Node.js CLI Performance & Profiling

Node.js CLI performance cheat sheets for memory tuning, CPU profiling, heap analysis, coverage, and source-map-aware debugging.

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## Memory, Profiling, and Coverage

Increase max old space size

node --max-old-space-size=4096 app.js

# Raise the V8 heap ceiling in MiB.

Generate V8 profile log

node --prof app.js

# Record profiling output for CPU analysis.

Generate CPU profile

node --cpu-prof app.js

# Collect a CPU profile for DevTools analysis.

Generate heap profile

node --heap-prof app.js

# Record heap allocation data.

Write heap snapshot on signal

node --heapsnapshot-signal=SIGUSR2 app.js

# Generate heap snapshots on demand.

Trace GC activity

node --trace-gc app.js

# Print V8 garbage collection events.

Write V8 coverage output

NODE_V8_COVERAGE=./coverage node app.js

# Collect coverage JSON into a directory.

Enable source maps in stack traces

node --enable-source-maps dist/server.js

# Map stack traces back to original sources.

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