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How to merge json object with same keys?

Here are the 2 items in one array:

{
  "SysID": "12345",
  "Name": "abc"
}
{
  "SysID": "12345",
  "Name": "def"
}
{
  "SysID": "23456",
  "Name": "hij"
}
{
  "SysID": "23456",
  "Name": "klm"
}
{
  "SysID": "23456",
  "Name": "nop"
}

I would like to transform "SysID" into key and "Name" as the value of it in array:

{
  "12345": [
    "abc",
    "def",
  ],
  "23456": [
    "hij",
    "klm",
    "nop",
  ],
}

May I know how could I do that in jq?

Tags:

2

Answers


  1. 0

    Using reduce():

    reduce .[] as $i ({}; .[$i.SysID] += [$i.Name])

    WIll give

    {
  "12345": [
    "abc",
    "def"
  ],
  "23456": [
    "hij",
    "klm",
    "nop"
  ]
}

    When called with --slurp to wrap those object into an array

    JqPlay Demo

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  2. 0

    You can also use group_by to merge

    jq 'group_by(.SysID)|map({(.[0].SysID): map(.Name)})|add'

    $ jq 'group_by(.SysID)'    
[
  [{"SysID":"12345","Name":"abc"},{"SysID":"12345","Name":"def"}],
  [{"SysID":"23456","Name":"hij"},{"SysID":"23456","Name":"klm"},{"SysID":"23456","Name":"nop"}]
]

$ jq 'group_by(.SysID)|map({(.[0].SysID): map(.Name)})'
[
  {"12345":["abc","def"]},
  {"23456":["hij","klm","nop"]}
]

$ jq 'group_by(.SysID)|map({(.[0].SysID): map(.Name)})|add'
{
  "12345": [
    "abc",
    "def"
  ],
  "23456": [
    "hij",
    "klm",
    "nop"
  ]
}
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