如何使用一些动态函数从MongoDB文档中获取所有键？

Question

我是mongodb的新手，根据要求我需要从中获取所有密钥 使用一些动态函数在MongoDB文档或任何其他文档下面。

MongoDB示例文档：

{
      "encryption": {
        "alg":"AES",
        "encryption_key":"lkjhsdflkhsdfwe22348423"
      },
      "domain": "PBTV",
          "detokenObject": [{ 
            "client": {
              "FORENAMES":"^^^ABCDEFG",
              "SURNAME":"^^^ABCDFHE",
              "COUNTRY":"England",          
            "transactions": [ 
              {  
                "TYPE":"buy",
              },
              {  
                "TYPE":"sell",
                "AMT":"1000"
              },{
                "AMT":"1000000000000000001"
              }
            ]
          } ,
            "client1": {
              "SURNAME":"^^^ABCDFHE",
              "COUNTRY":"England",          
            "transactions": [ 
              {  
                "TYPE":"buy",
                "ASSET":"NYSE:APPL",
                "AMT":"100"
              },
              {  
                "TYPE":"sell",
                "ASSET":"NYSE:APPL",
                "AMT":"1000"
              }
            ]     
        }
        }]
    }

请提供任何解决方案？