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Plain-language AI glossary

Term 29TechniquesMeaning / context / connections

Techniques / Definition

Structured Output / JSON Mode

A feature that forces AI models to return responses in a specific format like JSON, ensuring parseable and type-safe outputs for programmatic use.

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MeaningThe one-sentence definition.

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ContextHow the idea works in practice.

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01 / Plain-language context

How Structured Output / JSON Mode works.

When building AI features, you usually need structured data, not free-form text. Structured output mode forces the model to return valid JSON matching a schema you define. Instead of hoping the model formats its response correctly, you guarantee it. OpenAI's Responses API supports response_format with a JSON schema. Anthropic's Claude supports tool_choice: "any" to force structured tool call responses.

Without structured output, you end up writing fragile parsing code that breaks when the model adds unexpected formatting, markdown, or explanatory text around the JSON. With it, you get guaranteed valid JSON every time, eliminating an entire class of production bugs.

For production apps, always use structured output when: extracting data from text (names, dates, entities), generating UI content (cards, lists, structured displays), or building multi-step workflows where one model's output feeds into another. Define strict schemas with required fields and enums to constrain the output space.

02 / Practical uses

Where it helps.

  1. 01Data extraction from unstructured text
  2. 02API response generation
  3. 03Form auto-fill from documents
  4. 04Multi-step AI workflows
  5. 05Type-safe AI integrations
03 / Keep exploring
Function Calling (Tool Use)An AI capability where the model can decide to invoke external functions or APIs based on the conversation context.Prompt EngineeringThe practice of crafting effective instructions for AI models to produce desired outputs consistently.Large Language Model (LLM)A neural network trained on massive text datasets that can generate, understand, and reason about human language.AI AgentAn AI system that can autonomously plan, reason, use tools, and take actions to accomplish goals with minimal human intervention.