OpenAPI Helpers
Turn a JSON document into an OpenAPI schema, build an example from a schema, or check an example against one.
JSON document
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Example document
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Output
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The result appears here.
Runs entirely in your browser. Nothing you paste is uploaded, and you can confirm that in your browser Network tab.
About this tool
Three things people do with an OpenAPI schema, on one page. "JSON to schema" infers a schema the same way the JSON Schema Generator does, then writes it in whichever OpenAPI dialect you pick: 3.1, where a schema object is JSON Schema itself, or 3.0, which has no type array and spells a nullable field as a single type plus nullable: true instead. "Schema to example" builds one JSON value that satisfies a schema, preferring an example or default the schema already states over inventing one. "Validate example" checks a document against a schema and lists every keyword it failed, resolving OpenAPI 3.0's nullable keyword first so a 3.0 schema is checked correctly rather than against JSON Schema's own type array rules. All three understand local $ref, allOf, anyOf and oneOf.
How to use
- Pick what you want: JSON to schema, schema to example, or validate an example.
- Paste the input the mode asks for, or load the sample.
- Press the button. Switch the OpenAPI version any time to see the same input written the other dialect's way.