API Debugger Overlay

About

API Debugger Overlay puts real-time API debugging directly on any webpage.

Monitor fetch and XHR requests without switching to DevTools. Inspect responses, detect slow endpoints, identify duplicate calls, visualize API dependencies, replay requests, and get AI-powered diagnostics that explain performance issues and optimization opportunities.

KEY FEATURES

• Real-time API request monitoring
• AI-powered debugging and performance analysis
• Duplicate request detection
• Slow API and large payload warnings
• Interactive JSON response viewer
• API dependency mapping
• Request replay with response comparison
• Session export and reporting
• DevTools-level timing with Precise Mode

AI-POWERED INSIGHTS

Click Ask AI on any request to get:
• Root cause analysis for slow APIs
• Large payload recommendations
• Duplicate request explanations
• Performance optimization suggestions
• Actionable debugging guidance

PRIVACY FIRST

All request data stays on your machine.

No tracking.
No accounts.
No external servers.

Your OpenAI API key is stored locally and encrypted. Request and response bodies are never sent to AI services.

PERFECT FOR

• Frontend Engineers
• Full-Stack Developers
• QA Engineers
• Engineering Teams

Install, open any website, and start debugging instantly.