Structured output: JSON mode & schemas

When downstream code consumes model output, free text is fragile. Use JSON mode, schemas, or XML tags for parseable results.

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Step 1 of 2

JSON extraction prompt

Define the exact schema. Ask for JSON only. Validate with a parser.

Example

{
  "test_cases": [
    {
      "id": "TC-001",
      "title": "Login with valid credentials",
      "steps": ["Navigate to /login", "Enter valid user/pass", "Click Submit"],
      "expected": "Dashboard loads"
    }
  ]
}

Do this now

Extract test cases from a paragraph into JSON array. Parse with JSON.parse().

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Chapter learning outcomes

JSON mode
Schema validation
XML tags

Clear these before you leave

JSON prompt works 4/5 times
Parser handles fences

Side quest

Bug report extractor

Prompt that turns Slack messages into structured bug reports.