OpenAPI Viewer

OpenAPI Viewer is the easiest way to explore, test, and understand OpenAPI 3.0 and 3.1 specifications on your Apple devices.

Whether you're integrating a third-party API, reviewing your team's documentation, or testing endpoints on the go, OpenAPI Viewer gives you a clean, native interface built for developers.

EXPLORE YOUR API

Open any JSON or YAML OpenAPI file and instantly browse all endpoints organized by tag. Search across operations, schemas, parameters, and examples in seconds. View rich documentation for every endpoint — including descriptions, parameters, request bodies, and responses — with schema constraints, validation rules, and example values displayed clearly.

TRY IT OUT

Send real HTTP requests directly from the app. Fill in path, query, header, and cookie parameters, provide a request body, configure authentication, and hit Send. View the response body, status code, duration, and validation results — all without leaving the app.

EXPORT AND SHARE

Copy any request as a cURL command, JavaScript fetch, Swift URLSession, or Python httpx snippet — ready to paste into your terminal or codebase.

BUILT FOR APPLE PLATFORMS

A thoughtfully designed native UI makes even complex, sprawling APIs easy to read. Color-coded methods, clear badge indicators, and structured layouts — built for Apple platforms from the ground up.

FREE TO USE

OpenAPI Viewer is completely free with no subscriptions or paywalls. If you find it useful, you can support development through an optional tip jar — entirely your choice.

KEY FEATURES

• Open JSON and YAML OpenAPI 3.0 and 3.1 specifications • Browse endpoints by tag with HTTP method filters • Full-text search across operations, schemas, examples, and headers • Send real HTTP requests with a built-in inspector • Configure Bearer, API key, Basic, and OAuth credentials • Request history • Copy requests as cURL, fetch, URLSession, or httpx • Schema viewer with constraints, enums, and examples • Native on iPhone, iPad, and Mac