express-useragent vs react-device-detect 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 the client's device, browser, and operating system based on the user agent string sent by the browser. These libraries enable developers to tailor the user experience according to the capabilities and characteristics of the user's device, ensuring optimal performance and functionality. By utilizing these libraries, developers can implement responsive designs, feature detection, and analytics that enhance user engagement and satisfaction.

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express-useragent0653295 kB252 months agoMIT
react-device-detect02,93049.6 kB733 years agoMIT
ua-parser-js010,0791.31 MB19a month agoAGPL-3.0-or-later

Feature Comparison: express-useragent vs react-device-detect vs ua-parser-js

Integration

  • express-useragent:

    express-useragent is designed specifically for Express.js applications, providing middleware that allows for easy integration into your existing request handling. It enhances the request object with user agent information, making it readily accessible for route handling and response customization.

  • react-device-detect:

    react-device-detect is tailored for React applications, allowing developers to easily access device and browser information within React components. Its API is designed to work seamlessly with React's component lifecycle, making it simple to implement conditional rendering based on device type.

  • ua-parser-js:

    ua-parser-js is a standalone library that can be used in any JavaScript environment, including Node.js and browser applications. It does not depend on any frameworks, offering flexibility in how and where it can be implemented.

Feature Detection

  • express-useragent:

    express-useragent provides basic device detection capabilities, allowing you to distinguish between mobile, tablet, and desktop devices. However, it may not cover all edge cases or provide detailed feature detection beyond the user agent string.

  • react-device-detect:

    react-device-detect excels in feature detection, enabling developers to render specific components based on the detected device type, operating system, and browser. This allows for a more tailored user experience, especially in responsive design scenarios.

  • ua-parser-js:

    ua-parser-js offers comprehensive user agent parsing, allowing for detailed detection of browser versions, operating systems, and device types. It provides a rich set of data that can be used for analytics and feature detection.

Performance

  • express-useragent:

    express-useragent is lightweight and optimized for performance within Express.js applications. It adds minimal overhead to request processing, making it suitable for high-performance web applications that require quick user agent parsing.

  • react-device-detect:

    react-device-detect is also lightweight and designed for efficient use in React applications. It minimizes the performance impact by allowing developers to conditionally render components based on device detection, which can help reduce unnecessary rendering.

  • ua-parser-js:

    ua-parser-js is designed to be fast and efficient, with a focus on minimizing the processing time required for user agent parsing. It is suitable for both client-side and server-side applications, ensuring quick responses.

Ease of Use

  • express-useragent:

    express-useragent is straightforward to implement in Express.js applications, requiring minimal setup. The middleware approach allows for easy access to user agent data without extensive configuration.

  • react-device-detect:

    react-device-detect is user-friendly for React developers, providing a simple API that integrates directly into React components. This ease of use makes it accessible for developers of all skill levels.

  • ua-parser-js:

    ua-parser-js has a simple API that is easy to use in any JavaScript context. Its documentation provides clear examples, making it easy for developers to get started with user agent parsing.

Community and Support

  • express-useragent:

    express-useragent benefits from the large Express.js community, which provides a wealth of resources, tutorials, and support for developers. This community aspect can be invaluable for troubleshooting and best practices.

  • react-device-detect:

    react-device-detect has a growing community of React developers who contribute to its development and provide support. The library is actively maintained, ensuring compatibility with the latest React features and updates.

  • ua-parser-js:

    ua-parser-js has a broad user base across various JavaScript environments, leading to a rich set of community resources and contributions. Its active maintenance ensures it stays up-to-date with changes in user agent formats.

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

  • express-useragent:

    Choose express-useragent if you are building a Node.js application and need a middleware solution that integrates seamlessly with Express.js. It provides a simple way to parse user agent strings and access device information directly in your request objects.

  • react-device-detect:

    Choose react-device-detect if you are working on a React application and need a straightforward way to conditionally render components based on the user's device type or browser. It allows for easy integration into React components, making it ideal for responsive design and feature detection.

  • ua-parser-js:

    Choose ua-parser-js if you need a lightweight, standalone library for parsing user agent strings in any JavaScript environment. It offers a comprehensive set of features for detecting various aspects of the user's device and browser, making it suitable for both client-side and server-side applications.

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 react-device-detect

react-device-detect is a popular npm package that allows developers to detect the user's device type and browser information in React applications. This library provides a simple and effective way to tailor user experiences based on the device being used, whether it’s a mobile phone, tablet, or desktop. By leveraging this package, developers can conditionally render components or apply specific styles based on the detected device, enhancing the overall user experience.

While react-device-detect is a robust solution for device detection, there are alternatives available that can also help with responsive design and conditional rendering based on device types. One notable alternative is:

  • react-responsive is a library that provides a set of components and hooks for responsive design in React applications. It allows developers to create media queries directly in their components, enabling them to render different UI elements based on the screen size or device type. Unlike react-device-detect, which focuses on detecting specific devices, react-responsive is more about adapting the layout and content based on the viewport size. This makes it a great choice for applications that need to be responsive across various devices without needing to specifically identify the device type.

For a detailed comparison of these two packages, you can visit: Comparing react-device-detect vs react-responsive.

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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