How to combine two arrays by merging each object with jq?

Question

How can I use jq to combine the two files above, into a single array, by merging each object?

I've found combine array of objects from two files with jq under specific key 1.4 but this is for a specific key.

I've tried:

jq -n '{ combined: (transpose | map(add)) }' a.json b.json jq: error (at <unknown>): Cannot iterate over null (null)

Input:

 ==> a.json <== [ { "datetime": "2019-12-08 11:34" }, { "datetime": "2019-12-08 11:35" }, { "datetime": "2019-12-08 12:03" } ] ==> b.json <== [ { "command": "cat test.txt" }, { "command": "cat test2.txt" }, { "command": "cat test3.txt" } ]

Desired output:

 [ { "command": "cat test.txt", "datetime": "2019-12-08 11:34" }, { "command": "cat test2.txt", "datetime": "2019-12-08 11:35" }, { "command": "cat test3.txt", "datetime": "2019-12-08 12:03" } ]

oguz ismail · Accepted Answer · 2021-08-12 07:48:44Z

2

Just slurp them. -n is for null input, and is overkill for this trivial task.

jq -s 'transpose | map(add)' a.json b.json

edited Aug 12, 2021 at 7:48

answered Dec 8, 2019 at 12:46

oguz ismail

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