Get a Normal JSON Response Without Using a Schema or Structured Mode

[mssayari]

Hi everyone,

Thanks for this great library. I’m trying to get a normal JSON response (not a structured schema-based response, just raw JSON like { title, description, tags, ... }).

I noticed there’s a method called usingStructuredMode() that accepts one of the StructuredMode enums (Auto, Json, Structured). However, this is only available when using structured mode, and to use that, I need to provide a schema—which I don’t want to do.

I simply want to receive a plain JSON response from the OpenAI model (e.g., by formatting the prompt properly and instructing the model to return JSON), but I’m unsure how to do that through this library.

My questions are:
1. If I’m not using structured mode, and just using text() mode, how can I set the response_format to return JSON?
2. Is there a way to use the structured mode without providing a schema?
3. Is there an example or recommendation for generating JSON responses without going full structured/schema mode?

I’ve checked the docs, but haven’t found any example for normal Json response, it's either text or structured!