#1 pain point on r/webdev in 2026: debugging async API sequences

Debug API Integrations
Step by Step — Before Production Breaks

Simulate request → queue → webhook → retry → race conditions. See state changes, timing gaps, and duplicate fires — all in your browser. No backend required.

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The 6 Integration Bugs FlowTrace Catches

⏳

Late Webhooks

Webhook arrives after timeout. Your handler already marked the order as failed.

🔁

Double Retry Fires

Retry logic fires twice on the same event. Customer gets double-charged.

🏁

Race Conditions

Webhook and polling both update state. Last write wins — data corruption.

👻

Silent State Drift

Docs say "pending" but API returns "processing". Your UI shows wrong status.

📦

Out-of-Order Events

completed arrives before created. Idempotency table has no row yet.

🧩

Missing Handlers

New event type added by provider. Your switch statement silently ignores it.

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