ProductDeveloper Tools
jsonl.co
Free JSONL viewer and editor in your browser, built for large files
Why it exists
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.
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