JSONL Validator
Validate JSON Lines row by row, catch broken records, and copy clean JSONL locally.
JSONL validator workspace
Validate one JSON value per line and copy a clean JSONL file.
JSONL input
Clean JSONL
Validation
Ready
Every nonblank line parses as JSONL and the clean output is ready to copy.
Questions
What is JSONL?
JSONL, also called JSON Lines or NDJSON, stores one complete JSON value per line.
Does JSONL Validator upload my data?
No. Every row is parsed locally in the browser tab and no model call is made.
Can it check AI dataset rows?
Yes. It can require object rows and warn when later rows do not use the same keys as the first valid row.
Does Utilumo upload my input?
No. Utilumo has no backend that could receive your input. Where a tool makes a request as part of its function, it goes directly from your browser to the destination you choose, never through Utilumo.
Do I need an account?
No. Utilumo tools are built to work without accounts or sign-in.