How to use nodejs in cmd

Node.js is an open source Javascript runtime environment that allows developers to write server-side applications using Javascript. Node.js provides powerful features and extensibility with which you can create web applications, command line utilities, APIs, and other types of server-side applications. In this article, we will explain how to use Node.js in the Command Prompt (Cmd) of the Windows operating system.

1. Download and Install Node.js

First, we need to download and install Node.js on our Windows computer. Go to the official website to download the stable version. After the download is complete, run the installer, and then follow the instructions of the installer to complete the Node.js installation process. During the installation process, you may need to select the installation location of Node.js and other options.

2. Verify whether Node.js is installed correctly

After installing Node.js, we can verify whether Node.js is successfully installed in Cmd. Open a Windows command prompt and enter the following command:

node -v

If you see the output "v" followed by the version number of Node.js, then Indicates that Node.js has been successfully installed. If there is no such output, you need to reinstall Node.js or check for errors during the installation.

3. Writing and Running Node.js Applications

Once Node.js is successfully installed, we can start writing Node.js applications. Through Cmd, we can run our application using Node.js. It is important to note that in Node.js applications we need to write code using Javascript.

Open a new text file and copy the following code into the file:

var http = require('http');

http.createServer(function(req, res) {
    res.writeHead(200, {'Content-Type': 'text/plain'});
    res.end('Hello World
');
}).listen(8080, '127.0.0.1');

console.log('Server running at http://127.0.0.1:8080/');

The above code will start a simple HTTP server. The HTTP server listens on port 8080 and uses 127.0.0.1 as the server address on localhost. The server will return a "Hello World" message.

Now, we can save this file to our computer, for example, we can save it in the C:NodeJS directory and then rename it to "server.js". To run a Node.js application in Cmd, execute the following command:

node C:NodeJSserver.js

This will launch our Node.js application , and start running an HTTP server on our computer. The last line of output will tell us the address and port number of the server.

4. Exit the Node.js application

To exit the Node.js application, we just need to press the "Ctrl C" key combination in the command prompt. This will force the Node.js application to stop running.

Conclusion

In this article, we covered how to use Node.js from the command prompt in Windows. We learned how to download and install Node.js, how to verify that Node.js was successfully installed, and how to run a Node.js application. We also learned how to write a basic Node.js application and set up a simple HTTP server. By using Node.js, we can build powerful server-side applications using Javascript and extend Javascript into new technology areas.

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