NDJSON & JSONL Viewer
Inspect Newline-Delimited JSON files, locate syntax errors on malformed lines, browse structured tabular records, and export to CSV or JSON array.
| Line # | Status | Preview / Columns |
|---|---|---|
| Drop a .jsonl / .ndjson file or load sample data. | ||
Frequently Asked Questions
Why use NDJSON / JSONL instead of standard JSON?
Standard JSON files must be loaded into memory entirely before parsing the closing bracket. NDJSON allows streaming parsers to read records one by one, making it ideal for massive datasets, append-only logs, and parallel pipelines.
What happens when a line has invalid JSON?
The parser tags the line as an Error with the exact syntax violation (e.g. unquoted key, unclosed string, trailing comma). You can click "Errors Only" in the toolbar to isolate all corrupted records.
How does tabular visualization work with varied schemas?
The viewer scans all parsed records, gathers a comprehensive list of all distinct top-level keys, and displays them as columns. Missing keys on specific records display as empty cells.
Is my file uploaded anywhere?
No. 100% of processing and rendering occurs inside your browser tab with zero network transmission.