Getting undefined value , when I am trying to read brooklynCatalog ["brooklyn.catalog"] from Json

var brooklynCatalog = {
   "services":[
      {
         "type":"com.canopy.compose.entity.mongodb:1.3"
      }
   ],
   "brooklyn.catalog":{
      "id":"75d01e46-50ef-43ca-b60b-11af8c1ec8de.cfsb.testing",
      "version":"1.0",
      "description":"test",
      "displayName":"testing",
      "iconUrl":"https://www.google.de/images/branding/googlelogo/2x/googlelogo_color_272x92dp.png",
      "itemType":"template"
   },
   "brooklyn.config":{
      "broker.config":{
         "plans":[
            {
               "name":"medium",
               "description":"medium",
               "config":{

               },
               "location":"AWS Sydney"
            }
         ],
         "metadata":{
            "displayName":"testing"
         }
      }
   }
}

via sonam Dwivedi