OpenAPIController Generator

Paste an OpenAPI 3 spec — JSON or YAML — and get Spring Boot controllers, one per tag, with mappings, parameters and return types.

In-browser & private

Controller package

DTO package

Style

Wrap in ResponseEntity

OpenAPI spec (JSON or YAML) Ctrl + Enter to generate

Java

Paste a spec on the left, or press Sample.

Controllers — Endpoints — Size 0 B

What it generates, and why

One controller per tag. A spec's tags are already the author's grouping of the API, so following them produces the file layout a person would have chosen by hand.
Optional query parameters say so. A parameter that is not required is emitted as @RequestParam(required = false) — without it Spring returns 400 whenever the caller leaves it out, which is the opposite of what the spec says.
Path variables are bound by name. {orderId} becomes @PathVariable("orderId") when the Java name differs, so it keeps working after compilation without -parameters.
Interface mode puts the mappings in the interface. That keeps the annotations in step with the spec while your implementation stays yours — regenerate the interface, and the compiler tells you what changed.
Bodies are typed. The request body schema resolves to the same DTO name the DTO generator produces, so the two outputs fit together.