About Node.js

Node.js is a JavaScript runtime built on Chrome's V8 JavaScript engine. It allows developers to run JavaScript code outside of a browser, enabling server-side scripting and building scalable network applications.

About npm init

npm init is a command used to create a new package.json file for a Node.js project. The package.json file contains metadata about the project, such as its name, version, dependencies, and scripts. Running npm init helps set up and manage your Node.js project's configuration.
npm init -y is a command used to quickly create a new package.json file for a Node.js project with default values. This saves time by skipping the interactive prompts. The package.json file contains metadata about the project, such as its name, version, dependencies, and scripts.

package used - express: npm install express default stater code:

            const express = require('express');
            const app = express();
            const PORT = process.env.PORT || 3000;

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

            app.listen(PORT, () => {
                console.log(`Server is running on http://localhost:${PORT}`);
            });
        

- mongoose: npm install mongoose