AI SummaryJN is a command-line ETL tool for data transformation using NDJSON as a universal format, enabling developers to filter, convert, and stream data across CSV/JSON/Excel/YAML formats with Unix pipes.
Install
Copy this and paste it into Claude Code, Cursor, or any AI assistant:
I want to install the "jn" skill in my project. Please run this command in my terminal: # Install skill into your project (2 files) mkdir -p .claude/skills/jn && curl --retry 3 --retry-delay 2 --retry-all-errors -o .claude/skills/jn/SKILL.md "https://raw.githubusercontent.com/majiayu000/claude-skill-registry/main/skills/data/jn/SKILL.md" && curl --retry 3 --retry-delay 2 --retry-all-errors -o .claude/skills/jn/metadata.json "https://raw.githubusercontent.com/majiayu000/claude-skill-registry/main/skills/data/jn/metadata.json" Then restart Claude Code (or reload the window in Cursor) so the skill is picked up.
Description
Use JN for data transformation and ETL. Read data with 'jn cat', filter with 'jn filter', write with 'jn put'. Convert between CSV/JSON/Excel/YAML formats. Stream data through Unix pipes. Integrate with VisiData for visual exploration. Use when working with data files, format conversion, filtering data, or ETL pipelines.
2. Open in VisiData (see visidata skill for interactive usage)
jn vd /tmp/explore.csv
JN Data Pipeline Tool
JN is a command-line ETL tool that uses NDJSON (newline-delimited JSON) as a universal data format. Chain commands with Unix pipes to build data pipelines.
Core Concept
All JN commands communicate via NDJSON: ` {"name": "Alice", "age": 30} {"name": "Bob", "age": 25} ` One JSON object per line = streamable, memory-efficient data processing.
1. jn cat - Read Data
Read any data source, output NDJSON: `bash
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