express-useragent vs react-device-detect vs ua-parser-js vs useragent
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 characteristics of a user'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 device capabilities, optimize performance, and provide device-specific features. By analyzing the User-Agent string, developers can implement responsive designs, enhance accessibility, and improve overall user engagement by delivering content that is best suited for the user's environment.

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express-useragent0651295 kB25a month agoMIT
react-device-detect02,93249.6 kB733 years agoMIT
ua-parser-js010,0681.31 MB21a month agoAGPL-3.0-or-later
useragent0904-738 years agoMIT

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

Parsing Accuracy

  • express-useragent:

    express-useragent provides a simple and effective way to parse User-Agent strings, focusing primarily on Express.js applications. While it offers decent accuracy, it may not cover all edge cases or provide as detailed information as some other libraries.

  • react-device-detect:

    react-device-detect excels in detecting device types (mobile, tablet, desktop) and specific browsers, making it highly effective for React applications. However, it may not provide in-depth details about the operating system or browser versions compared to more comprehensive libraries.

  • ua-parser-js:

    ua-parser-js is known for its high accuracy and ability to parse a wide variety of User-Agent strings, providing detailed information about the browser, engine, OS, and device type. It is a robust choice for applications that require precise detection across different environments.

  • useragent:

    useragent offers extensive parsing capabilities with a focus on accuracy and detail. It can handle a wide range of User-Agent strings, including those from legacy browsers, and provides features like version comparison, making it one of the most comprehensive options available.

Integration Ease

  • express-useragent:

    express-useragent is designed specifically for Express.js, making it easy to integrate into existing middleware. Its lightweight nature allows for quick setup and minimal configuration, ideal for developers already using Express.

  • react-device-detect:

    react-device-detect is straightforward to integrate into React applications, allowing developers to easily conditionally render components based on device detection. It requires minimal setup and is user-friendly for those familiar with React.

  • ua-parser-js:

    ua-parser-js can be used in various environments (both client and server-side), but may require more initial setup compared to express-useragent or react-device-detect. Its versatility makes it suitable for diverse applications, but it might be slightly more complex to implement.

  • useragent:

    useragent can be integrated into Node.js applications with ease, but it may require more configuration than express-useragent. Its extensive feature set can be beneficial for developers needing detailed parsing, but it may introduce additional complexity.

Performance

  • express-useragent:

    express-useragent is lightweight and optimized for performance within Express applications, ensuring minimal overhead when parsing User-Agent strings during request handling.

  • react-device-detect:

    react-device-detect is efficient for client-side detection, but performance may vary based on the number of device checks performed in a React application, especially if used extensively in rendering logic.

  • ua-parser-js:

    ua-parser-js is designed for performance and can handle parsing efficiently. However, performance may be impacted if used excessively in high-frequency scenarios, such as on every render in a React component.

  • useragent:

    useragent is generally performant but can become slower with complex User-Agent strings or when handling a large volume of requests. Optimization strategies may be needed in high-load scenarios.

Community and Maintenance

  • express-useragent:

    express-useragent has a smaller community compared to more popular libraries, but it is actively maintained and sufficient for basic use cases within Express applications.

  • react-device-detect:

    react-device-detect has a growing community and is actively maintained, making it a reliable choice for React developers looking for device detection solutions.

  • ua-parser-js:

    ua-parser-js boasts a large community and is widely used, ensuring regular updates and support. Its popularity contributes to its reliability and ongoing maintenance.

  • useragent:

    useragent has a stable community and is actively maintained, but its popularity is less than that of ua-parser-js. It remains a solid choice for developers needing detailed parsing capabilities.

Documentation and Learning Curve

  • express-useragent:

    express-useragent has straightforward documentation, making it easy for developers familiar with Express.js to get started quickly. The learning curve is minimal for those already using Express.

  • react-device-detect:

    react-device-detect offers clear documentation and examples, making it beginner-friendly for React developers. The learning curve is low, especially for those with React experience.

  • ua-parser-js:

    ua-parser-js provides comprehensive documentation, but the learning curve may be steeper for developers unfamiliar with User-Agent parsing concepts. However, once understood, it offers powerful capabilities.

  • useragent:

    useragent has detailed documentation, but the learning curve can be moderate due to its extensive feature set. Developers may need time to fully leverage its capabilities.

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

  • express-useragent:

    Choose express-useragent if you are working within an Express.js application and need a lightweight solution to parse User-Agent strings directly from the request object, making it easy to implement device detection in your middleware.

  • react-device-detect:

    Select react-device-detect if you are building a React application and require a straightforward way to conditionally render components based on the user's device type, such as mobile or desktop, without needing to manage User-Agent strings manually.

  • ua-parser-js:

    Opt for ua-parser-js if you need a versatile and standalone User-Agent parser that can be used in both client-side and server-side environments, providing detailed information about the browser, engine, OS, and device type, making it suitable for various applications beyond just Express or React.

  • useragent:

    Use useragent if you want a comprehensive library that provides detailed parsing capabilities and supports a wide range of User-Agent strings, including legacy browsers, while also offering additional features like version comparison and device type detection.

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.

Similar Npm Packages to useragent

useragent is a Node.js library that helps developers parse user agent strings to extract useful information about the client's device, operating system, and browser. This can be particularly useful for tailoring experiences based on the user's environment. While useragent provides a robust solution for user agent parsing, there are several alternatives in the ecosystem that offer similar functionalities. Here are a few noteworthy options:

  • express-useragent is a middleware for Express.js that provides an easy way to parse user agent strings. It integrates seamlessly with Express applications, allowing developers to access user agent information directly from the request object. If you're building an Express-based application and need a straightforward way to handle user agent data, express-useragent is an excellent choice that simplifies the process without adding unnecessary complexity.

  • react-device-detect is a React-specific library that allows developers to detect the device type (mobile, tablet, desktop) and browser information directly within React components. It provides a set of utility functions and components that make it easy to conditionally render UI based on the detected device. If you're working within a React application and need to tailor your components based on the user's device, react-device-detect offers a convenient solution.

  • ua-parser-js is a lightweight JavaScript library that can parse user agent strings in both browser and Node.js environments. It provides a comprehensive API for extracting information about the browser, engine, OS, CPU, and device. If you need a versatile and powerful library for user agent parsing that can be used in various environments, ua-parser-js is a solid option that offers detailed insights.

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

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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