What Is API Monitoring?

Direct answer

API monitoring sends automated requests to HTTP APIs (REST/JSON commonly, GraphQL where configured) and validates responses: status codes, headers, latency, and optionally JSON fields or schemas. It proves your contract with clients and catches auth, routing, and dependency failures early.

Key points

• Assertions: Beyond “200 OK”—check payload shape, required keys, and error formats.
• Auth: Rotate test credentials safely; avoid embedding long-lived secrets in client-side code.
• Dependencies: Failures may be downstream (database, payment provider); store correlation IDs in responses where possible.

Multi-step flows

Some checks chain calls (token → action → verify). Keep tests minimal and stable; flaky tests erode trust in monitoring.

Limitations

Synthetic checks do not capture every real user permutation; combine with real traffic metrics and error budgets where available.

Frequently asked questions

POST vs GET monitoring?

Use the smallest safe method that exercises production paths; some teams prefer dedicated “synthetic” endpoints with strict auth.

How do I avoid mutating data?

Prefer read-only endpoints, dedicated test tenants, or idempotent operations with cleanup procedures.