What is JSONL?
JSONL (JSON Lines) is a text format where each line is a valid JSON value,
typically a JSON object. It's commonly used for:
- Log files — Structured application logs
- Data exports — Database dumps and API responses
- ML datasets — Training data for machine learning
- Streaming data — Real-time event streams
How to Use
- Drop a .jsonl, .ndjson, or .json file onto the upload area
- View entries with syntax highlighting
- Click an entry to expand/collapse its full JSON
- Use search to filter entries by content
- Copy individual entries or all data
Features
- Syntax highlighting for JSON
- Pagination for large files
- Search/filter entries
- Expand/collapse all entries
- Copy to clipboard
- Error reporting for invalid lines
Privacy
Your files are processed entirely in your browser. No files are
uploaded to any server. This tool is 100% client-side.