Getting Query String Variables in Express.js

In Express.js, you can directly use the req.query() method to access the string variables. As per the documentation, the req.param method only gets the route parameters, whereas the req.query method checks the query string parameters. For example, "?id=12" checks urlencoded body params.

Syntax

req.query( )

Example 1

Create a file with the name "reqQuery.js" and copy the following code snippet. After creating the file, use the command "node reqQuery.js" to run this code as shown in the example below −

// req.query() Demo Example
// Importing the express module
var express = require('express');

// Initializing the express and port number
var app = express();
var PORT = 3000;

// Getting the request query string
app.get('/api', function(req, res){
   console.log('id: ' + req.query.id)
   res.send('id: ' + req.query.id);
});

// Listening to the port
app.listen(PORT, function(err){
   if (err) console.log(err);
   console.log("Server listening on PORT", PORT);
});

Output

Hit the endpoint "localhost:3000/api?id=21" with a GET Request −

C:\home
ode>> node reqQuery.js
Server listening on PORT 3000
id: 21

Example 2

Let's take a look at one more example.

// res.query() Demo Example
// Importing the express module
var express = require('express');

// Initializing the express and port number
var app = express();
var PORT = 3000;

// Getting the request query string
app.get('/api', function(req, res){
   console.log('name: ' + req.query.id)
   res.send('name: ' + req.query.id);
});

// Listening to the port
app.listen(PORT, function(err){
   if (err) console.log(err);
   console.log("Server listening on PORT", PORT);
});

Output

Hit the endpoint "localhost:3000/api?id=tutorialspoint" with a GET Request:

C:\home
ode>> node reqQuery.js
Server listening on PORT 3000
name: tutorialspoint