STRUCTURED MODEL OUTPUT
LLM Output Validator
Check one JSON output or a JSON Lines batch against a JSON Schema Draft-07 contract. Inspect validation errors by case and field path. This tool makes no model calls and does not judge whether the content is factually or ethically correct.
SCHEMA + OUTPUTS
Validate saved JSON responses
Schema limit: 512 KB. Output limit: 1 MB and 500 JSONL records. External $ref URLs are not fetched. Uploads stay in this browser.
A JSON array document is one output; JSON Lines treats each non-empty line as a separate output.Inputs are parsed locally.
VALIDATION RESULTS
Schema check
Case results
Paths use JSON Pointer notation.
What this validator checks
It validates JSON syntax and schema constraints using a local Draft-07 validator. Supported constraints include types, required properties, property and item schemas, enums, constants, string and array length limits, numeric bounds, formats supported by the bundled validator, and locally defined references. User-supplied regular-expression patterns are explicitly rejected to keep validation time bounded.
What schema validity does not establish
A structurally valid response can still contain a false, unsafe, biased or irrelevant answer. This tool does not call models, grade semantics, evaluate truthfulness, inspect refusals, or protect secrets already present in the input file.
- Only JSON Schema Draft-07 is supported in this release.
- Remote references are never fetched; use local definitions in the supplied schema.
- Format validation is limited to the formats provided by the bundled validator. The JSON Schema pattern keyword is not supported.
- Batch JSONL expects one compact JSON value per non-empty line.