Online JSONL Viewer & Editor
Gigabytes. Local first.
View and edit JSONL files up to 1GB instantly in your browser. No uploads, no sign-up. Your data never leaves your device.
Drop your JSONL file here, or click to browse
Supports .jsonl, .ndjson, .json, .txt — up to 1GB
Paste JSONL and press Ctrl+Enter
Why jsonl.co?
Handle Gigabyte Files
Stream and view JSONL files up to 1GB+. No crashes, no freezing — powered by streaming technology.
100% Private & Secure
All processing happens locally in your browser. Your JSONL data never leaves your device.
Free Forever
No sign-up, no limits, no hidden fees. A completely free JSONL viewer and editor.
Full JSONL Format Support
View, edit, and validate JSONL (JSON Lines), NDJSON, and standard JSON files with syntax highlighting.
Side-by-Side View
Raw JSONL on the left, parsed JSON on the right. Edit and preview in real time with synchronized scrolling.
Multi-Language Support
Available in multiple languages. The same powerful JSONL tool, localized for developers worldwide.
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