Introduction to Express.js – Coding in Telugu

Express.js is a web application framework for Node.js. It simplifies building web applications by providing a set of tools for handling routes, requests, and responses.

Setting up a Basic Express.js Application:

• Install Express.js using npm: npm install express.
• Create a simple server using express().

// Example: Setting up a Basic Express.js Application
const express = require('express');
const app = express();
const port = 3000;

app.get('/', (req, res) => {
    res.send('Hello, Express!');
});

app.listen(port, () => {
    console.log(`Express app listening at http://localhost:${port}`);
});

Routing in Express.js:

• Define routes using HTTP methods (GET, POST, etc.).
• Use route parameters for dynamic URL segments.

// Example: Routing in Express.js
app.get('/about', (req, res) => {
    res.send('About Us Page');
});

app.get('/user/:id', (req, res) => {
    const userId = req.params.id;
    res.send(`User ID: ${userId}`);
});

Middleware and its Role in Express.js:

• Middleware functions have access to the request, response, and the next middleware function.
• Common middleware include express.json() for parsing JSON and express.urlencoded() for parsing URL-encoded data.

// Example: Using Middleware in Express.js
app.use(express.json());
app.use(express.urlencoded({ extended: true }));

app.use((req, res, next) => {
    console.log('Request Time:', Date.now());
    next();
});

Q: What is Express.js, and how does it relate to Node.js?
A: Express.js is a web application framework for Node.js, providing a set of features for building robust and scalable web applications.

Q: How do you set up a basic Express.js application?
A: Install Express.js using npm (npm install express) and create a server using express().

Q: Explain the role of middleware in Express.js.
A: Middleware functions in Express.js have access to the request, response, and the next middleware function, allowing for custom processing in the request-response cycle.

Express.js web application development
Setting up Express.js server
Routing in Express.js tutorial
Dynamic URL segments in Express.js
Middleware functions in Express.js

Express.js common middleware examples
Express.js JSON parsing middleware
Building scalable web applications with Express.js
Introduction to Express.js for beginners
Express.js server configuration tips

Introduction to Express.js – Learn Coding in Telugu, Learn Programming in Telugu, Learn Node Js in Telugu, Learn JavaScript in Telugu