I want to create OpenAPI spect in JSON or RAML, can that be done with ApiDog
You can import OpenAPI spec JSON files into Apidog. Please refer to this guide: Import OpenAPI Spec - Apidog Docs
Sorry I do not want to import, I want to create. May be I need another tool ?
In Apidog, you can design API documentation that complies with OAS specifications. After creating your API documentation, you can export it in OpenAPI format. Could you provide an example of the JSON content you’re referring to?