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
2 valid rows3 keys0 issues
Ready
Every nonblank line parses as JSONL and the clean output is ready to copy.
JSONL is parsed line by line in this browser tab. No upload or model call is made.
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. This tool is designed for local browser processing and does not send your input to a server.
Do I need an account?
No. Utilumo tools are built to work without accounts or sign-in.