Can this output YAML?

Yes. Switch output format to YAML in the controls.

Does it detect parse error location?

Yes. Parse failures include line and column hints when the parser provides a position.

Is data uploaded anywhere?

No. Conversion runs locally in your browser.

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📘 JSON to OpenAPI Schema Generator

Generate a simple OpenAPI schema from JSON samples. Useful for documenting API responses quickly. No sign-up required. Keeps your data private on-device.

JSON to OpenAPI

Convert JSON samples into OpenAPI components with version/output toggles, format inference, reusable component extraction, and parse diagnostics.

Schema nameOpenAPI versionOutput formatInfer string formats (email, uuid, uri, date-time)Infer array enums for small primitive setsExtract nested object schemas into reusable components

JSON input

OpenAPI output

How to use this tool

Paste representative JSON payloads.
Set OpenAPI version and output format, then generate.
Review validation status and copy/download schema output.

Inference coverage

Maps integers vs numbers for numeric precision in schema types.
Detects common string formats like email, UUID, and date-time.
Optionally extracts nested objects into reusable component refs.

Limitations

Inference is sample-based; uncommon edge cases may need manual edits.
Array enum inference is intentionally conservative.
Always validate final specs in your CI pipeline.

FAQ

Can this output YAML?: Yes. Switch output format to YAML in the controls.
Does it detect parse error location?: Yes. Parse failures include line and column hints when the parser provides a position.
Is data uploaded anywhere?: No. Conversion runs locally in your browser.