Introduction to ps-node

ps-node is a popular library for performing process management in Node.js applications. It offers various APIs for listing, querying, and killing system processes. This guide provides a comprehensive overview of ps-node’s features and demonstrates how to use them with code snippets to optimize process management in your Node.js projects.

Installation

  
    npm install ps-node
  

API Explanations and Examples

Listing Processes

This API lists all the processes currently running on your system.

  
    const ps = require('ps-node');

    // List all processes
    ps.lookup({}, (err, resultList) => {
        if (err) {
            throw new Error(err);
        }

        resultList.forEach((process) => {
            console.log(process);
        });
    });
  

Finding Process by PID

Locate specific processes using their PID.

  
    const ps = require('ps-node');

    // Find process by PID
    let pid = 12345;

    ps.lookup({ pid: pid }, (err, resultList) => {
        if (err) {
            throw new Error(err);
        }

        resultList.forEach((process) => {
            console.log(process);
        });
    });
  

Finding Process by Command

Locate processes based on their command name.

  
    const ps = require('ps-node');

    // Find process by command
    let command = 'node';

    ps.lookup({ command: command }, (err, resultList) => {
        if (err) {
            throw new Error(err);
        }

        resultList.forEach((process) => {
            console.log(process);
        });
    });
  

Killing a Process

Terminate a process by its PID.

  
    const ps = require('ps-node');

    // Kill a process by PID
    ps.kill(12345, (err) => {
        if (err) {
            throw new Error(err);
        }

        console.log('Process killed!');
    });
  

Example Application

Here is a small application showcasing the above APIs for better understanding.

  
    const ps = require('ps-node');

    // Function to list processes
    function listProcesses() {
        ps.lookup({}, (err, resultList) => {
            if (err) {
                throw new Error(err);
            }

            resultList.forEach((process) => {
                console.log(process);
            });
        });
    }

    // Function to find and kill node processes
    function findAndKillNodeProcesses() {
        ps.lookup({ command: 'node' }, (err, resultList) => {
            if (err) {
                throw new Error(err);
            }

            resultList.forEach((process) => {
                ps.kill(process.pid, (err) => {
                    if (err) {
                        throw new Error(err);
                    }

                    console.log(`Process ${process.pid} killed!`);
                });
            });
        });
    }

    // Execute the functions
    listProcesses();
    findAndKillNodeProcesses();
  

By using ps-node, you can efficiently manage processes in your Node.js applications, ensuring better performance and resource utilization.

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