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Zudoku

MIT-licensed API documentation framework by Zuplo

open sourceupdated Apr 21, 2026

Zudoku is an MIT-licensed API documentation framework built by the team behind Zuplo API gateway. It generates developer portals from OpenAPI specs with features like interactive API playground, markdown content pages, authentication integration, and search. Designed as a free alternative to ReadMe and Stoplight with customizable themes and plugin architecture.

Zudoku fills the gap between basic Swagger UI rendering and expensive documentation platforms like ReadMe and Stoplight by providing a full-featured API developer portal framework under the MIT license. The framework generates complete documentation sites from OpenAPI specifications with interactive try-it-out functionality, markdown-based content pages for guides and tutorials, built-in search, and customizable navigation that organizes APIs logically rather than just listing endpoints alphabetically.

The developer portal includes authentication integration that lets API consumers obtain and manage their API keys directly from the documentation, bridging the gap between reading about an API and actually using it. Code examples are generated automatically in multiple languages with the user's API key pre-filled, reducing the friction from reading documentation to making the first successful API call.

Built by the Zuplo team, Zudoku benefits from deep understanding of API developer experience gained through building an API gateway product. The plugin architecture enables custom extensions for analytics, feedback collection, and integration with existing developer tools. Theming support ensures documentation matches the product's visual identity rather than looking like generic auto-generated reference pages. The MIT license and framework approach mean teams own their documentation infrastructure completely without vendor dependency.

Pricing

Free and open-source under MIT license

Platforms

Node.js, React, static site generation

Categories

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FAQ

What is Zudoku?

Zudoku is an MIT-licensed API documentation framework built by the team behind Zuplo API gateway. It generates developer portals from OpenAPI specs with features like interactive API playground, markdown content pages, authentication integration, and search. Designed as a free alternative to ReadMe and Stoplight with customizable themes and plugin architecture.

Is Zudoku free?

Yes — Zudoku is open source and free to use. Free and open-source under MIT license

Is Zudoku open source?

Yes — Zudoku is open source.

What are the best Zudoku alternatives?

The top editor-verified Zudoku alternatives are Scalar, OpenDataLoader PDF.