Reveal Every Hidden API Call
API Detective captures and classifies every REST, GraphQL, WebSocket, and JSON request made by any website — right inside a Chrome DevTools side panel.
How It Works
From install to first capture in under a minute.
Install the Extension
Add API Detective to Chrome in one click. No account required. Works immediately after install.
Open the Side Panel
Navigate to any website and open the API Detective side panel from the Chrome toolbar or DevTools.
Capture & Inspect
Watch API calls appear in real time. Click any request to inspect headers, body, and response.
Everything You Need to Reverse Any API
Built for developers, QA engineers, API integrators, and reverse engineers who need to understand what a website is actually doing.
Real-Time Capture
Every network request is intercepted and classified the moment it fires — REST, GraphQL, WebSocket, or JSON.
Auto-Detect Request Type
Automatically distinguishes REST, GraphQL queries & mutations, WebSocket frames, auth endpoints, and raw JSON.
Filter & Search
Filter by type (REST, GraphQL, WS, Auth), search by URL or payload keyword, and deduplicate repeated calls.
Full Request Inspection
Inspect request headers, request body, and formatted response — with JSON syntax highlighting.
Export to Postman
Export captured requests as a Postman collection with one click. Import directly into Postman and start testing.
Export to OpenAPI
Generate an OpenAPI 3.0 spec from captured endpoints automatically. Perfect for documenting third-party APIs.
Session History
Full session replay — go back and inspect API calls from earlier in your browsing session without refreshing.
Privacy First
All capture and analysis happens locally in your browser. Nothing is sent to external servers.
Free vs Pro
Start free. Unlock Pro with a one-time purchase — no subscription.
Free
- Real-time API capture
- REST / GraphQL / WS detection
- Filter by type & search
- Request & response inspection
- cURL export
- Deduplication
- Export to Postman collection
- Export to OpenAPI spec
- Full session history
Pro
- Real-time API capture
- REST / GraphQL / WS detection
- Filter by type & search
- Request & response inspection
- cURL export
- Deduplication
- Export to Postman collectionNEW
- Export to OpenAPI specNEW
- Full session historyNEW
Pay once, use forever. No subscription. Includes all future Pro updates.
Stop guessing. Start capturing.
Install API Detective and see every API call a website makes — in real time.
Add to Chrome — It's Free