What methods and tools can be used to determine the performance of an application developed on Node.js?

To evaluate the performance of a Node.js application, the following methods and tools can be used:

• Built-in perf_hooks module — allows measuring function and event execution times.

• Profiling with node --prof — generates a performance profile that can be analyzed with node --prof-process.

• Chrome DevTools tools — connect to Node.js via inspector (node --inspect) and use the profiling tab to analyze CPU and memory.

• Monitoring and profiling packages:

  • clinic.js — a set of tools for performance diagnostics.
  • pm2 — process manager with monitoring.
  • newrelic, appdynamics — commercial APM tools.

• Manual timing logs — manually measure execution time of critical code sections using console.time and console.timeEnd.

Example of using perf_hooks:

const { performance } = require('perf_hooks');

const start = performance.now();
// code to measure
someFunction();
const end = performance.now();
console.log(`Execution time: ${end - start} ms`);