jq pass an array that should be converted into json array

Question

I have script

#!/bin/bash
ARR=("a" "b")

collection_init_msg=$( jq -n --arg arr $ARR '{arr: [$arr]}')

echo some command "$collection_init_msg"

that should convert the ARR and print it as a JSON array.

Current result

some command { "arr": [ "a" ] }

What I want is:

some command { "arr": [ "a", "b" ] }

$ARR is exactly the same as ${ARR[0]}. You can't pass the entire array as a single value; you can only pass a single string built from the elements of the array. — chepner
– chepner, Commented Dec 2, 2022 at 23:41

peak · Accepted Answer · 2022-12-03 09:50:31Z

5

#!/bin/bash
ARR=("a" "b")

collection_init_msg=$( jq -nc '{arr: $ARGS.positional}'  --args "${ARR[@]}"  )

echo "$collection_init_msg"

In answer to the supplementary question in the comment: one could do worse than:

jq -n --argjson a1 $(jq -nc '$ARGS.positional' --args "${A1[@]}") '
  {$a1, a2: $ARGS.positional}' --args "${A2[@]}"

edited Dec 3, 2022 at 9:50

answered Dec 2, 2022 at 23:15

peak

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2 Comments

tot Over a year ago

Is it possible to submit multiple arrays? E.g. #!/bin/bash ARR1=("a" "b") ARR2=("1" "2") and have an output like { "arr1": [ "a", "b" ], "arr2" ["1", "2"] }

peak Over a year ago

@tot - See addendum.

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