No credit cardInstant setupFree forever on the free tier
Total Requests
124,891
+12% today
Error Rate
0.8%
-3% today
Avg Latency
62ms
+2ms today
Slow Requests
43
-18% today
Works with every Node.js framework
Auto-profiles 9 database libraries
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.
One package. 12 frameworks. 9 DB libraries. Zero runtime dependencies. Ships to your cloud dashboard in under 60 seconds.
Every request logged with method, route pattern, status, latency, trace ID, IP, and User-Agent. Structured JSON, instantly searchable.
4xx and 5xx errors tracked and charted separately. Know the difference between a bad request and a broken endpoint.
Requests over your threshold are flagged automatically. P95 latency per route, without any extra setup.
Patches 9 libraries (pg, mysql2, mongoose, Prisma, Knex, Sequelize, ioredis, better-sqlite3, node-redis). Per-query timing, masked SQL, N+1 detection.
Every fetch, axios, and undici call your server makes is captured per-request. See which third-party APIs are adding latency.
authorization, password, token, api_key, cookie, and 15 more keys are auto-redacted before shipping. Case-insensitive.
Attach service, env, region, or version to every log entry for instant dashboard filtering across projects.
Memory (rss, heap), CPU (user, system), and load average sampled on an interval and shipped alongside your request data.
UUID trace ID per request, forwarded via x-trace-id. Correlate logs across services without any extra infrastructure.
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.
From solo devs to platform teams, engineers use APILens to find performance issues that would otherwise take hours to diagnose.
350+
npm installs
60s
avg setup time
0
runtime dependencies
12
frameworks supported
“Dropped it into our Express app before a production deploy. By the time I finished my coffee, I could see every slow endpoint and which DB queries were causing them. Took literally 90 seconds.”
Marcus D.
Senior Backend Engineer · Fintech startup
“We were paying $800/mo for New Relic and using maybe 10% of what it offered. APILens does exactly the 10% we actually need, for free. The zero-dependency thing is a huge deal for us.”
Priya S.
Platform Lead · SaaS company
“The N+1 detection caught a query loop in our user endpoint that was adding 400ms. Found it in 5 minutes. We've had that bug for months and never saw it in logs.”
James O.
Full-stack dev · Agency
“I love that it works with Fastify out of the box. Most observability tools treat Express as the only framework that exists. APILens just works.”
Sofia K.
Node.js developer · E-commerce platform
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 | SigNoz |
|---|---|---|---|---|---|
| Setup time | 60 seconds | 30+ min | 30+ min | 15+ min | 30-60 min |
| Lines of code | 1 | 20+ | 15+ | 10+ | 10-20 |
| Dependencies | 0 | 50+ | 40+ | 30+ | 5+ (OTel SDK) |
| Infrastructure | None | Agent | Agent | None | Docker+ClickHouse |
| Auto DB profiling | |||||
| Distributed tracing | |||||
| Error tracking | |||||
| N+1 detection | |||||
| Real-time dashboard | |||||
| Self-hostable | |||||
| Price | Free (beta) | $31/host/mo | $49/user/mo | $26/mo | Free (self-host) |
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 30 days before pricing changes.
After beta — planned pricing
$0/mo
Hobby
500k req/mo
$19/mo
Starter
5M req/mo
$49/mo
Pro
25M req/mo
$149/mo
Scale
100M req/mo
Need more? Contact us for enterprise limits, SLAs, and on-premises options. Or see full pricing including top-up packs.
Frequently asked
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
“
Got tired of paying $23/mo for Datadog just to see which endpoint was slow. Every tool either needed a YAML file, a sidecar agent, or a $49/seat bill. So I built APILens — API observability that takes 60 seconds to set up, not 60 minutes.
Solo dev. Every line — middleware, backend, dashboard, billing — written by one person.