What is OpenAPI?

OpenAPI is a specification for describing HTTP APIs in a machine-readable document. From one description, tooling can generate client libraries, server stubs, documentation and request validation.

4 tools that work with OpenAPI

Files never leave your browser.

Developer Tools1

JSON Schema GeneratorInfer a JSON Schema from example data, detecting types, string formats and required keys.

Samples & Mock Data2

Sample API Response GeneratorGenerate realistic REST, JSON:API, GraphQL and error-envelope responses with pagination.Sample JSON GeneratorTurn a JSON Schema into realistic sample documents, respecting types, enums, formats and constraints.

AI & LLM Tools1

LLM Tool Schema ConverterMove a function definition between OpenAI, Anthropic, Gemini, MCP and bare JSON Schema — or emit it as a TypeScript type or Zod schema.

Related terms

Terms that appear alongside OpenAPI on the same tools.

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