This flexibility makes it a great choice for projects that require tailored user-agent detection or specific handling of certain user-agent strings.

Community and Support

  • express-useragent:

    express-useragent has a smaller community compared to the other two libraries, but it is still maintained and supported. Documentation is straightforward, making it easy for developers to find the information they need for integration and usage.

  • device-detector-js:

    device-detector-js has a growing community and is actively maintained, which means that developers can find support and resources easily. The library's documentation is comprehensive, providing clear guidance on usage and implementation.

  • ua-parser-js:

    ua-parser-js has a strong community and is widely used across various projects. It benefits from extensive documentation and examples, making it easier for developers to implement and troubleshoot issues.

How to Choose: express-useragent vs device-detector-js vs ua-parser-js

  • express-useragent:

    Choose express-useragent if you are building an Express.js application and need a lightweight middleware solution that integrates seamlessly with your existing setup. It provides basic user-agent parsing capabilities and is easy to implement, making it suitable for applications that require quick and straightforward user-agent detection.

  • device-detector-js:

    Choose device-detector-js if you need a comprehensive solution that accurately detects a wide range of devices, including mobile, tablet, and desktop, along with detailed information about the operating system and browser. It is particularly useful for applications that require extensive device analytics and reporting.

  • ua-parser-js:

    Choose ua-parser-js if you need a versatile and lightweight library that can be used in both client-side and server-side environments. It offers a simple API for parsing user-agent strings and is highly customizable, making it ideal for projects that require flexibility in user-agent detection without the overhead of a larger library.

Similar Npm Packages to express-useragent

express-useragent is a middleware for Express applications that allows developers to easily detect user agents in incoming requests. It provides a simple way to parse the user agent string and extract useful information about the client's device, operating system, and browser. This can be particularly useful for tailoring responses based on the client's capabilities or for analytics purposes. By integrating express-useragent, developers can enhance their applications' responsiveness and user experience based on the specific characteristics of the user's device.

While express-useragent is a great choice for server-side user agent detection, there are alternatives that can be used in different contexts, especially in client-side applications. Here are a couple of notable alternatives:

  • react-device-detect is a popular library for detecting device types and capabilities in React applications. It provides a set of components and hooks that allow developers to conditionally render UI elements based on the detected device, such as mobile, tablet, or desktop. This library is particularly useful for responsive design and ensuring that users have an optimal experience regardless of the device they are using. If you are building a React application and need to detect devices on the client side, react-device-detect is an excellent choice.
  • ua-parser-js is a lightweight JavaScript library for parsing user agent strings. It can be used in both client-side and server-side applications to extract information about the browser, engine, operating system, and device type. ua-parser-js is versatile and can be integrated into various environments, making it a good option for developers looking for a comprehensive user agent parsing solution. If you need a more general-purpose library that can be used outside of Express, ua-parser-js is a solid alternative.

To see how express-useragent compares with react-device-detect and ua-parser-js, check out the comparison: Comparing express-useragent vs react-device-detect vs ua-parser-js.

Similar Npm Packages to device-detector-js

device-detector-js is a JavaScript library designed to help developers identify the device type, operating system, and browser of users based on the user agent string. This can be particularly useful for tailoring user experiences based on the capabilities of different devices, such as mobile phones, tablets, and desktops. With its straightforward API, device-detector-js allows for quick and easy detection of device characteristics, making it a valuable tool for responsive design and analytics.

However, there are several alternatives to device-detector-js that also provide similar functionality:

  • platform is a lightweight JavaScript library that provides a simple way to detect the platform (browser, operating system, and device type) of the user. It offers a clean and easy-to-use API, allowing developers to access platform information without the complexity of parsing user agent strings manually. If you need a straightforward solution for platform detection without the overhead of a more comprehensive library, platform is an excellent choice.

  • ua-parser-js is another popular library for parsing user agent strings. It provides detailed information about the device, operating system, and browser, making it suitable for applications that require in-depth user agent analysis. ua-parser-js is highly customizable and can be extended to support additional user agent strings, making it a flexible option for developers who need precise device detection capabilities.

To explore how device-detector-js compares with platform and ua-parser-js, check out the comparison: Comparing device-detector-js vs platform vs ua-parser-js.

Similar Npm Packages to ua-parser-js

ua-parser-js is a lightweight JavaScript library that helps developers parse user agent strings to extract useful information about the user's device, browser, and operating system. This library is particularly useful for web applications that need to tailor their content or functionality based on the user's environment. By providing a straightforward API, ua-parser-js allows developers to easily identify the characteristics of the client's device, enabling better user experiences.

While ua-parser-js is a popular choice for user agent parsing, there are several alternatives that developers can consider:

  • device-detector-js is a powerful library that provides detailed information about the user's device, including its type, brand, model, and operating system. It is designed to be fast and efficient, making it suitable for applications that require real-time device detection. device-detector-js is particularly useful for applications that need to provide tailored experiences based on device characteristics, such as responsive design or feature availability.

  • express-useragent is a middleware for Express.js that parses the user agent string and provides an easy-to-use interface for accessing device information. It integrates seamlessly with Express applications, allowing developers to access user agent data directly from the request object. If you are building an Express application and need a simple way to handle user agent parsing, express-useragent is an excellent choice.

To compare these libraries and see how they stack up against each other, check out the following link: Comparing device-detector-js vs express-useragent vs ua-parser-js.

README for express-useragent

npm version CI

express-useragent

Fast user-agent parser with first-class Express middleware and TypeScript typings. Works server-side in Node.js and in the browser via a lightweight IIFE bundle.

Requires Node.js 18 or newer.

Install

npm install express-useragent

Quick Start

import http from 'node:http';
import { UserAgent } from 'express-useragent';

const server = http.createServer((req, res) => {
  const source = req.headers['user-agent'] ?? 'unknown';
  const parser = new UserAgent().hydrate(source);

  res.writeHead(200, { 'Content-Type': 'application/json' });
  res.end(JSON.stringify(parser.Agent));
});

server.listen(3000);

Express Middleware

ESM usage (Node 18+):

import express from 'express';
import { express as useragent } from 'express-useragent';

const app = express();

app.use(useragent());

app.get('/', (req, res) => {
  res.json({
    browser: req.useragent?.browser,
    os: req.useragent?.os,
  });
});

app.listen(3000);

Alternatively, you can import the whole namespace:

import express from 'express';
import * as useragent from 'express-useragent';

const app = express();

app.use(useragent.express());

app.get('/', (req, res) => {
  res.json({
    browser: req.useragent?.browser,
    os: req.useragent?.os,
  });
});

app.listen(3000);

CommonJS (require) still supports the default export pattern used in older examples:

const express = require('express');
const useragent = require('express-useragent');

const app = express();

app.use(useragent.express());

app.get('/', (req, res) => {
  res.json({
    browser: req.useragent?.browser,
    os: req.useragent?.os,
  });
});

app.listen(3000);

ESM vs CJS at a glance

  • ESM (Node 18+):
    • Named import of middleware: 
      import { express as useragent } from 'express-useragent';
app.use(useragent());
    • Namespace import: 
      import * as useragent from 'express-useragent';
app.use(useragent.express());
  • CommonJS (require): 
    const useragent = require('express-useragent');
app.use(useragent.express());

Migrating from v1.x to v2.x

  • In v1.x, import useragent from 'express-useragent' returned an object with an .express() method used as middleware.
  • In v2.x, the default export is a parser instance (for direct parsing). The Express middleware is provided as a named export express (and alias useragentMiddleware). Use one of:
    • import { express as useragent } from 'express-useragent' → app.use(useragent())
    • import * as useragent from 'express-useragent' → app.use(useragent.express())
  • CommonJS require('express-useragent').express() continues to work unchanged.

See more end-to-end demos under examples/:

  • examples/server.ts — Express middleware demo
  • examples/http.ts — raw Node HTTP sample

API Highlights

  • new UserAgent() — build a fresh parser instance.
  • useragent.parse(source) — quick parse returning the agent snapshot.
  • useragent.express() — Express-compatible middleware that hydrates req.useragent and res.locals.useragent.
  • parser.Agent — normalized fingerprint with convenience booleans (isMobile, isBot, etc.).

Sample payload:

{
  "isMobile": false,
  "isDesktop": true,
  "isBot": false,
  "browser": "Chrome",
  "version": "118.0.0",
  "os": "macOS Sonoma",
  "platform": "Apple Mac",
  "source": "Mozilla/5.0 (Macintosh; Intel Mac OS X 14_0)..."
}

Browser Usage

The build exports drop-in browser bundles under dist/browser/:

  • express-useragent.global.js — readable IIFE that exposes window.UserAgent and window.useragent.
  • express-useragent.global.min.js — minified version of the same API.
<script src="/vendor/express-useragent.global.min.js"></script>
<script>
  const agent = new UserAgent().parse(navigator.userAgent);
  console.log(agent.browser, agent.version);
</script>

Prefer consuming the ESM/CJS entry from your bundler when possible:

import { UserAgent } from 'express-useragent';

const agent = new UserAgent().parse(navigator.userAgent);

Scripts

npm install        # install dependencies
npm run lint       # lint the TypeScript sources, tests, and examples
npm run typecheck  # run the TypeScript compiler in noEmit mode
npm test           # execute Vitest (includes adapted legacy suites)
npm run build      # emit dist/ (CJS, ESM, d.ts, browser bundles)

Examples for manual testing:

npm run http      # raw Node HTTP sample
npm run express   # Express middleware demo
npm run simple    # CLI parsing helper

Contributing

Bug reports and PRs are welcome. When submitting changes, please include:

  • Updated tests under tests/ covering new parsing behaviour.
  • npm test and npm run lint output or reproduction steps.
  • Notes in the changelog for breaking updates.

See CONTRIBUTING.md for detailed guidelines, including how to update the bot list.

License

MIT © Aleksejs Gordejevs and contributors.

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