What Is OpenAPI Schema Generation?
OpenAPI 3.0 is the industry standard for documenting RESTful APIs. Writing schema components by hand is time-consuming and error-prone. This tool analyzes your JSON data sample and auto-generates the corresponding OpenAPI 3.0 schema component with proper types, required fields, and nested object definitions.
How to Generate an OpenAPI Schema from JSON
- Paste a JSON sample of your API response. Include representative values for each field.
- Click Generate OpenAPI to create a complete OpenAPI 3.0 schema component under
components/schemas/GeneratedModel. - Copy the schema into your OpenAPI specification file and customize the endpoint paths and metadata as needed.
Frequently Asked Questions
Does it generate the full OpenAPI spec?
The tool generates the schema component only. You will need to add paths, info, and other top-level fields to complete your API specification.
How are required fields determined?
All fields present in your JSON sample are marked as required. Remove fields from the input if they should be optional.
Can I extract JSON from an existing OpenAPI schema?
Yes, use the Swap button to generate sample JSON data from an OpenAPI schema definition.