About
JN is a command-line ETL tool that uses NDJSON for streamable data processing. It converts between formats like CSV, JSON, Excel, and YAML, and enables filtering and transformation via Unix pipes. Use it for building data pipelines, format conversion, and integrating with tools like VisiData for visual exploration.
Quick Install
Claude Code
Recommendednpx skills add mattnigh/skills_collection -a claude-code/plugin add https://github.com/mattnigh/skills_collectiongit clone https://github.com/mattnigh/skills_collection.git ~/.claude/skills/jnCopy and paste this command in Claude Code to install this skill
GitHub Repository
Frequently asked questions
What is the jn skill?
jn is a Claude Skill by mattnigh. Skills package instructions and resources that Claude loads on demand, so Claude can perform jn-related tasks without extra prompting.
How do I install jn?
Use the install commands on this page: add jn to Claude Code as a plugin, or clone its repository into your skills directory, then restart Claude so it picks up the skill.
What category does jn belong to?
jn is in the Design category, tagged excel, design and data.
Is jn free to use?
Yes. jn is listed on AIMCP and free to install. It runs inside Claude, so no separate service account is required to use the skill itself.
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