Free · no signup · browser-local
JSONL Conversation Dataset Validator with Line Errors
Check text-conversation or input/output records, duplicate IDs and physical line errors. Export complete normalized JSONL only when the selected checks pass.
Browser-local preparation and checks · no model calls · no input storage
Your output
result.jsonComplete the input to preview and export your result.
These are local preparation and validation tools. A passing check is limited to the stated rules; services are not called, authenticated or executed.
Getting started
Choose the text dataset subset, paste or upload JSONL, then inspect the report before exporting normalized valid data.
Before you use the result
This checks a documented UTools subset, not vendor fine-tuning eligibility. Multimodal messages, tool calls and assistant quality are outside its scope.
Try an example
Load the built-in example, change one value and inspect the actual exported result.
How it works
Bounded browser-local parsing and deterministic rules; no model calls, arbitrary code or remote schema fetches.
Frequently asked questions
Check text conversations or input/output JSONL with physical line numbers and duplicate-ID detection.
How do I use Agent JSONL Dataset Validator?
Choose the text dataset subset, paste or upload JSONL, then inspect the report before exporting normalized valid data.
Does this tool upload my data?
Inputs and files are processed in your browser. Page-view analytics do not contain your tool input.
What should I check before using the result?
This checks a documented UTools subset, not vendor fine-tuning eligibility. Multimodal messages, tool calls and assistant quality are outside its scope.