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AiTechWorlds
AiTechWorlds
Validate JSONL fine-tune datasets line by line, including the chat messages format and training target.
100% in-browser. Chat mode checks the standard fine-tune shape — a messages array of role/content objects with an assistant target. Nothing is uploaded.
The JSONL Dataset Validator checks a JSONL file one line at a time. In chat mode it verifies each line is valid JSON with a proper messages array (valid roles, string content, and an assistant training target); in any-JSON mode it just checks JSON validity. It runs entirely in your browser.
Paste JSONL
Drop in your dataset — one JSON object per line.
Choose a mode
Chat fine-tune format, or any JSON per line.
Fix errors
Review the per-line errors and correct them.
100% Private — No Server Required
All processing happens directly in your browser. No data is uploaded, stored, or transmitted to any server.
Last reviewed on June 24, 2026 by the AiTechWorlds Tools Team. All processing runs locally in your browser.
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