Skip to content
Project Radar
Developer Tools

jsonl.co

jsonl.co is a free JSONL viewer and editor that runs in the browser.

jsonl.co logo
Visit project

Project overview

The short version

Read the full Project Note

jsonl.co is a free JSONL viewer and editor that runs in the browser. You can drop in a .jsonl, .ndjson, .json or .txt file, paste text, or type, and it streams files up to 1 GB with syntax highlighting and real-time validation. Around the viewer sit converters between JSONL and JSON, CSV, YAML and Excel, plus a formatter, validator, flattener, splitter and merger. The site says files stay on your device, needs no sign-up, and also offers a VS Code extension.

Project facts

Project details

Category
Developer Tools
Type
Not listed
Platforms
See Project Note
Pricing
See Project Note
Availability
Other
Published
Nov 6, 2026

Details come from the published Project Note and named sources. Check the project site for current terms. The Note may have more context when a fact isn't recorded here.

Before you visit

Good to know

Built for

  • Developers, data engineers and ML practitioners who need to inspect or fix large log, dataset or fine-tuning files quickly.

More to explore

Related projects

Developer Tools

JSONViewerTool

A browser workspace with side-by-side JSON editors, tree views, syntax checks, comparisons and format converters.

Websites

Markovo

A hosted file-to-Markdown converter with asset bundles, developer interfaces and signed-in beta formats.

Web, API · Free and paid options: A no-card free plan includes monthly credits; paid Starter and Pro subscriptions and one-time credit packs add capacity.

Keep reading

Related links

Project noteContext standardsDeveloper Tools category

Profile tools

Featured badgeShare kitManage this profileRequest correction

Building something useful?

Submit your project for free. If selected, it gets a profile that explains what it does and links to your work. Publication isn't guaranteed.

Submit a project