Fetching size or specific value of an object array using JSON path syntax

Following is an example to fetch size or specific value of an object array using JSON path syntax:

Assembly Template

{
          "$$Id": "PackageA",
          "Fields": [
       {             "Name": "CountOfPhones",             "Path":"$.length($.phones[*].type.length())"         }
        ,
       {             "Name": "CountOfTypeAPhones",             "Path":"$.length($.phones[?(@.type== 'TypeA')].length())"         }
       ]
       }

Preview

{    
          "phones": [
         {             "type": "TypeA"         }, 
         {             "type": "TypeB"         },
         {             "type": "TypeC"         }
                     ]
         }

Path with a filter criterion

$.length($.phones[?(@.type== 'TypeA')].length())

Path without a filter criterion

$.length($.phones[*].type.length())