ExpressJs Overview

Syntax

The basic syntax of ExpressJs is:

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

Example

Here is a simple example of an ExpressJs server:

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

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

app.listen(3000, () => {
  console.log('Server running on port 3000');
});

Output

If you run the above server and access http://localhost:3000/ in your browser, you will see "Hello World!" displayed on the page.

Explanation

ExpressJs is a web application framework for NodeJs. It provides a set of functions and middleware that makes it easier to build web applications.

In the example above, we are creating a new ExpressJs application and defining a route for the root path (/). When a user requests this path, the server sends back the text "Hello World!" as the response.

Use

ExpressJs can be used for building web applications and APIs. It provides tools for handling HTTP requests and responses, routing, middleware, and more.

Important Points

• ExpressJs is a web application framework for NodeJs
• It provides a set of functions and middleware for building web applications
• ExpressJs can be used for building web applications and APIs
• ExpressJs provides tools for handling HTTP requests and responses, routing, middleware, and more

Summary

ExpressJs is a popular web application framework for NodeJs. It provides a set of functions and middleware that make it easier to build web applications and APIs. ExpressJs is widely used for its simplicity, flexibility, and powerful features.