Offline engine (processed locally)JSON v1.0.0 Spec

JSON Schema to OpenAPI

v1.0.0

Effortlessly convert your JSON Schema into OpenAPI 3.0 or 3.1 schemas. This free online converter maps JSON Schema types, validations, and examples directly to OpenAPI components, saving you hours of manual mapping. Perfect for building Swagger/OpenAPI docs from existing JSON Schema. No sign-up, fully client-side.

Live sync—ms

JSONInput (JSON)Invalid

lines: 1chars: 28Size: 28 BUTF-8

JSONOutput (JSON)

Auto-generated

Converted output will appear here

lines: 0chars: 0Size: 0 BUTF-8

Size change: -100.00%TOML compliant: v1.0.0

Tool guide

Accurate conversion

Input is processed by this tool’s dedicated converter.

Local processing

Your input is processed in your browser and is not uploaded.

Ready-to-use output

Copy the result or save it as a file.