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JSON Lines Validator

Paste JSON Lines data to validate every non-empty line and turn valid records into a formatted JSON array without uploading them.

Find the exact invalid line, then export valid records as one JSON array.

✓ Tool inputs are processed in your browser✓ No account
Validate JSONL records line by line locally.

Validate JSONL and NDJSON files line by line

Paste newline-delimited JSON to find the first invalid record before an import, analysis job or API test. Valid records can be converted to one JSON array locally.

  1. Pinpoint a malformed record in a JSONL export.
  2. Validate newline-delimited API samples before an import.
  3. Convert valid NDJSON records into a formatted JSON array.
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FAQ

Questions

Questions

Are JSONL and NDJSON the same format?

Both commonly mean one complete JSON value per line, which is the format this tool validates.

Does the validator upload my data?

No. Parsing and conversion happen locally in your browser.

How are invalid records reported?

The first invalid record is reported with its original line number and the browser JSON parser message.