localhost:3000

The port number 3000 is not officially assigned by any application, but many different server software or application development platforms can use it on localhost by default. In terms of both TCP and UDP port, your thousandth port is usually down and unavailable. You can activate and use it whenever you want. Sometimes 2999 or 30001 port range can be used instead of this port. Especially in application development environments, platforms such as React, NodeJs, Wamp, Xammp, ISS on your local server use http://localhost:3000/ or http://127.0.0.1:3000/ by default because they are free. You can quickly access this address from the link above.

Can't access to http://localhost:3000/ address

First of all, if you are having trouble accessing, try whether this port is open or not. On Windows systems open Command Promt (cmd.exe) Run as Administrator and write "netstat -ab"

On Linux or Unix, you must usage the "netstat -tulpn | grep LISTEN" commant on terminal window.
If the port is closed, enable it and also allow this port number in the Firewall settings.

How to create Simplest node.js http server (http://localhost:3000)

To create the simplest Node.js HTTP server listening on port 3000, you can follow these steps:

1. Create a new directory for your project and navigate into it using your terminal/command prompt.

 
mkdir my-node-server
cd my-node-server

2. Initialize a new Node.js project by running npm init and following the prompts.

 
npm init

3. Install the http module by running the following command:

 
npm install http

4. Create a new file named server.js in your project directory, and add the following code to create an HTTP server:

 
const http = require('http');

const server = http.createServer((req, res) => {
  res.statusCode = 200;
  res.setHeader('Content-Type', 'text/plain');
  res.end('Hello, World!\n');
});

server.listen(3000, () => {
  console.log('Server running at http://localhost:3000/');
});

5. Start the server by running the following command in your terminal/command prompt:

 
node server.js

6. Open your web browser and navigate to http://localhost:3000/. You should see a message that says "Hello, World!".

That's it! You've created a simple Node.js HTTP server listening on port 3000. You can modify the server response or add more routes and functionality as per your requirements.

Localhost & Your connection Analysis (live)

127.0.0.1 Server Pages

Ports:
localhost:81 ⟷ localhost:631 ⟷ localhost:9000 ⟷ localhost:4000 ⟷ localhost:11501 ⟷ localhost:8001 ⟷ localhost:3306

Folders:
localhost/dashboard ⟷ localhost/wordpress ⟷ localhost/wordpress/wp-admin ⟷ http://localhost/mysql