Its autocomplete story is a mess, but https://github.com/Kong/insomnia#readme at least allows one to visualize any schema authored in the document (it generates examples as well as a schema browser). It's possible that other OpenAPI tools behave similarly, I just happen to have the most hand's on with Insomnia

for example:

    openapi: 3.0.0
    info:
      title: this is my title
      description: a long description goes here
      version: v1
    servers:
    - url: http://127.0.0.1:9090
      description: the local server
    paths:
      /thingy:
        get:
          responses:
            "200":
              description: ok
              content:
                application/json:
                  schema:
                    $ref: '#/components/schemas/Thingy'
    components:
      schemas:
        Thingy:
          type: object
          properties:
            alpha:
              type: boolean

as for the "create automatically," I'd guess that's a genuinely hard problem although if your example documents are simple/homogeneous enough you may get away with it

ok:

  [{"alpha": true}, {"alpha":false}]

problematic:

  [
   {"alpha":{"beta": ["charlie", 3.1415, null]}},
   {"alpha":[{"beta":null}]},
   {"alpha": null}
  }

I like to use zod for Typescript and Pydantic for python.

https://github.com/StefanTerdell/zod-to-json-schema

https://docs.pydantic.dev/latest/usage/json_schema/

You can find a suitable tool on the official website https://json-schema.org/implementations.html#schema-generato...