Prompting
JSON Mode
An API setting that guarantees a model's output is valid, parseable JSON, without guaranteeing that it matches any particular schema.
In depth
An API setting that guarantees a model's output is valid, parseable JSON, without guaranteeing that it matches any particular schema. In OpenAI's API you enable it with response_format type json_object in Chat Completions or text.format in the Responses API. You must also tell the model to produce JSON in the prompt, and the API errors if the word JSON does not appear in context. OpenAI describes it as a more basic version of Structured Outputs, which is the better choice when you need specific fields and types.
Primary source: developers.openai.com
Example
In practice, developers reach for JSON Mode when they need the capability described above as part of an AI feature or workflow.
Go deeper at Developers Digest
Hands-on guides, comparisons, and tutorials that cover Prompting.
FAQ
Common questions
What is JSON Mode?
An API setting that guarantees a model's output is valid, parseable JSON, without guaranteeing that it matches any particular schema.
Why does JSON Mode matter for AI developers?
JSON Mode sits in the Prompting part of the AI stack. Understanding it helps you make better decisions when building, debugging, and shipping AI features.
Where can I learn more about JSON Mode?
Developers Digest publishes tutorials and videos that cover Prompting topics including JSON Mode. Check the blog and YouTube channel for hands-on walkthroughs.
Related
Related terms
Prompting
Jailbreak
A jailbreak is a prompt written to get a model to produce output its safety training is meant to refuse.
Prompting
Few-Shot Learning
A prompting technique where you include a small number of input-output examples in the prompt to show the model the pattern you want it to follow.
Prompting
Reward Model
A model trained to give a response a single score that predicts how much a human would prefer it.
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