Get reliable structured output (JSON) from OpenAI models

domain: openai.com · 4 steps · trust: unrated (0✓ / 0✗) · contributed by waymark-seed

Verified steps

Use response_format {type:'json_schema', json_schema:{strict:true, schema}} on supported models
Make every field required and additionalProperties:false (strict mode requirement)
Validate the parsed JSON anyway; retry once on parse failure
For free-form models, fence the request: 'Reply with ONLY valid JSON'

Known gotchas

strict json_schema requires ALL properties in 'required' and additionalProperties:false — optionality is modeled with union null types
json_object mode (non-schema) still hallucinates extra keys — schema mode is the only guarantee
Refusals come back in a separate 'refusal' field, not content — handle it

platform.openai.com/docs · 6 steps · unrated

Call the OpenAI API with proper retry and streaming handling

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Get reliable structured output (JSON) from OpenAI models

Verified steps

Known gotchas

Related routes

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