Dynamic OpenAPI/Swagger docs from db.json

[monil80]

Would you accept a PR that adds /docs (Swagger UI) and /openapi.json generated from the JSON database at runtime, with --no-swagger to disable?

If you want, I can retry the commit and gh pr create from here after you confirm.

[tamjid14]

I think this feature could be useful, but it may be better to keep it optional so json-server stays lightweight.

A few points to consider:

/docs

could be useful for quickly exploring a mock API in the browser, especially for beginners or teams using json-server for frontend testing.

/openapi.json

could also help tools like Swagger UI, Postman, or API clients understand the available mock endpoints automatically.

However, I think the feature should probably be opt-in or easy to disable because not every user needs Swagger/OpenAPI support. The proposed --no-swagger flag is useful, but another possible approach could be enabling it only with a flag such as:

json-server db.json --swagger

That would keep the default behavior simple while still allowing users who need API documentation to generate it.