OpenAPI DevTools
Browser extension that generates API specs for any app or website
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OpenAPI DevTools is a Chrome extension that generates OpenAPI 3.1 specs in real time from network requests.
- for
- Web developers who need to document APIs of any site or app quickly.
- pricing
- free
Key features
- Real-time spec generation — Creates an OpenAPI 3.1 specification instantly as network requests occur.
- Automatic merging — Merges new request/response headers, bodies and query parameters per endpoint automatically.
- Path-parameter assistance — Click a path parameter to merge existing and future matching requests.
- In-tool view & download — Shows the spec inside the extension and lets you download it with one click.
- Session export & sharing — Export a recording session at any time and share it with others.
Use cases
- Document the API of a third-party web app without manual coding.
- Generate up-to-date OpenAPI specs while debugging network traffic.
- Export a spec to feed into API documentation generators.
- Share a captured API session with teammates for review.
- Merge evolving request details automatically during development.
OpenAPI DevTools FAQ
Does OpenAPI DevTools send any of my data to external servers?+
No. The algorithm runs locally and the extension only accesses network requests while DevTools is open.
How do I install the extension?+
Add it from the Chrome Web Store and it will appear as a new "OpenAPI" tab in Chrome DevTools.
What OpenAPI version does it produce?+
It generates OpenAPI 3.1 specifications.
Can I export the generated specification?+
Yes, you can download the spec with a single click or export the whole session.
Is it possible to share a captured session with others?+
Yes, you can export and share the session file for collaboration.
Summarized by DevHunt from chrome.google.com · Oct 2, 2026. Details may change; check the official site.
