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Phase 12 · Prompt Engineering

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Structured Output (JSON Mode)

Part of the AI Engineer Roadmap.

Summary

Constraining a model's output to a specific schema (usually JSON) so it can be reliably parsed by downstream code — essential for building AI features, not just chat interfaces.

How to Learn This

  • 1Use a model's JSON mode / structured output feature to extract fields from unstructured text.
  • 2Validate the output against a schema (Pydantic/Zod) and handle validation failures.
  • 3Compare reliability of prompt-only JSON requests vs. native structured-output APIs.

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System Prompts

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Prompt Templates

More topics in Prompt Engineering

Prompt Design FundamentalsZero-Shot & Few-Shot PromptingChain-of-Thought PromptingSystem PromptsPrompt TemplatesFunction/Tool CallingPrompt ChainingHandling Hallucinations via PromptingPrompt Injection Risks
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