Merge JSON arrays based on arbitrary keys to arrays-CodePudding

Using jq or jtc, I'd like to take a list of json files as inputs and generate a single json file based on the keys to the arrays found in each input file. Example:

1st file:

{
  "key1": [
    "key1-out1"
  ]
}

2nd file:

{
  "key1": [
    "key1-out2"
  ]
}

3rd file:

{
  "key2": [
    "key2-out1"
  ]
}

Expected output:

{
  "key1": [
    "key1-out1"
    "key1-out2"
  ],
  "key2": [
    "key2-out1"
  ]
}

I encountered this almost perfectly good answer but I can't use it directly because I don't know what keys I will get in each input file.

CodePudding user response：

In case any of the files has more than one key:

jq -n 'reduce inputs as $in ({}; 
        reduce ($in|keys_unsorted)[] as $k (.;
         .[$k]  = $in[$k]))'  file1 file2 file3 # ...

You might want to tweak this so it doesn't fail if the value associated with a key is unexpectedly not an array.

And if you use gojq (the Go implementation of jq), you would use keys rather than keys_unsorted.