OpenAPI to TypeScript

Generate TypeScript types from OpenAPI 3.0 / 3.1 YAML or JSON documents locally in your browser with common codegen options.

OpenAPI to TypeScript

Generate TypeScript types online from OpenAPI 3.0 / 3.1 YAML or JSON documents with common codegen options, copy support, and `.d.ts` downloads.

How to use

  1. Paste an OpenAPI YAML or JSON document and the tool will parse it locally in the browser.
  2. Toggle options such as `export type`, `enum`, `rootTypes`, and `path params` to shape the output.
  3. Review the generated TypeScript and check for external `$ref` usage or document structure issues.
  4. Copy the result or download it as a `.d.ts` file for API integration, SDK drafts, and type reviews.

Features

  • Converts OpenAPI 3.0 / 3.1 YAML / JSON into local TypeScript types
  • Supports common `openapi-typescript` codegen options and header comment control
  • Includes sample loading, file import, external `$ref` detection, copy, and `.d.ts` download

Why use this?

  • Useful for contract checks, frontend-backend integration, SDK prototypes, mock schemas, and editor autocomplete setup
  • Faster and safer than manually rewriting response and request shapes from API docs
  • Runs fully in the browser so your API schema never needs to leave the local machine

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