Mastering child_process in Node.js: The Secret Weapon for CLI Tools

Mastering child_process in Node.js: The Secret Weapon for CLI Tools If you have ever built a CLI tool in Node.js, you have probably reached a point where you needed to shell out to another command. Maybe you wanted to run git log , invoke ffmpeg , or orchestrate a build pipeline. That is where child_process comes in — Node's built-in module for spawning subprocesses. It is one of the most powerful and underused modules in the standard library. In this guide, we will go deep on every method child_process offers, when to pick each one, and how to combine them to build production-grade CLI tools that feel native. The Four Methods: exec, execSync, spawn, and fork The child_process module gives you four primary ways to run external commands. Each has a distinct personality. exec — Buffered Output, Shell Enabled exec runs a command inside a shell ( /bin/sh on Unix, cmd.exe on Windows) and buffers the entire output in memory before handing it to your callback. const { exec } = require ( ' chi