Merge two objects

Deep merge two JSON objects (right wins on conflicts)

jq -s '.[0] * .[1]' base.json override.json
tool
jq17 commands
tags
jq

More jq commands

  • Extract nested value safely
    jq '.config?.database?.host // "localhost"' config.json

    Optional chaining with fallback default value

  • Sort by numeric field
    jq 'sort_by(.timestamp) | reverse | .[0:5]' events.json

    Get 5 most recent events sorted by timestamp descending

  • Convert JSON to CSV
    jq -r '.[] | [.id, .name, .status] | @csv' data.json

    Output selected fields as comma-separated values

  • Add field to every element
    jq '[.[] | . + {"env": "prod"}]' items.json

    Inject a new key-value pair into every array element

  • Walk and transform all strings
    jq 'walk(if type == "string" then ascii_downcase else . end)' data.json

    Recursively lowercase all string values in a JSON document

all 17 jq commands