Best API Monitoring Tools 2026: By Test Depth
API monitors compared by ping vs assertions vs Playwright vs APM correlation — Checkly, Postman, Datadog, Webalert (Aug 2026).
Handling 429 Too Many Requests from Rate-Limited APIs
Handle HTTP 429 responses safely with Retry-After, bounded exponential backoff, jitter, shared client budgets, idempotency, and rate-limit monitoring.
mTLS Explained: How Mutual TLS Works and What to Monitor
What mutual TLS (mTLS) is, how two-way certificate authentication differs from regular TLS, and how to monitor client certs so they don't cause outages.
Node.js Uptime Monitoring: APIs, Event Loop, and Process Health
Monitor Node.js APIs with dependency health, event-loop signals, process diagnostics, background work, and release-aware checks.
Circuit Breaker Pattern: States, Tuning, and Monitoring
Implement circuit breakers with closed, open, and half-open states; tune failure windows, probe recovery, fallbacks, and alerts without masking outages.
Exponential Backoff & Jitter: Stop Retry Storms (Code & Math)
Learn how exponential backoff with jitter prevents retry storms. Compare full, equal, and decorrelated jitter formulas, retry budgets, and code examples.
Idempotency Keys in REST APIs: Safe Retries & Webhooks Explained
Learn how idempotency keys prevent duplicate side effects in REST APIs and webhooks. Includes safe retry design, deduplication, concurrency, and code.
GraphQL Monitoring: Errors, Resolvers, Latency, Uptime
Monitor GraphQL operation success, partial errors, resolver latency, complexity and endpoint availability without treating every HTTP 200 as healthy.
API Uptime Monitoring and Health Checks Guide
Build API uptime checks that validate critical endpoints, latency, status, content and authentication, with health endpoints and actionable alerts.