# 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.

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- Markdown: https://listedpress.com/projects/jsonl-co.md
- Site: Listed Press (https://listedpress.com)

Website (nofollow): https://jsonl.co
Logo: https://txmhk1zrnc.ufs.sh/f/xSkWTCqmKWx9gtvzafirjwnlD2SF3fcq5NJU6HXVBd19ehTR
Image: https://txmhk1zrnc.ufs.sh/f/xSkWTCqmKWx9NRQ15Io81aJoSiVHmxAvYheq4GpKsXtBd8l9
Categories: [Data](https://listedpress.com/categories/data), [Developer tools](https://listedpress.com/categories/developer-tools)
Alternatives: [jsonl.co alternatives](https://listedpress.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. Includes free converters, a validator and guides.
## Features
- **Large-file JSONL viewer.** Streams .jsonl, .ndjson and .json files of 1GB+ in the browser and renders visible rows.
- **Local-first editor and validator.** Shows raw lines beside parsed JSON with syntax highlighting and real-time validation; edit, find and replace lines locally.
- **Converters and utilities.** Includes converters between JSONL, JSON, CSV, Excel and YAML, plus a formatter, validator, splitter, merger and JSON flattener.
## Pricing
- **Free (Free).** Local browser-based viewing, editing and conversion with no upload, account or limits.
## Competitors
- [JSONHero](https://jsonhero.io/)
- [JSON Crack](https://jsoncrack.com/)
- [JSON Formatter & Validator](https://jsonformatter.org/)
- [JSONLint](https://jsonlint.com/)
- [jq](https://jqlang.org/)
- [ConvertCSV JSON to CSV](https://www.convertcsv.com/json-to-csv.htm)
## Publications
- [A Free, Local-First JSONL Viewer and Editor for Large Files](https://listedpress.com/publications/a-free-local-first-jsonl-viewer-and-editor-for-large-files) (2026-11-07). Free online JSONL viewer and editor for 1GB+ JSONL/NDJSON files, with validation, converters, and no upload or sign-up. Product link in the article, anchor “jsonl.co”, to https://jsonl.co. Categories: Data, Developer tools.

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