Open an OpenAPI or Swagger file
Open a JSON or YAML spec, load one from a URL, or paste it into the source editor. Everything is processed locally.
Open an OpenAPI 3.x or Swagger 2.0 file in JSON or YAML and instantly explore endpoints, parameters, schemas, and responses in a clean, interactive UI — 100% private, right in your browser.
Open a JSON or YAML spec, load one from a URL, or paste it into the source editor. Everything is processed locally.
The OpenAPI Viewer turns any OpenAPI 3.x or Swagger 2.0 definition into clean, browsable API documentation. Open a JSON or YAML file and instantly navigate endpoints, parameters, request bodies, responses, and data models — then test calls live, all without sending your spec to a server.
A purpose-built lightweight renderer parses and displays even large specifications in milliseconds — no heavy framework, no endless scrolling, no spinners.
Your API definition never leaves your device. Parsing, rendering, and even live requests run entirely in your browser — perfect for internal and unreleased APIs.
Full support for Swagger 2.0, OpenAPI 3.0 and 3.1 in both JSON and YAML, including $ref resolution, allOf/oneOf/anyOf, enums, and nested models.
Send real requests straight from the browser, generate ready-to-run cURL commands, and inspect live responses — documentation and testing in one place.
Click “Open File” to load an OpenAPI or Swagger document from your computer, paste it into the source editor, or pull it straight from a URL.
Endpoints are grouped by tag in the sidebar with color-coded methods. Filter instantly and click any operation to see parameters, schemas, and responses.
Expand data models, copy a cURL command, or use “Try it out” to send a live request and view the real response — all inside your browser.
Sanity-check the OpenAPI output of your framework, verify $ref models resolve correctly, and review responses before publishing your documentation.
Quickly understand a third-party or internal API, find the right endpoints and payload shapes, and test calls without leaving the browser.
Audit endpoints, parameters, and schemas of confidential specs locally, with zero risk of leaking an unreleased API to an online service.
Built to fix the biggest frustrations developers have with traditional tools.
Everything you need to know about the OpenAPI & Swagger Viewer.
No. This OpenAPI viewer is 100% client-side. Your JSON or YAML file is read, parsed, and rendered entirely in your browser using local resources. Nothing is ever uploaded, stored, or logged, which makes it safe for confidential, internal, and unpublished API specifications.
The viewer supports Swagger 2.0 as well as OpenAPI 3.0 and 3.1, in both JSON and YAML formats. It resolves internal $ref references and renders composed schemas (allOf, oneOf, anyOf), enums, arrays, and deeply nested models.
Yes. Each endpoint includes a 'Try it out' panel that sends a real request from your browser and shows the live status, timing, and response body. You can also copy a ready-to-run cURL command. Live requests are subject to the target API's CORS policy.
No installation and no sign-up. The viewer runs in any modern browser. Just open your OpenAPI or Swagger file — or load one from a URL — and start exploring immediately.
Yes. Unlike some heavier tools that slow down on large documents, this viewer uses an efficient custom renderer and lazy-expands schemas, so it stays fast even for specs with hundreds of endpoints and models.
No registration, no tracking of your content, no server uploads. Don't just take our word for it:
Your files and text are processed entirely on your device. Nothing is ever sent to us.
Once loaded, this tool keeps working with your Wi-Fi turned off. Try it.
Open your browser's DevTools → Network tab. You'll see zero requests carrying your data.
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