how to create child process in nodejs

how to create child process in nodejs

Child Process can be created in NodeJS by various ways.
1. Fork
2. Spawn

When child process is getting created, the PPID of the child process will be the PID of the parent process

Child.js

var sleep=require("sleep");
while(1){
console.log(" I m child process");
sleep.sleep(1);
}

Parent.js  [ Via Fork ]

const  spawnObj = require('child_process');
const child = spawnObj.fork('/home/user1/test/child.js');

This will create a child process. But you cannot have control over the input / output / error streams of the child process

Parent.js  [ Via Spawn]

const  spawnObj = require('child_process');

var cmd="/home/user1/test/child.js";
var child = spawnObj.spawn("node",[cmd], {detached: false});


 child.stdout.on('data', function (data) {
      console.log('stdout: ' + data);
   });

 child.stderr.on('data', function (data) {
      console.log('stderr: ' + data);
   });
.