{
     "item1": {
         "key1": "val1"
         "key2": "val2"
         "key3": [
             "key4": "val4"
             "key5": "val5"
         ]
    },
    {
     "item2": {
         "key1": "val1"
         "key2": "val2"
         "key3": [
             "key3": "val3"
             "key4": "val4"
         ]
    }

    ... etc ...
}

interface MyObj {
    key1: string;
    key2: string;
    key3: string[];
}

const myObj[]: {string: Myobj[]} = JSON.parse(response);