The express-useragent npm package is a middleware for Express.js that allows you to parse the user-agent header to identify the user's browser, operating system, and device type. This can be useful for tailoring responses based on the client's environment.

What are express-useragent's main functionalities?

Detect Browser

This feature allows you to detect the browser being used by the client. The code sample demonstrates how to set up an Express.js server that responds with the client's browser name.

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

app.use(useragent.express());

app.get('/', (req, res) => {
  res.send(`You are using ${req.useragent.browser}`);
});

app.listen(3000, () => {
  console.log('Server is running on port 3000');
});

Detect Operating System

This feature allows you to detect the operating system of the client. The code sample shows how to set up an Express.js server that responds with the client's operating system.

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

app.use(useragent.express());

app.get('/', (req, res) => {
  res.send(`You are using ${req.useragent.os}`);
});

app.listen(3000, () => {
  console.log('Server is running on port 3000');
});

Detect Device Type

This feature allows you to detect whether the client is using a mobile or desktop device. The code sample demonstrates how to set up an Express.js server that responds with the type of device being used.

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

app.use(useragent.express());

app.get('/', (req, res) => {
  res.send(`You are using a ${req.useragent.isMobile ? 'mobile' : 'desktop'} device`);
});

app.listen(3000, () => {
  console.log('Server is running on port 3000');
});

Other packages similar to express-useragent

Readme

Source

Fast Middleware exposing user-agent for NodeJS

express-useragent is a simple NodeJS/ExpressJS user-agent middleware exposing user-agent details to your application and views.

Installation

Installation is done using the Node Package Manager (npm). If you don't have npm installed on your system you can download it from npmjs.org To install express-useragent:

    $ npm install express-useragent --save

Usage overview

Simple Node App

var http = require('http')
  , useragent = require('express-useragent');

var srv = http.createServer(function (req, res) {
  var source = req.headers['user-agent'],
  ua = useragent.parse(source);
  res.writeHead(200, {'Content-Type': 'text/plain'});
  res.end(JSON.stringify(ua));
});

srv.listen(3000);

for TrinteJS

is permanently included

manual setup in project config/middleware.js

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

module.exports = function (app, express) {
    app.use(function () {
        app.use(useragent.express());
    });
};

for ExpressJS

var express = require('express');
var app = express();
var useragent = require('express-useragent');

app.use(useragent.express());
app.get('/', function(req, res){
    res.send(req.useragent);
});
app.listen(3000);

module provides details such as the following:

{
  "isMobile":false,
  "isDesktop":true,
  "isBot":false,
  .....
  "browser":"Chrome",
  "version":"17.0.963.79",
  "os":"Windows 7",
  "platform":"Microsoft Windows",
  "source":"Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/535.11 (KHTML, like Gecko) Chrome/17.0.963.79..."
}

Accessing the User-Agent

If you are using express or connect, then express-useragent provides an easy way to access the user-agent as:

req.useragent from your app server
useragent helper accessible from your express views.

Client Side

Clone the repo: git clone git://github.com/biggora/express-useragent.git
Or Install with Bower: bower install express-useragent.

The client side version of express-useragent available in the lib/ subdirectory.

Include file in your HTML. The minimum required for this plugin are:

    <script type="text/javascript" src="/path/to/express-useragent.js"></script>

Execute the plugin:

    var userAgent = new UserAgent().parse(navigator.userAgent);

Running Tests

Ensure you have nodeunit by running npm install -g nodeunit. Then, run npm test.

npm install
npm test

Run Example Node App

npm run-script http

Run Example Express App

npm run-script express

In the Wild

The following projects use express-useragent.

If you are using express-useragent in a project, app, or module, get on the list below by getting in touch or submitting a pull request with changes to the README.

Startups & Apps

Author

Alexey Gordeyev (aleksej@gordejev.lv).

License

(The MIT License)

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the 'Software'), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

Resources

Visit the author website.
Follow @biggora on Twitter for updates.
Report issues on the github issues page.

Keywords

FAQs

What is express-useragent?

Is express-useragent popular?

Is express-useragent well maintained?

Last updated on 07 Jan 2017

Did you know?

Socket for GitHub automatically highlights issues in each pull request and monitors the health of all your open source dependencies. Discover the contents of your packages and block harmful activity before you install or update your dependencies.

Install

express-useragent