Problem: APIs work in Postman/Insomnia but break in production when users send real data - emojis in chat messages, oversized files, malformed JSON, edge cases.

Solution: Interactive testing interface simulating user behavior:

Quick Test Playground:

OpenAI, Anthropic, Stability AI, Google AI, Hugging Face

Paste API key → Click test → Results in 10s

text $ curl -H "Authorization: Bearer sk-..." https://api.openai.com/v1/chat/completions → 5 lines of code and headers

ApiRealTest: Select platform → Paste key → Click "Chat" Testing Modes:

Chat: Test conversational APIs (emojis, rapid messages)

Files: Upload images/docs (size limits, security)

JSON: Syntax-highlighted editor with validation

Forms: Key-value pair builder

Analytics: Response times, error rates, payload analysis.

Status: Beta - core features work reliably. UX polish in progress.

Pricing: Free (10 tests/day), $9/mo unlimited, $29/mo teams.

Tech: React + Tailwind + Supabase + Lovable.dev (~10 days to MVP).

Demo: https://api-real-test.lovable.app

Feedback welcome on usability, missing features, pricing.

What real user inputs broke your APIs in production?