Hashtables resulting from ConvertFrom-JSON -AsHashtable have case sensitive keys #6928

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1. markekraus commented on May 24, 2018

   

   Mark Kraus (markekraus)

   on May 24, 2018

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   Bill Easton (@strawgate) Case sensitivity is by design to accommodate case sensitive key names:

   {
     "key1": "value1",
     "KEY1": "value2"
   }

   This is documented in -AsHashtable fdocumentation:

   https://docs.microsoft.com/en-us/powershell/module/microsoft.powershell.utility/convertfrom-json?view=powershell-6#optional-parameters

   If the JSON contains a list with keys that only differ in casing. Without the switch, those keys would be seen as identical keys and therefore only the last one would get used.
2. Mark Kraus (markekraus)

   closed this as completedon May 24, 2018
3. Mark Kraus (markekraus)

   added

   Resolution-By DesignThe reported behavior is by design.The reported behavior is by design.

   on May 24, 2018
4. strawgate commented on May 24, 2018

   

   Bill Easton (strawgate)

   on May 24, 2018

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   Case sensitive hashtables are not the norm elsewhere --

   group-object -AsHashTable does not produce case sensitive hashtables and neither does @{} with group-object being the reference for justifying the behavior and flag that was used.

   I guess i'll leave this as a fun warning to anyone else using this cmdlet

   $test1 = @{"Test"=1} | convertto-json | convertfrom-json -ashashtable
   $test1.containsKey("test") # False
   

   $test2 = @{"Test"=1}
   $test2.containskey("test") # True
   
5. markekraus commented on May 24, 2018

   

   Mark Kraus (markekraus)

   on May 24, 2018

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   Case sensitive hashtables are not the norm elsewhere

   Yes, but -AsHashTable on convertfrom-json was implemented specifically to address the issue of case sensitive key names among other issues. It's by design and documented as such.

   It probably should have been implemented as case insensitive by default with an option for case sensitive.
6. strawgate commented on May 25, 2018

   

   Bill Easton (strawgate)

   on May 25, 2018

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   Referencing the original PR: #5043