JSON & Schema Validator
Validate model output, find the exact error, and fix common problems.
Schema checks cover type, required, properties, items, enum, minimum, maximum and minLength. It is a quick check, not a full JSON Schema validator.
What It Is For
When a model is asked for structured output, the result sometimes arrives wrapped in a code block, with an extra sentence around it, or with a trailing comma. This tool finds the exact line and column of a syntax error, checks the structure against a schema, and fixes the most common problems.
Questions
Is my data uploaded?
No. Validation happens in your browser.
What does Fix common issues do?
It removes Markdown code fences, trims text before and after the JSON, and removes trailing commas. It does not guess at anything else, so check the result before using it.
Is this a full JSON Schema validator?
No. It covers the most common checks (type, required fields, nested properties, array items, allowed values, simple number and string limits) and is meant for quick checks.