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JSON Mode

API flag that guarantees valid JSON output.

2 hours1 resources1 prereqs

OpenAI: response_format: { type: "json_object" }. Gemini: response_mime_type: "application/json". Anthropic has no native flag but prefill + strict prompt suffice.

Important: JSON mode guarantees "valid JSON", not correct schema. For schema see next node.

Prerequisites

Output Formatting

Markdown, tables, code blocks, bullets — design the output for the consumer (human or parser).

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Function / Tool Calling

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