Setting up Development Environment

Setting up a development environment is the first step in building and deploying applications. It involves installing the necessary tools and frameworks for development.

Install Node.js and npm

Node.js is a JavaScript runtime that allows us to run JavaScript code on the server-side. npm (Node Package Manager) is a package manager for JavaScript.

To install Node.js and npm, follow these steps:

1. Visit the official Node.js website (https://nodejs.org/) and download the LTS version for your operating system.

2. Follow the installation instructions to install Node.js and npm.

3. Verify the installation by running the following commands in your terminal:

1node --version
2npm --version

You should see the version numbers of Node.js and npm printed to the console, indicating that the installation was successful.

Setting up a Project

Once you have Node.js and npm installed, you can set up a new project by following these steps:

1. Create a new directory for your project using the mkdir command. For example:

1mkdir my-project

2. Navigate to the project directory using the cd command. For example:

1cd my-project

3. Initialize a new project using npm by running the npm init command. This will start a wizard that will guide you through the process of initializing a new project. You can press enter to accept the default options or customize them as needed.

4. Install any dependencies that your project requires using the npm install command. For example, to install the Express.js framework, run the following command:

1npm install express

This will download and install the Express.js package into your project directory.

5. Create a file to start your application. For example, create a file called index.js and add the following code:

1const express = require('express');
2const app = express();
3
4app.get('/', (req, res) => {
5  res.send('Hello, World!');
6});
7
8app.listen(3000, () => {
9  console.log('Server is running on port 3000');
10});

This code sets up a simple Express.js server that listens on port 3000 and sends a 'Hello, World!' message when you visit the root URL (http://localhost:3000/) in your browser.

6. Start your application by running the following command in your terminal:

1node index.js

This will start the server, and you should see the message 'Server is running on port 3000' printed to the console.

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node --version

npm --version

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mkdir my-project

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cd my-project

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npm init

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npm install express

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const express = require('express');

const app = express();

​

app.get('/', (req, res) => {

  res.send('Hello, World!');

});

​

app.listen(3000, () => {

  console.log('Server is running on port 3000');

});

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node index.js