I wana to do a post request of data stored in json format i tried many wayss from gool but nothing worked

I wana to do a post request of data which is in json format like this

 `{
     "data": [
         {
             "characterName": "Gwen",
             "MaxHealth": 100,
             "Speed": 10
         },
         {
             "characterName": "Mario",
             "MaxHealth": 150,
             "Speed": 12
         },
         {
             "characterName": "Ben",
             "MaxHealth": 500,
             "Speed": 20
         }
     ]
 }

can anyone help me through this