The os module provides operating system utilities for accessing system information, CPU data, memory stats, and more. Here's how to use it.
Basic System Info#
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CPU Information#
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Memory Information#
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Network Interfaces#
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User Information#
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System Uptime and Load#
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Constants#
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Process Priority#
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System Monitor#
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Cross-Platform Paths#
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Best Practices#
Usage:
✓ Cache static values
✓ Handle platform differences
✓ Use constants for signals/errors
✓ Format bytes for display
Performance:
✓ Avoid polling too frequently
✓ cpus() can be expensive
✓ Cache network interfaces
✓ Use async alternatives when available
Cross-Platform:
✓ Check platform for platform-specific code
✓ Use path.join for file paths
✓ Handle missing features gracefully
✓ Use os.EOL for line endings
Avoid:
✗ Assuming Unix-only features
✗ Ignoring permission errors
✗ Blocking with frequent calls
✗ Hardcoding platform values
Conclusion#
The os module provides essential system information for Node.js applications. Use it for monitoring resources, configuring platform-specific behavior, and accessing user information. Remember that some features like load average are Unix-specific, and always handle cross-platform differences gracefully. For performance monitoring, cache static values and avoid polling too frequently.