Input vs output formats for groups

The object representation of groups appear to be different between the format requires for sending messages, and the format received on the other end. For example, a sent group will be

groups: [
      {
        index: 453,
        delim: 447,
        entries: [
          {
            447: 'D',
            448: 'demo-9',
            452: '3'
          },
          {
            447: 'D',
            448: 'demo-8',
            452: '1'
          }
        ]
      },
...
    ]

But on the received side, it will be

groups: { 
     '453':
      [ { tags: { '447': 'D', '448': 'demo-9', '452': '3' } },
        { tags: { '447': 'D', '448': 'demo-8', '452': '1' } } 
      ] 
}

Are these formats documented somewhere? Is there a library to convert one to the other if I want to compare a sent message to the corresponding received message on the other side?

Thanks!

[JVaghela-Fintech]

It is a bit confusing to send and receive messages...we are stuck in deadline time. it would be really helpful to us if you provide a sample for send and receiving messages.