jsonl.co
Free JSONL viewer and editor for large files, in your browse
Developer ToolsFree#jsonl
Launches Nov 22, 2026 at 00:00 UTC
What is jsonl.co?
jsonl.co is a free, local-first JSONL viewer and editor. It streams .jsonl, .ndjson and .json files of 1GB+ straight in your browser with syntax highlighting, real-time validation and a side-by-side raw/parsed view. Nothing is uploaded and no account is needed.
jsonl.co features
- Streams .jsonl, .ndjson and .json files of 1GB+ in your browser
- Syntax highlighting and real-time validation
- Side-by-side raw and parsed view
Who uses jsonl.co and for what
- Developers inspecting large JSONL and NDJSON datasets
- Data teams reviewing sensitive files without uploading them
jsonl.co FAQ
Is jsonl.co free?
Yes. It is a free, local-first viewer and editor and no account is needed.
Are my files uploaded?
No. Nothing is uploaded; files are processed in your browser.
How large a file can it open?
It streams .jsonl, .ndjson and .json files of 1GB+ in your browser.
Comments (0)
No comments yet. Ask the maker a question or share how you would use it.
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