What is the purpose of the process object in Node.js?

Question

Accepted Answer

The process object is a global object that provides information about — and control over — the currently running Node.js process. It's the main interface between your app and the runtime environment. Common uses: process.env — access environment variables (e.g., process.env.NODE_ENV ). process.argv — read command-line arguments. process.cwd() — get the current working directory. process.exit(code) — terminate the process with an exit code. process.pid — current process ID. process.platform / process.arch — OS and CPU info. process.memoryUsage() — memory stats for monitoring. process.uptime() — how long the process has been running. process.stdin / stdout / stderr — standard I/O streams. Event handling: process.on('exit') — cleanup before shutdown. process.on('uncaughtException') — catch unhandled errors. process.on('unhandledRejection') — catch unhandled promise rejections. process.on('SIGINT' / 'SIGTERM') — handle graceful shutdown (Ctrl+C, Docker stop). Focus on practical uses: environment variables, graceful shutdown with signal handling, and memory monitoring. These show production-level awareness.