How do you detect performance issues (spikes, memory leaks, delays) in a Node.js application?

Several approaches are used to detect performance issues in a Node.js application:

• CPU and memory profiling: using the built-in Node.js profiler (--inspect), Chrome DevTools, or tools like Clinic.js to identify bottlenecks and leaks.
• Metrics monitoring: collecting metrics (latency, memory usage, number of open connections) with Prometheus, Grafana, or New Relic.
• Logging and tracing: analyzing logs and distributed tracing to understand where delays occur.
• Heap snapshots: taking heap snapshots and comparing them to find memory leaks.

Example of starting the profiler:

node --inspect app.js

Then connect via Chrome DevTools for analysis.