OpenAPI Validator
Validate OpenAPI specifications for errors
OpenAPI Validator is a free online tool from BrowserUtils that validate openapi specifications for errors. It runs entirely in your browser — your data never leaves your device. No account required.
OpenAPI Spec (JSON / YAML)
Validation Results
Paste an OpenAPI spec to validate...
How to use OpenAPI Validator
- 1 Paste or type your input into the editor above.
- 2 The tool processes your data instantly — right in your browser, with nothing sent to a server.
- 3 Copy the result with one click or continue editing your input.
About OpenAPI Validator
Free online OpenAPI validator. Paste an OpenAPI 3.x specification in JSON or YAML and check for structural errors, missing fields, and common issues. This tool runs entirely in your browser — your data is never sent to a server. Just paste your input, get instant results, and copy with one click. No sign-up or installation required.
OpenAPI Validator specs
- Runtime
- 100% client-side (browser)
- Cost
- Free — no account, no rate limits, no usage caps
- Browser support
- Chrome 90+, Firefox 88+, Safari 14+, Edge 90+
- Part of
- 299 developer tools on BrowserUtils (100% client-side)
Questions
What OpenAPI versions are supported?
The validator supports OpenAPI 3.x specifications. It checks for required fields (openapi, info, paths), validates path structures, and reports missing descriptions and response codes.
Does it accept YAML format?
Yes, paste your spec in either JSON or YAML format. The validator auto-detects the format and parses accordingly.
Is the OpenAPI validator safe for internal API specs?
Yes, all validation runs in your browser. No specification data is sent to any server, so proprietary API definitions stay private.
What specific checks does the OpenAPI validator perform?
The validator checks for required top-level fields (openapi, info, paths), valid path structures, response codes, missing descriptions, and proper schema references. It reports each issue with its location in the spec.
Does the OpenAPI validator work offline?
Once the page is loaded, all validation logic runs in the browser with no network requests. You can validate specs without an internet connection.
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