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child process in node js

Abhishek answered on February 8, 2022 Popularity 10/10 Helpfulness 2/10

answer child process in node js

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child process in node js

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Node.js Child Process is a built-in module that enables a Node.js process to spawn child processes and communicate with them via standard input/output streams.

In simpler terms, the Child Process module allows a Node.js application to run other programs (child processes) alongside the main process, and communicate with them.

For example, let's say you have a Node.js application that needs to perform a long-running operation, such as running a Python script, but you don't want to block the main process. You can use the Child Process module to spawn a new child process to run the Python script while the main process continues to execute.

The Child Process module provides several functions for spawning child processes, including spawn, exec, execFile, and fork.

spawn: Spawns a child process and returns a ChildProcess object that provides streams for stdin, stdout, and stderr.

exec: Spawns a shell and runs a command within that shell, buffering the output in memory and returning the output when complete.

execFile: Similar to exec, but allows you to specify the command as an array of arguments instead of a single string.

fork: Similar to spawn, but specifically designed for spawning child processes that are Node.js modules.

Once you have spawned a child process, you can communicate with it using the stdin, stdout, and stderr streams. For example, you can send data to the child process using the stdin stream, and read data from the child process using the stdout and stderr streams.

* Overall, the Child Process module is a powerful tool for running external programs and communicating with them within a Node.js application.

Popularity 10/10 Helpfulness 2/10 Language javascript

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Tags: child-process javascript

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Contributed on Feb 20 2023

Abhishek

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const { spawn } = require('child_process');
const ls = spawn('ls', ['-lh', '/usr']);

ls.stdout.on('data', (data) => {
  console.log(`stdout: ${data}`);
});

ls.stderr.on('data', (data) => {
  console.error(`stderr: ${data}`);
});

ls.on('close', (code) => {
  console.log(`child process exited with code ${code}`);
});

Popularity 10/10 Helpfulness 4/10 Language javascript

Source: Grepper

Tags: javascript j

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Contributed on Feb 08 2022

Undefined

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child process in node js

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