Enable JSON mode
How to use JSON mode with W&B Inference.
less than a minute
Enabling JSON mode instructs the model to return the response in a valid JSON format. However, the reponse’s schema may not be consistent or adhere to a particular structure. For consistent structured JSON responses, we recommend using structured output when possible.
To enable JSON mode, specify it as the “response_format” in the request:
import json import openai client = openai.OpenAI( base_url='https://api.inference.wandb.ai/v1', api_key="<your-api-key>", # Available from https://wandb.ai/authorize ) response = client.chat.completions.create( model="openai/gpt-oss-20b", messages=[ {"role": "system", "content": "You are a helpful assistant that outputs JSON."}, {"role": "user", "content": "Give me a list of three fruits with their colors."}, ], response_format={"type": "json_object"} # This enables JSON mode ) content = response.choices[0].message.content parsed = json.loads(content) print(parsed) curl https://api.inference.wandb.ai/v1/chat/completions \ -H "Content-Type: application/json" \ -H "Authorization: Bearer <your-api-key>" \ -d '{ "model": "openai/gpt-oss-20b", "messages": [ {"role": "system", "content": "You are a helpful assistant that outputs JSON."}, {"role": "user", "content": "Give me a list of three fruits with their colors."}, ], "response_format": {"type": "json_object"} }' Feedback
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