jq
Introduction
This cheat sheet provides a quick reference for some common jq
commands and concepts. jq
is a command-line utility used for processing and manipulating JSON data.
jq
Concepts
Selecting Data
jq
allows you to select specific data from JSON.
Select a specific field:
jq '.field_name' input.json
Select nested fields:
jq '.parent_field.child_field' input.json
Filtering Data
You can filter JSON data based on conditions.
Filter data by a specific condition:
jq '.[] | select(.field_name == "value")' input.json
Filter data by array elements:
jq '.array_field[] | select(.field_name == "value")' input.json
Modifying Data
jq
allows you to modify JSON data.
Update a field:
jq '.field_name = "new_value"' input.json
Add a new field:
jq '.new_field = "value"' input.json
Arrays
You can work with arrays in JSON.
Get the length of an array:
jq 'length' input.json
Iterate over array elements:
jq '.[]' input.json
Pipes
You can pipe multiple jq
operations together.
- Chain multiple operations:
jq '.field | .[] | select(.value > 10)' input.json
jq
Command-Line
Select a specific field from JSON:
jq '.field_name' input.json
Filter data by a condition:
jq '.[] | select(.field_name == "value")' input.json
Update a field in JSON:
jq '.field_name = "new_value"' input.json
Get the length of an array in JSON:
jq 'length' input.json
Pipe multiple
jq
operations together:jq '.field | .[] | select(.value > 10)' input.json
Conclusion
This cheat sheet covers some common jq
commands and concepts. jq
is a versatile tool for processing and manipulating JSON data, making it useful for tasks like data extraction, filtering, and transformation; refer to the official jq
documentation for more in-depth information and advanced usage.