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Glossary · Beginner · 2023

JSON Mode

An API setting that guarantees the model's output is valid JSON.

EN — English term
JSON Mode
TR — Turkish term
JSON Modu

JSON Mode, introduced by OpenAI in November 2023, is an API setting that guarantees the model's output is always a valid JSON document. What used to be a polite request in the prompt is now enforced at the model level, eliminating parse errors in end-to-end applications. Anthropic, Google, and other providers added similar capabilities to their own APIs. JSON Mode only guarantees format, not schema — for full schema conformance you reach for the next step up, Structured Output.