What are exit codes in Node.js and what do they indicate?

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Exit codes are numeric values returned by a Node.js process when it terminates. They tell the OS (or parent process) whether the process exited successfully or due to an error . 0 — success, normal exit. Non-zero — some kind of error or abnormal termination. Know the difference between process.exit() and process.exitCode. The preference for exitCode over exit() shows you understand graceful shutdown practices.