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What does the node:os module provide, and what are some commonly used functions from it?

Beginner

Answer

os exposes OS-level info: platform() (OS name), cpus() (core details), totalmem()/freemem() (memory stats), homedir(), and tmpdir() -- useful for cross-platform scripts, sizing worker pools, and diagnostic logging.
console.log('Platform:', os.platform());
console.log('Free memory (GB):', (os.freemem() / 1e9).toFixed(2));
Real-world example A monitoring script logs os.freemem() and os.cpus().length to help diagnose whether periodic slowdowns stem from low memory or insufficient CPU cores.

Common follow-ups: How does os.tmpdir() behave differently across Windows, macOS, and Linux?;What's the difference between os.uptime() and process.uptime()?

Path & OS Modules;CLI Tools & Scripting with Node.js
All 15 Core Node.js Modules questions