Introduction to Node.js and Express

Node.js is a JavaScript runtime built on Chrome's V8 JavaScript engine that allows developers to create scalable and high-performance server-side applications. Express is a popular Node.js framework for building web applications and APIs.

Step 1: Install Node.js and Express

To start, you need to have Node.js installed on your machine. You can download the latest version from the official Node.js website. Once installed, open your terminal and run the following command to create a new Node.js project:

mkdir my-api
npm init -y``
## Step 2: Install Express
Next, install Express using npm by running the following command:
```bash
npm install express``
## Step 3: Create a Simple RESTful API
Create a new file called `app.js` and add the following code to create a simple RESTful API:
```javascript
const express = require('express');
const app = express();
const port = 3000;

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

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

Step 4: Run the Application

Run the application using the following command:

node app.js``
Open your web browser and navigate to `http://localhost:3000` to see the 'Hello World!' message.
# Conclusion
In this tutorial, you learned how to create a simple RESTful API using Node.js and Express. You can build upon this example to create more complex APIs and web applications.