JSON Lines Validator
Verify newline-delimited JSON (NDJSON / JSON Lines) data streams line-by-line and catch formatting errors instantly.
3 Lines Checked
Validation Standard
1. Line-by-Line Rule
Every non-empty row in a JSON Lines file must represent an independent, self-contained, and completely valid JSON object or value.
2. Error Isolation
This tool pinpoints the exact line number where syntax infractions occur, helping you debug large log or dataset files efficiently.
Frequently Asked Questions (FAQ)
Blank or whitespace-only lines are ignored by the validator and do not cause parsing failures, adhering to standard NDJSON specifications.
Common errors include missing quotation marks around keys, trailing commas inside objects, unescaped control characters, or mismatched brackets.
Yes, completely secure. All checks run entirely inside your browser via local client-side scripts. No data is ever transmitted or stored on external servers.