OpenAPI to JSON Extractor

Extract sample JSON data from OpenAPI 3.0 schema definitions. Generate example payloads from your API specs.

Sample JSON will appear here...

What Is OpenAPI to JSON Extraction?

OpenAPI specifications define the structure of your API responses using schema objects. This tool parses the first schema component from your OpenAPI 3.0 spec and generates a sample JSON payload with appropriate default values for each property type. This is useful for generating test data, populating mock servers, and validating your API design.

How to Extract JSON from OpenAPI

  1. Paste your OpenAPI JSON containing components/schemas definitions.
  2. Click Extract JSON to parse the first schema and generate a sample payload with typed default values.
  3. Copy the output for use in testing, documentation, or as a starting point for your frontend mocks.

Frequently Asked Questions

Which schema does the tool extract from?

The tool extracts from the first schema found in components/schemas. If you have multiple schemas, reorder them or use them individually.

What default values are used?

Strings become "string", integers become 0, numbers become 0.0, booleans become true, and arrays contain a single sample item.

Can I convert JSON back to OpenAPI?

Yes, use the Swap button to generate an OpenAPI schema component from a JSON sample.

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