Why it matters

Structured JSON is standard integration pattern. Provider-native is more reliable than prompt-only.

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The architecture

Schema: JSON Schema.

Provider constraint: response_format or tool.

Parse: Jackson.

Structured JSON outputSchemaJSON SchemaProvider constraintresponse_formatParse + validateJackson + schemaProvider-native constraint far more reliable than prompt-only JSON
JSON output flow.
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How it works end to end

OpenAI structured outputs.

Anthropic tool use.

Gemini responseSchema.

Parse + validate.