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Transform your JSON data into a complete OpenAPI 3.0 specification with our free online converter. Automatically generate API schemas, paths, and documentation from JSON examples. Perfect for API developers, documentation teams, and anyone working with REST APIs. Features include automatic schema inference, customizable API details, YAML/JSON export, and 100% client-side processing for complete data privacy.
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Paste or type your JSON structure into the editor. The tool accepts:
The OpenAPI specification generates automatically as you type.
Enhance your OpenAPI spec:
Edit the generated YAML to match your API requirements.
Download or copy your specification:
Integrate with your API development workflow.
Instant conversion
Proper data types
Object handling
Item definitions
Client-side only
Customize output
YAML/JSON formats
Mobile friendly
OpenAPI (formerly known as Swagger) is the industry standard for REST API documentation. Converting JSON to OpenAPI transforms your data structures into a machine-readable specification that can be used for documentation, testing, and SDK generation. Our tool automatically detects data types, handles nested objects, defines array structures, and creates proper schema definitions that follow OpenAPI 3.0 standards.
Beyond basic conversion, our JSON to OpenAPI tool generates production-ready specifications with proper schema organization, reusable components, and extensible structure. The output includes complete info sections, path definitions, component schemas, and example values. You can further customize the specification to add security schemes, parameter definitions, and detailed descriptions for a comprehensive API documentation solution.
Choose from our suite of JSON tools to start processing your data right away.
Generate JSON Schema validation rules from JSON objects.
Test REST APIs with custom headers and request bodies.
Validate JSON syntax with AI-powered error detection and automatic fixing.
Edit JSON with tree view, real-time validation, and statistics.
Visualize JSON data as interactive graphs and tree structures.
Beautify and format JSON with syntax highlighting and customizable indentation.
JSON to OpenAPI conversion transforms JSON data structures into OpenAPI (Swagger) specification format. This tool automatically generates a complete OpenAPI 3.0 specification from your JSON examples, including paths, schemas, parameters, and response definitions. Perfect for API documentation, client SDK generation, and contract-first development.
Simply paste your JSON data into the input editor. Our tool will automatically analyze the structure and generate a complete OpenAPI specification with proper data types, nested objects, and array definitions. You can then customize the generated specification with your API details like title, version, description, and endpoint paths.
Our JSON to OpenAPI converter supports all major OpenAPI 3.0 features including: schema definitions with proper data types (string, number, boolean, object, array), nested object handling, array definitions with item types, required field detection, example values, path parameters, query parameters, request/response bodies, and complete specification structure with info, paths, and components sections.
Yes! After generating the initial OpenAPI spec from your JSON, you can edit the YAML output directly in the editor. Add descriptions, modify data types, adjust validation rules, define API endpoints, and customize any aspect of the specification. The tool provides a solid foundation that you can build upon for your specific API requirements.
Absolutely! All JSON to OpenAPI conversion happens entirely in your browser. Your data never leaves your device and is not transmitted to any server. We prioritize your privacy and security, ensuring that sensitive JSON data or API specifications remain completely private.
The generated OpenAPI specification can be used for: API documentation generation with tools like Swagger UI or Redoc, client SDK generation for multiple languages, server stub generation, API testing with tools like Postman, contract validation, integration with API gateways, and compliance with API standards. It's the industry standard for REST API documentation.
Enter JSON data and click "Generate OpenAPI Spec" to create your API specification