🧩 1. The Typical API Flow (What We Think Works) 5 Explanation: Client → API → Backend → Database Everything looks fine in staging Tests pass ✅ 👉 But this diagram hides the real problem 💣 2. Where Things Actually Break 6 What happened? Backend changed response Frontend still expects old schema 👉 Result: Parsing errors UI crashes Silent failures ⚠️ 3. The Missing Layer: API Contract 6 Key Insight: Your system actually looks like this: Frontend ⇄ API Contract ⇄ Backend But most teams: ❌ Ignore contract validation ❌ Assume compatibility 🔍 4. Breaking Change Example (Visual) 5 Change: // v1 { "status": "SUCCESS", "amount": 100 } // v2 { "amount": 100 } 👉 Removing status breaks: Frontend logic Mobile apps SDKs 🧠 5. Why CI/CD Misses This 5 Current Pipeline: Build → Test → Deploy Problem: Tests validate logic NOT compatibility 👉 No one checks if clients will break ⚡ 6.…