Does this tool support Swagger 2.0 and OpenAPI 3?

Yes. As long as your document is valid Swagger 2.0 or OpenAPI 3 JSON with a paths object, the generator will create client code for each endpoint.

Is my OpenAPI file uploaded to a server?

No. All parsing and code generation happens locally in your browser using JavaScript. Your API definitions never leave the page.

OpenAPI / Swagger → Code Client Generator

Q: How do I generate client code from an OpenAPI spec?

Paste your OpenAPI or Swagger JSON into the input, choose a target language such as JavaScript, TypeScript, Python, Java, C#, Go, PHP, Kotlin, Swift, Rust, Dart or Node.js, and click Generate Client. The tool inspects the paths and methods and generates one function per operation.

Runs in your browser with no sign-up required.
Fast, lightweight, and mobile friendly.

Paste or type your input below, then use the buttons to process it.

Paste your OpenAPI or Swagger JSON and generate an API client in JavaScript, TypeScript, Python, Java, C#, Go, PHP, Kotlin, Swift, Rust, Dart or Node.js. All generation happens locally in your browser.

OpenAPI / Swagger Spec

This tool expects a valid JSON OpenAPI (v3) or Swagger (v2) document. YAML is not yet supported. You can convert YAML to JSON using your JSON tools and paste the result here.

Target language: Client name / class / module: Base URL override:

Generated Client Code

One function/method is created per operation based on HTTP method and path. Path params, query params and body are surfaced as arguments to help you integrate quickly.

API A OpenAPI / Swagger → Code Client Generator

OpenAPI / Swagger Spec

Generated Client Code

OpenAPI / Swagger → Code Client Generator