Understanding kill-port-process

The kill-port-process utility is an efficient tool designed for terminating processes that are bound to specific network ports on a machine. It’s widely used for freeing up ports that are currently being utilized by applications, which can be particularly handy during development and troubleshooting.

Basic Usage

To kill a process running on a specific port, you can use the following command:

  kill-port 3000

Advanced Usage and API Examples

There are several APIs provided by the kill-port-process that can be utilized for different purposes:

Killing Multiple Ports

You can terminate processes on multiple ports simultaneously with a single command:

  kill-port 3000,3001,3002

Killing Ports with a Range

Another useful feature is the ability to specify a range of ports to be killed:

  kill-port 3000-3005

Force Killing Using UDP and TCP

The tool allows for the forceful termination of processes using both UDP and TCP protocols:

  kill-port --udp 8080
  kill-port --tcp 9090

Comprehensive App Example

Here is an example of a simple Node.js application that initializes the kill-port-process to manage port conflicts:

  const http = require('http');
  const killPort = require('kill-port');

  const PORT = 3000;

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

      server.listen(PORT, () => {
        console.log(`Server running at port ${PORT}`);
      });
    })
    .catch((err) => {
      console.error(`Error killing port ${PORT}:`, err);
    });

This example demonstrates how to kill any process on port 3000 before starting a new HTTP server on that port, ensuring no port conflicts occur.

Utilizing kill-port-process effectively can save developers from common network-related issues during the development cycle.

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