How do i parse custom JSON Data - ios

Question

Here i provide the code worked sample as per the guideline given below and seems to get null values.
Here is my complete JSON Data,
some: {
"success": true,
"data":
[
{
"15-10-2020": [
{
"id": 100,
"details": {
"_id": 1,
"_title": "My Title"
},
"created_at": "2020-10-15"
},
{
"snf_id": 101,
"details": {
"_id": 1,
"_title": "My Title"
},
"created_at": "2020-10-15"
},
{
"snf_id": 102,
"details": {
"_id": 1,
"_title": "My Title"
},
"created_at": "2020-10-15"
}
],
"30-09-2020": [
{
"snf_id": 301,
"details": {
"_id": 8,
"_title": "My Title"
},
"created_at": "2020-09-30"
}
]
}
],
"message": "Successfully Retrieved"
}
struct Response : Codable {
var success : Bool?
var data : [Data]?
var message : String?
}
struct Data: Codable {
var snf_id: Int?
var details: Details?
var created_at: String?
}
// MARK: - Details
struct Details: Codable {
var _id: Int?
var _title: String?
}
let Response = try JSONDecoder().decode(Response.self, from: data)
Returns null value for data,
▿ Response
▿ success : Optional
- some : true
▿ data : Optional<Array>
▿ some : 1 element
▿ 0 : Data
- snf_id : nil
- details : nil
- created_at : nil
▿ message : Optional
- some : "Successfully Retrieved"

Answer 1

There is no myData key in your json , your json top structure is an array that contains elements where every element value is an array like [[String: [Root]]]
struct Root: Codable {
let id: Int?
let details: Details
let createdAt: String
let snfID: Int?
enum CodingKeys: String, CodingKey {
case id, details
case createdAt = "created_at"
case snfID = "snf_id"
}
}
// MARK: - Details
struct Details: Codable {
let id: Int
let title: String
enum CodingKeys: String, CodingKey {
case id = "_id"
case title = "_title"
}
}
And to decode
let res = try JSONDecoder().decode([[String: [Root]]].self,from:data)

Answer 2

some: {
"success": true,
"data":
[
{
"15-10-2020": [
{
"id": 100,
"details": {
"_id": 1,
"_title": "My Title"
},
"created_at": "2020-10-15"
},
{
"snf_id": 101,
"details": {
"_id": 1,
"_title": "My Title"
},
"created_at": "2020-10-15"
},
{
"snf_id": 102,
"details": {
"_id": 1,
"_title": "My Title"
},
"created_at": "2020-10-15"
}
],
"30-09-2020": [
{
"snf_id": 301,
"details": {
"_id": 8,
"_title": "My Title"
},
"created_at": "2020-09-30"
}
]
}
],
"message": "Successfully Retrieved"
}
struct Response : Codable {
var success : Bool?
**var data : [[String:[Data]]]?**
var message : String?
}
struct Data: Codable {
var snf_id: Int?
var details: Details?
var created_at: String?
}
// MARK: - Details
struct Details: Codable {
var _id: Int?
var _title: String?
}
let Response = try JSONDecoder().decode(Response.self, from: data)