~/tools / jsonl-inspector

JSONL dataset inspector

Bad training data fails silently: one malformed line, a few duplicates, a role imbalance you never noticed. Paste your JSONL and get the checks that matter — parse errors, dupes, token distribution with p95, role mix — computed entirely in your browser. Your data never touches a server.

TOOL 05

JSONL dataset inspector

I built agents that make training data — this is the sanity check

paste fine-tuning JSONL — one {"messages":[…]} per line

Checks the things that silently ruin a fine-tune: parse errors, duplicate rows, role imbalance, token-length outliers. All local — your data never leaves the tab.

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