Valid JSONL
- {"id":1,"name":"Ada"}
- {"id":2,"name":"Grace"}
format validator
JSONL / NDJSON Validator
Validate newline-delimited JSON records in your browser with line-precise errors.
Results
Processing…- Status
- Processing...
- Details
- Processing...
- Total lines
- Processing...
- Records parsed
- Processing...
Rules & checks
Parses each non-empty line as JSON.
Flags the exact line number on the first parse error.
Checks top-level object schema consistency across records.
Runs entirely in your browser; no uploads or persistence.
When to use it
- Preflight data imports for analytics or BI
- Validate streaming logs or exports before loading
- Check user-provided NDJSON uploads in support flows
Tips
- Keep one JSON object per line; avoid trailing commas
- Add a trailing newline to make editors happier
Examples
Bad line
- {"id":1,"name":"Ada"
- {"id":2,"name":"Grace"} -> line 1 flagged
Schema mismatch
- {"id":1,"name":"Ada"}
- {"id":2,"fullName":"Grace"} -> flagged
FAQs
- Do you store my data?
- No. Parsing happens locally and clears on refresh.
- Do you fetch schemas?
- No. It checks structure and optional key consistency only.
Related validators
Structure and basic schema consistency only; does not validate against external schemas.