Observe and document
your APIs automatically.
Production-ready logs and live API docs for Express — from real traffic and real routes. No decorators. No schemas. No duplicate work.
Why choose Tracelet
One integration. One UI.
Production ready
Ship without maintaining three separate tools. One integration, one UI.
Dark mode compatible
Full light and dark theme support. Matches your environment.
Logs · Docs
Two capabilities in one place. Always in sync with your API.
Built for developers
No route changes, no type hacks, no extra build step. Opt-in and runtime-aware.
TypeScript based
Express-native, type-safe, and designed for modern Node apps.
Copy & paste setup
Install, mount, run. Everything appears at /tracelet-docs.
What problem does Tracelet solve?
APIs don't fail because of code — they fail because of visibility gaps.
- Logs live in one place
- Docs live in another
- None of them stay in sync
Every tool asks you to describe your API again. Tracelet watches your API instead.
What is Tracelet?
Tracelet is a runtime API observability layer for Express apps. It provides:
- API Documentation
- Structured Request & Response Logs
All from the same source of truth: your running Express application.
How Tracelet works
1. Plug it into Express
useTracelet(app, {
serviceName: "payments",
environment: "dev",
});2. Tracelet observes routes & traffic
- HTTP method & full path
- Request body & headers
- Response status & shape
- Execution metadata
3. Everything appears in one UI
Logs · Docs. Available instantly at:
/tracelet-docsTwo core capabilities
Designed for developers
- No changes to route signatures
- No Express type hacks
- No additional build step
- Works with monorepos
- Safe for local & internal environments
Tracelet is opt-in, runtime-aware, and non-intrusive.
Typical use cases
- Local development visibility
- Internal service documentation
- Debugging request/response issues
- Frontend ↔ backend collaboration
- Onboarding new engineers
- Microservice observability
Architecture-friendly by design
- Express-native
- TypeScript-first
- No vendor lock-in
- Metadata is exportable
- UI runs on the same port as your API
The larger picture
“In a world of scarcity, we treasure tools. In a world of abundance, we treasure taste.”
Don't document APIs. Observe them. Tracelet turns your API into its own documentation and logging system.