Tool overview
What is a JSONL / NDJSON Validator?
A JSONL validator checks newline-delimited JSON line by line, reporting which rows fail and why.
Why use this JSONL Validator?
Clean log exports, ML datasets, and streaming API dumps locally before upload or batch processing.
Key Features
Per-line errors, record counts, clean-line export, and private browser-side validation.
How to Use
Follow these steps to get accurate results from the tool interface above.
- Paste newline-delimited JSON (one value per line).
- Run Process to validate every row—errors cite line numbers.
- Review the report panel for valid line counts and failure details.
- Copy clean lines or pipe valid records into CSV/JSON tools.
JSONL Syntax Reference
NDJSON rules for streaming JSON records.
| Feature / Context | Valid Syntax Example | Common Pitfall / Invalid Example |
|---|---|---|
| One JSON value per line | {"id":1}
{"id":2} | [{"id":1},{"id":2}]JSONL is not a JSON array—each line must stand alone. |
| No trailing commas | {"a":1} | {"a":1,}Trailing commas invalidate individual lines. |
| Blank lines | {"id":1}
{"id":2} | {"id":1}
undefinedBlank lines are skipped; non-JSON text fails validation. |
Frequently Asked Questions
Expandable answers for common debugging bottlenecks and data privacy questions.
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Official Documentation & References
Authoritative specifications and platform documentation for this utility.