flamegraph-middleware

import express from 'express'; import { createFlamegraphMiddleware } from 'flamegraph-middleware'; const app = express(); // Configure and use the flamegraph middleware // Access profiles at http://localhost:3000/flamegraph app.use(createFlamegraphMiddleware({ basePath: '/flamegraph', defaultDuration: 10000, // 10 seconds maxDuration: 60000, // Max 1 minute profile profileTTL: 300000 // Profiles expire after 5 minutes })); app.get('/', (req, res) => { res.send('Hello World! Access /flamegraph to start profiling.'); }); app.get('/slow', (req, res) => { let sum = 0; for (let i = 0; i < 1e7; i++) { sum += Math.sqrt(i); } res.send(`Computed sum: ${sum}. Profile this endpoint with /flamegraph?duration=5000`); }); const PORT = 3000; app.listen(PORT, () => { console.log(`Express server running at http://localhost:${PORT}`); console.log(`Start a profile: http://localhost:${PORT}/flamegraph?duration=5000`); console.log(`View results after profiling: http://localhost:${PORT}/flamegraph`); });