Total Requests
124,891
+12% today
Error Rate
0.8%
-3% today
Avg Latency
62ms
+2ms today
Slow Requests
43
-18% today
Learn how to monitor API performance in real-time. Add your API key and get Express API monitoring with charts, request logs, DB query profiling, error tracking, and Node.js API performance optimization. Free during beta.
Real-time KPIs, request volume, latency percentiles, status distribution - all in one glance.
How to monitor API performance without a 200-page setup guide? One line of middleware. Express API monitoring and Node.js API performance optimization — out of the box.
Every HTTP request logged with method, path, status, latency, and trace ID. Structured JSON, filterable instantly.
4xx and 5xx errors tracked separately. Know the difference between a bad request and a broken endpoint.
Slow endpoints surface automatically. Any request over your threshold is flagged before users start complaining.
Each request gets a unique trace ID. Pass it downstream to correlate logs across services without any extra setup.
Wrap your queries with trackDbCall() to see how many DB calls each request triggers. Catch N+1 before they hurt.
Traffic broken down by route, not just by URL. See which endpoints are hot, slow, or broken - aggregated by minute.
This is what your console outputs for every request. Method, route, status, latency, trace ID, and every DB query - automatically.
Auto-generated UUID that follows the request across microservices via x-trace-id header.
Every SQL query captured with masked values, source library, and execution time. Zero code changes.
Millisecond-precise timing. Requests above your threshold are flagged as slow automatically.
See "dbCalls: 47" on one endpoint? You've got an N+1 problem. Spot it instantly.
From npm install to seeing your first request in the dashboard - under 60 seconds.
One command. Zero dependencies. No native modules.
$ npm install auto-api-observeSign up at apilens.rest to get your API key. Works with Express & Fastify.
$ app.use(observe({ apiKey: 'sk_...' }));Dashboard lights up. Every request, every query, every error - live.
Looking for an alternative to New Relic or Datadog? The best Express JS API monitoring tools don't need an agent, YAML files, or a $23/month bill.
| Feature | APILens | Datadog | New Relic | Sentry |
|---|---|---|---|---|
| Setup time | 10 seconds | 30+ min | 30+ min | 15+ min |
| Lines of code | 1 | 20+ | 15+ | 10+ |
| Dependencies | 0 | 50+ | 40+ | 30+ |
| Auto DB profiling | ||||
| Distributed tracing | ||||
| Error tracking | ||||
| Latency metrics | ||||
| N+1 detection | ||||
| Real-time dashboard | ||||
| Config required | None | Agent + YAML | Agent + config | DSN + config |
| Price | Free (beta) | $23/host/mo | $0.30/GB | $26/mo |
Practical guides on API performance, Node.js optimization, and database monitoring.
All features included. No credit card. No limits during beta. Just sign up and start monitoring your API in 60 seconds.
Everything included. We'll notify you before pricing changes.
Questions? Reach out at hello@apilens.rest
200+ developers already monitoring their APIs. Get your API key in 10 seconds. Free during beta.
No credit card · No agents · Works in 60 seconds
Tech Lead & Full-Stack Developer with 12+ years of experience. Got tired of paying $23/mo for Datadog just to see which endpoint was slow. So I built APILens — API observability that takes 60 seconds, not 60 minutes.
Solo dev. Every line of code — middleware, backend, dashboard, billing — written by one person.
200+
npm installs
44
tests passing
1
developer