How to get the process details in node.js
Retrieving process details in node.js is easier than you think. We will be using ps-list package for this tutorial. If you don’t have ps-list already installed in your node.js, install it using the following command.
npm install ps-list
Retrieving all process details together as an object using psList()
//accessing ps-list module
const psList = require('ps-list');
//calling psList()
psList().then(data => {
//printing returned object
console.log(data);
});the output for the above code snippet will contain an array, each of the elements of it will contain attributes like pid, name, cmd, cpu, etc. Sample output is given below (in windows)
[ { name: '[System Process]', pid: 0, ppid: 0 },
{ name: 'System', pid: 4, ppid: 0 },
{ name: 'Registry', pid: 96, ppid: 4 },
{ name: 'smss.exe', pid: 400, ppid: 4 },
{ name: 'csrss.exe', pid: 644, ppid: 632 },
{ name: 'wininit.exe', pid: 756, ppid: 632 },
{ name: 'services.exe', pid: 828, ppid: 756 },
{ name: 'lsass.exe', pid: 836, ppid: 756 },
{ name: 'fontdrvhost.exe', pid: 1000, ppid: 756 },
{ name: 'WUDFHost.exe', pid: 588, ppid: 828 },
{ name: 'svchost.exe', pid: 568, ppid: 828 },
{ name: 'dasHost.exe', pid: 1932, ppid: 1852 },
{ name: 'svchost.exe', pid: 1980, ppid: 828 },
{ name: 'svchost.exe', pid: 2436, ppid: 828 },
{ name: 'atiesrxx.exe', pid: 2528, ppid: 828 },
{ name: 'svchost.exe', pid: 2632, ppid: 828 },
... 216 more items ]example 2: retrieving data from the returned object
//accessing ps-list module
const psList = require('ps-list');
//calling psList()
psList().then(data => {
//walking through returned object
data.forEach(function(element){
console.log("name:"+String(element.name)+" pid:"+String(element.pid));
});
});output for the above code snippet
name:[System Process] pid:0 name:System pid:4 name:Registry pid:96 name:smss.exe pid:400 name:csrss.exe pid:644 name:wininit.exe pid:756 name:services.exe pid:828 name:lsass.exe pid:836 name:svchost.exe pid:960 name:svchost.exe pid:980 name:fontdrvhost.exe pid:1000 name:WUDFHost.exe pid:588 name:svchost.exe pid:568 . . 216 more
retrieving the priority of the process.
//allocating os module
const os = require('os');
//accessing ps-list module
const psList = require('ps-list');
//calling psList
psList().then(data => {
//waling through returned object i.e. data
data.forEach(function(element){
//try catch for handling error from os.getPriority()
try{
//retrieving priority
var priority=os.getPriority(element.pid);
console.log("name:"+String(element.name)+" pid:"+String(element.pid)+" priority:"+String(priority));
}catch(err){
//a blank catch block
//console.log(err);
}
});
});
output for the above code snippet
name:[System Process] pid:0 priority:0 name:SynTPEnh.exe pid:10376 priority:-7 name:sihost.exe pid:9580 priority:0 name:ctfmon.exe pid:13568 priority:-14 name:ShellExperienceHost.exe pid:4032 priority:0 name:SynTPHelper.exe pid:4216 priority:-7 name:SettingSyncHost.exe pid:13748 priority:10 name:LockApp.exe pid:3244 priority:0 name:CastSrv.exe pid:5364 priority:0 name:RuntimeBroker.exe pid:3292 priority:0 name:WindowsInternal.ComposableShell.Experiences.TextInput.InputApp.exe pid:10884 priority:0 name:GameBar.exe pid:12732 priority:0 name:RuntimeBroker.exe pid:11400 priority:0 name:GameBarFT.exe pid:3904 priority:0 name:RuntimeBroker.exe pid:13264 priority:0 name:Video.UI.exe pid:12736 priority:0 name:RuntimeBroker.exe pid:9624 priority:0 name:Calculator.exe pid:13004 priority:0 name:chrome.exe pid:4336 priority:0 name:chrome.exe pid:5312 priority:-7 name:chrome.exe pid:9704 priority:0 name:chrome.exe pid:13688 priority:19 name:chrome.exe pid:6636 priority:0 name:audiodg.exe pid:7524 priority:0 name:CompPkgSrv.exe pid:3336 priority:0 name:notepad++.exe pid:1072 priority:0 name:cmd.exe pid:2804 priority:0 name:conhost.exe pid:14256 priority:0 name:chrome.exe pid:3288 priority:19 name:RuntimeBroker.exe pid:6260 priority:0 name:node.exe pid:14284 priority:0
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