jq print key and value for all in sub-object

Simply pipe to keys function:

Sample input.json:

{
    "connections": {
        "host1": { "ip": "10.1.2.3" },
        "host2": { "ip": "10.1.2.2" },
        "host3": { "ip": "10.1.18.1" }
    }
}

jq -r '.connections | keys[] as $k | "\($k), \(.[$k] | .ip)"' input.json

The output:

host1, 10.1.2.3
host2, 10.1.2.2
host3, 10.1.18.1

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