Path and Query Parameters

Path Params:

Path params is the variable part of the URL like /:id where you can print the details of a class based on its id. consider the below example where you are passing the number and you are accesing it in code using req.params.

Test it by hitting the url http://localhost:2000/square/3.

Query Params:

Query params is a powerful query method where you will display a page based on a query. Consider the below example where you are passing the name as foo and you access it in code using req.query.

Test it by hitting the url http://localhost:2000/hello?name=foo

const express = require('express');
const server = express();

server.get('/', (req, res) => {
    res.send('Hello World');
});

// query params
server.get('/hello', (req, res) => {
    let name = req.query.name || 'NA';
    res.send(`Hello ${name}`);
});

//path params
server.get('/square/:number', (req, res) => {
    let number = parseInt( req.params.number );
    res.send(`Square is ${ number ** 2}`);
});

server.listen(2000,()=>console.log('server started on 2000'));