Structured Output JSON Validator
Validate LLM JSON against a target contract in your browser, then open the live playground with safe preset examples for flat, nested, and failure cases.
Flat contract
Launch summary
Validate a flat response envelope before you reuse it in a status update or release note workflow.
Open preset in playground
Nested object
Ticket triage
Check a nested owner object and ordered next steps before you trust an automation handoff.
Open preset in playground
Failure case
Product extraction
Open an intentionally broken sample to see missing fields, wrong types, and extra keys in one pass.
Open preset in playground