Professional REST & HTTP client in your browser — Free & Open Source
API Testing PRO is a full-featured REST & HTTP client built directly into Chrome. Test APIs, debug endpoints, and manage requests without leaving your browser. Perfect for developers, QA engineers, and anyone working with web APIs.
Built with Chrome Extension Manifest V3. Part of the Zovo suite of privacy-first browser tools.
- Send REST API requests with support for GET, POST, PUT, DELETE, and PATCH methods
- Side panel interface — test APIs without leaving your current page
- Request history — automatically saves your recent requests
- Collections — organize and save frequently used requests
- Headers, query params, and body editor — full control over every request detail
- Response viewer with syntax highlighting for JSON, XML, and more
- Multiple body types — JSON, form data, raw text, and URL-encoded
- Visit the Chrome Web Store and search for "API Testing PRO by Zovo"
- Click Add to Chrome
- Pin the extension to your toolbar for quick access
We believe in transparency. Here's why we need each permission:
| Permission | Purpose |
|---|---|
storage |
Save your request history, collections, and settings locally |
sidePanel |
Display the API testing interface in Chrome's side panel |
activeTab |
Capture the current page URL for context-aware testing |
We request only the minimum permissions needed. No broad host permissions, no background data access.
Your privacy is our top priority:
- Zero data collection — Nothing leaves your browser
- No analytics or tracking — We don't monitor your usage
- No third-party services — Everything runs locally
- No account required — Use it right away, no sign-up
- Open source — Inspect every line of code
Read our full Privacy Policy.
- Platform: Chrome Extension (Manifest V3)
- Languages: JavaScript, HTML, CSS
- Storage: Chrome Storage API (local only)
- External Dependencies: None
We welcome contributions! Here's how you can help:
- Report bugs — Open an issue describing the problem
- Suggest features — We'd love to hear your ideas
- Submit PRs — Fork, branch, and submit a pull request
- Spread the word — Star this repo and share with others
Zovo builds privacy-first browser extensions that respect your data and your time.
Our principles:
- Privacy by default — no data collection, ever
- Minimal permissions — only what's needed
- Transparent — open source community editions
- Quality over quantity — each tool does one thing well
MIT License — see LICENSE for details.
Made with care by Zovo