# jsonl.co

> Free online JSONL viewer & editor. Open, search, validate and edit 1GB+ JSONL/NDJSON files right in your browser. No upload, no sign-up, 100% local.

- Canonical: https://ledepress.com/projects/jsonl-co
- Markdown: https://ledepress.com/projects/jsonl-co.md
- Site: Lede Press (https://ledepress.com)

Website (nofollow): https://jsonl.co
Logo: https://txmhk1zrnc.ufs.sh/f/xSkWTCqmKWx9qfKnnPydfDnaYRZuIMoALgyEwj7cr2xOmXWi
Image: https://txmhk1zrnc.ufs.sh/f/xSkWTCqmKWx9wDe5VJX6rfT9esCQN0u5WXw2itZEJpUzvDGS
Categories: [Data](https://ledepress.com/categories/data), [Developer tools](https://ledepress.com/categories/developer-tools)
Alternatives: [jsonl.co alternatives](https://ledepress.com/projects/jsonl-co/alternatives)
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. It also includes free converters, a validator and guides.
## Features
- **Local JSONL viewing and editing.** Streams large JSONL/NDJSON files in the browser with raw and parsed views, search, editing and real-time validation.
## Pricing
- **Free ($0).** Free browser-based viewer, editor, validator and converters; files stay local and no account is needed.
## Competitors
- [JSON Editor Online](https://jsoneditoronline.org/)
- [JSON Formatter](https://jsonformatter.org/)
- [JSONCrack](https://jsoncrack.com/)
- [JSON Viewer (Stack.hu)](https://jsonviewer.stack.hu/)
- [jqPlay](https://jqplay.org/)
- [Code Beautify JSON Viewer](https://codebeautify.org/jsonviewer)
## Publications
- [Working with large JSONL files in the browser](https://ledepress.com/publications/working-with-large-jsonl-files-in-the-browser) (2026-11-07). A free local-first JSONL viewer and editor for large files, with validation, search and conversion tools. Product link in the article, anchor “jsonl.co”, to https://jsonl.co. Categories: Data, Developer tools.

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