JSON to OpenAPI/Swagger Converter - Generate API Specifications
Convert JSON examples to OpenAPI 3.0 specifications instantly. Generate Swagger documentation from JSON data.
How to Convert JSON to OpenAPI/Swagger - Step by Step Guide
Input Your JSON Example
Paste a JSON example that represents your API response or request body. The tool will analyze the structure and generate appropriate OpenAPI schemas.
Configure API Details
Set your API title, version, and choose output format (YAML or JSON). The generator creates standard OpenAPI 3.0 compliant specifications with GET and POST endpoints.
Download OpenAPI Specification
Get your complete OpenAPI specification ready to use with Swagger UI, API documentation tools, and code generators.
What is JSON to OpenAPI Conversion?
JSON to OpenAPI conversion analyzes JSON data structures and generates OpenAPI 3.0 (formerly Swagger) specifications. OpenAPI is the industry standard for describing RESTful APIs, enabling automatic documentation generation, client SDK creation, and API testing tools.
This tool infers data types, required fields, and nested object structures from your JSON examples, creating complete API schemas that work with Swagger UI, Postman, and other API development tools.
Frequently Asked Questions
What is OpenAPI and why should I use it?
OpenAPI (formerly Swagger) is the industry-standard specification for describing RESTful APIs. It enables automatic documentation generation, client SDK creation, API testing, and integration with tools like Swagger UI, Postman, and API gateways.
Can I use the generated spec with Swagger UI?
Yes! The generated OpenAPI 3.0 specification is fully compatible with Swagger UI, Redoc, and other OpenAPI documentation tools. Simply import the YAML or JSON file into your documentation platform.
How accurate is the type inference?
The tool accurately infers types including strings, numbers, integers, booleans, arrays, and nested objects. It also identifies required fields based on the presence of values in your JSON example.
Should I use YAML or JSON format?
YAML is more readable and commonly used for OpenAPI specifications, while JSON is easier to process programmatically. Both formats are functionally equivalent - choose based on your preference and tooling requirements.
Can I customize the generated specification?
Yes! After generation, you can edit the specification to add descriptions, examples, authentication requirements, additional endpoints, and other OpenAPI features. The generated spec provides a solid foundation to build upon.
Is the JSON to OpenAPI converter free?
Yes, completely free with no limitations. No registration required.