Express.js Introduction Notes

Express is a popular web application framework for Node.js, known for its simplicity and versatility.

Introduction to Express.js

1. Express.js is a web application framework for Node.js
2. It provides a set of features for building web applications and APIs
3. It is built on top of Node.js and uses its non-blocking, event-driven architecture
4. Express.js helps in organizing the web application's routing logic, handling HTTP requests and responses, managing middleware functions, and rendering views
5. t allows for easy configuration and customization of the web application
6. Express.js provides various methods and functions to handle routing, including GET, POST, PUT, DELETE, etc.
7. Express.js allows for the use of middleware functions to handle common tasks like logging, authentication, and error handling
8. It has a large and active community that contributes to its development and provides a wide range of resources and plugins for extending its functionality.

Setting Up Express

1. To get started, create a new Node.js project and install the Express package:

npm init
npm install express
    

Creating a Basic Server

1. You can create a basic Express server using just a few lines of code.

const express = require('express');
const app = express();
const port = 3000;

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