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jq — JSON Processor
jq
JSON processor for filtering, transforming, and manipulating JSON data in command line.
SKILL.md
Full skill instructions
jq — JSON Processor
Basic Operations
# Pretty-print JSON
jq '.' file.json
# Filter specific field
jq '.fieldName' file.json
# Filter array element by index
jq '.[index]' file.json
# Output all elements from arrays
jq '.[*]' file.json
# Parse from stdin
cat file.json | jq '.fieldName'
# Load JSON from URL
curl -s "http://example.com/file.json" | jq '.fieldName'
Filtering & Transformation
# Select multiple fields
jq '{field1: .field1, field2: .field2}' file.json
# Query nested data
jq '.outerField.innerField' file.json
# Filter by condition
jq 'select(.fieldName == "value")' file.json
# Modify field value
jq '.fieldName = "newValue"' file.json
# Delete a field
jq 'del(.fieldName)' file.json
Array Operations
# Count elements
jq '.arrayName | length' file.json
# Apply function to each element
jq '.arrayName[] | .fieldName' file.json
# First element
jq '.[0]' file.json
# First element's key
jq '.[0].key_name' file.json
Advanced
# Concatenate fields
jq '.field1 + " " + .field2' file.json
# Group by field
jq 'group_by(.fieldName)' file.json
# Sort by field
jq 'sort_by(.fieldName)' file.json
# Find unique values
jq 'unique' file.json
# Print keys and values
jq 'to_entries | .[] | "\(.key): \(.value)"' file.json
# Combine two JSON files
jq -s '.[0] + .[1]' file1.json file2.json
# Compact output (no whitespace)
jq -c '.' file.json
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