JSON Lines Formatter
Format newline-delimited JSON records into readable one-record-per-line output.
What the JSON Lines Formatter does
Format newline-delimited JSON records into readable one-record-per-line output. A log sample can turn compact NDJSON rows into indented records for inspection Adjust the controls and the preview updates immediately, so you can dial in exactly what you want and copy the result straight into your project — no build step and no account.
One thing to keep in mind: Each line must be valid JSON; this does not repair malformed records.
Private and in your browser
Everything runs locally in your browser. Your input is never uploaded, so the tool stays fast and works offline, and the copy and download buttons always use the current result shown in the output panel.
Frequently Asked Questions
What does the JSON Lines Formatter do?
Format newline-delimited JSON records into readable one-record-per-line output. A log sample can turn compact NDJSON rows into indented records for inspection.
What should I keep in mind?
Each line must be valid JSON; this does not repair malformed records
Does it upload my input?
No. The JSON Lines Formatter runs entirely in your browser — your input is never uploaded, and it keeps working offline once the page has loaded.
Practical utilities for front-end design and implementation work.