bash
node --max-old-space-size=4096 app.jsNotes
Common for builds, SSR, and memory-heavy workloads.
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
Tune heap sizes and collect performance data.
bash
node --prof app.jsNotes
Useful in performance debugging workflows.
bash
node --cpu-prof app.jsNotes
Modern performance workflow for realistic workloads.
bash
node --heap-prof app.jsNotes
Helpful when tracking memory growth and allocations.
bash
node --heapsnapshot-signal=SIGUSR2 app.jsNotes
Useful for long-running services where you want snapshots without stopping the process.
bash
node --trace-gc app.jsNotes
Helpful when investigating memory pressure or GC pauses.
bash
NODE_V8_COVERAGE=./coverage node app.jsNotes
Useful for diagnostics or integrating with coverage tooling.
Enable source maps in stack traces
Map stack traces back to original sources.
bashANYnodesource-maps
bash
node --enable-source-maps dist/server.jsNotes
Important for transpiled TypeScript or bundled code.
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Node.js CLI environment and config cheat sheets for NODE_OPTIONS, runtime environment variables, proxy settings, CA certificates, and launch patterns.
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