How to use jq to output JSONL (one independent JSON object per line)

问题

My request sounds trivial but I could not find a way to do it. I have as input an array of JSON objects:

[
    {
        "foo": 1,
        "bar": 2
    },
    {
        "foo": 3,
        "bar": 4
    },
    (...)
]

and I want as output the JSONL version of the same, aka one object per line, not an array:

    { "foo": 1, "bar": 2 }
    { "foo": 3, "bar": 4 }
    (...)

This is not the same as using --compact-output, as that would preserve the array and give me:

    [ { "foo": 1, "bar": 2 }, { "foo": 3, "bar": 4 }, (...) ]

Thank you in advance.

回答1:

The answer to the original question is to use the filter .[] together with the -c command-line option:

$ jq -c '.[]'

回答2:

Found: it's

map(tostring) | reduce .[] as $item (""; . + $item + "\n")

You also need to use --raw-output.

来源：https://stackoverflow.com/questions/42178636/how-to-use-jq-to-output-jsonl-one-independent-json-object-per-line