API Playground
APIWitness

API Playground

Paste an OpenAPI spec or Postman collection to generate interactive docs, mock APIs, a testing interface, and SDK snippets.

Drop your OpenAPI file here, or

Supports OpenAPI (JSON/YAML) and Postman collections (JSON)

Paste or upload an OpenAPI spec to get started

Generate interactive docs, mock APIs, a live testing interface, and SDK code snippets — all from a single spec.

Interactive Docs

Browse endpoints with schemas

Mock APIs

Generate mock responses

Testing Interface

Send live requests

SDK Snippets

Generate client code