это правильный синтаксис вашего объекта JSON.
[
{ "id": 1,
"type": "group"
},
{
"id": 2,
"type": "text",
"label": "Name",
"group_id": 1
},
{ "id": 3,
"type": "text",
"label": "Address",
"group_id": 1
},
{ "id": 4,
"type": "text",
"label": "City",
"value": "Lahore",
"group_id": 1
},
{ "id": 5,
"type": "text",
"label": "State",
"value": "Punjab",
"group_id": 1
},
{ "id": 6,
"type": "text",
"label": "Country",
"value": "Pakistan",
"group_id": 1
},
{
"id": 7,
"type": "group"
},
{
"id": 8,
"type": "date",
"label": "Date of birth",
"group_id": 7
},
{ "id": 9,
"type": "email",
"label": "Email",
"group_id": 7
},
{
"id": 10,
"type": "phone",
"label": "Phone",
"group_id": 7
},
{
"id": 11,
"type": "color",
"label": "Color",
"value": "#ff9900",
"group_id": 7
},
{
"id": 12,
"type": "number",
"label": "Age",
"value": 22,
"group_id": 7
},
{
"id": 13,
"type": "number",
"label": "Friends",
"value": 3,
"group_id": 7
},
{ "id": 14,
"type": "select_one",
"label": "Select One City",
"value": "karachi",
"choices": [
"lahore",
"karachi",
"multan",
"faisalabad",
"pishawar",
"queta",
"islamabad"
],
"group_id": 7
},
{
"id": 15,
"type": "select_one",
"label": "Select One Fruit",
"value":"peach",
"choices": [
"apple",
"banana",
"mango",
"peach",
"grapes",
"pine",
"strawberry"],
"group_id": 7 }
]