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How to Get URL Parameters in Node.js?

In node.Js application, You can use the app.post() method to accept a POST request. req object is used to Get the post data inside the callback function of the app.post() method.

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const bodyContent = req.body;
// To access the header content
const headerContent = req.headers;

Steps : create Node Project

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  • Step 1:- First install the Node.Js in your system.
  • Step 2:- Create a project Directory. eg. mynode_project
  • Step 3:- C:\mynode_project>
  • Step 4:- Now install express Js inside your project
  • Step 5:- c:\mynode_project> npm install express
  • Step 6 :- create file myapp.js in your project directory.
  • Step 7 :- create file index.html in your project directory.
  • Step 8 :- run your project. C:\mynode_project> node myapp.js

    • Myapp.js

    File Name : myapp.js

    const express = require('express');
    const app = express();
    app.use(express.json());
    app.get('/', (req, res) => {
    res.sendFile(__dirname + '/index.html');
    });
    app.post('/', (req, res) => {
    const { username, password } = req.body;
    const { authorization } = req.headers;
    res.send({
    username,
    password,
    authorization,
    });
    });
    app.listen(3000);
    // app.listen(8080);

    View Page index.html

    File Name : index.html

    <!DOCTYPE html>
    <html lang="en">
    <head>
    <meta charset="UTF-8" />
    <title>How to get Post data in node.Js</title>
    </head>
    <body>
    <form>
    <div>
    <label>Username</label>
    <input type="text" id="user" name="user"/>
    </div>
    <div>
    <label>Password</label>
    <input type="password" id="pass" name="pass"/>
    </div>
    <button type="submit">Submit</button>
    </form>

    <script>
    document.querySelector('button')
    .addEventListener('click', (e) => {
    e.preventDefault();
    const username = document
    .querySelector('#user').value;

    const password = document
    .querySelector('#pass').value;

    fetch('/', {
    method: 'POST',
    headers: {
    Authorization: 'mahi',
    'Content-Type': 'application/json',
    },
    body: JSON.stringify({
    username,
    password,
    }),
    })
    .then((res) => {
    return res.json();
    })
    .then((data) => console.log(data));
    });
    </script>
    </body>
    </html>

    Run :-

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    c:\mynode_project> node myapp.js

    Test On browser

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    in URL :- http://localhost:3000

    URL Module :-

    we can get URL parameters in Node.js by importing the url module.

    The get() method of URLSearchParams object gets the value of the given url parameter.

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    const url = require('url');

    // new URL object
    const current_url = new URL('http://ittutorial.in/controller/method?id=07&name=sana');

    // get access to URLSearchParams object
    const params = current_url.searchParams;

    // get url parameters
    const id = params.get('id');
    const name = params.get('name');
    console.log(id);
    console.log(name);

    Getting Values of Multi-Valued Parameters

    The getAll() method of URLSearchParams object returns an array of values of the given parameter.

    File Name :

    const url = require('url');

    const current_url = new URL('http://ittutorial.in/controller/method?id=07&name=sana');
    const search_params = current_url.searchParams;

    const params = search_params.getAll('tags');
    // [ "07", "sana" ]
    console.log(params );

    Checking If Parameter Present or not :-

    The has() method checks given parameter exists in the url.

    File Name :

    const url = require('url');

    const current_url = new URL('http://ittutorial.in/controller/method?id=07&name=sana');
    const search_params = current_url.searchParams;

    // true
    if(search_params.has('id')) {
    //
    }

    // false
    if(search_params.has('type')) {
    //
    }

    req.query

    File Name :

    var id = req.query.id; // $_GET["id"]

    ######################## OR ###################### var url = require('url');
    var params = url.parse(request.url, true);
    var query = params.query;

    File Name :

    app.get('/user/:id', function(req, res) {
    res.send('user' + req.params.id);
    });





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