Jo

Jo Plugin

JSON output from a shell — create JSON objects, arrays, and nested structures from key=value pairs.

Commands

Self

• jo self version — Print version

JSON

• jo json create — Create JSON from key=value pairs (passthrough)

Passthrough

• jo _ _ — Passthrough for any jo command

Usage Examples

• "Create a JSON object with name and age"
• "Build a JSON array from a list of values"
• "Convert shell variables to JSON format"
• "Create a nested JSON structure for an API request"

Installation

brew install jo

Examples

# Simple object
jo name=John age=30 active=true

# Nested objects
jo name=John address="city=New York zip=10001"

# Arrays
jo -a name=John name=Jane

# Reading from stdin
echo 'name=Doe' | jo

# Boolean and numbers
jo enabled=true count=42 ratio=3.14

# Empty value (null)
jo name=John title=

# Combine with jq for complex pipelines
jo name=John items="$(jo -a apple banana)" | jq '.items'

Key Features

• Simple key=value syntax for JSON creation
• Automatic type detection (strings, numbers, booleans)
• Nested objects and arrays
• stdin input support
• Pretty-print option
• Array forcing with -a flag
• Null value support via empty values