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Structured Output Validator
Validate JSON against a practical subset of JSON Schema: types, required fields, arrays, enums, and additional properties.
- Suggested time
- 10 min
- Output artifact
- An exact contract diagnosis and negative test cases.
- Privacy
- The schema and sample are processed only in your browser.
Local educational tool. Validate every result before production use.
When to use it
JSON validator
Use it when model output must feed code, an API, or a tool without manual repair.
How to use it well
- 1
Enter a real case without secrets or personal data.
- 2
Run, inspect, and challenge the assumptions; the output is not automatic truth.
- 3
Save the artifact in your project and turn it into a reviewable test or decision.
Related foundations
Context and Output Contracts
6 min
04 — Structured outputs: JSON mode, response_format, Pydantic and Instructor
Associated lab: ../labs/05_structured_outputs_instructor.py
Open foundation20 minLab 05 — Native Structured Outputs and Instructor with Pydantic
Localized walkthrough. Run the canonical public lab locally and preserve the result as evidence.
Open foundation