JSONL Validator
Check each line of a JSONL file for valid JSON and see line-level error messages.
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Validate JSON Lines line by line
Paste or upload a JSONL or NDJSON file and see which lines parse as JSON. Invalid lines show the parser error and line number so you can fix export pipelines quickly.
Related: JSON Lines to JSON and CSV to NDJSON.
Frequently Asked Questions
Must every line be an object?
Each line may be a JSON object or array. Scalars on a line are reported as invalid for typical JSONL usage.
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