How to codable JSON response properly by using Swift 4.2?

Question

My scenario, I am trying to create codable structure for JSON response but I am getting “Type 'Datum' does not conform to protocol 'Decodable' “ error. I made some mistakes in codable but I can’t able to find it. Please check below my response and code and give me the solution.

My Response

{
    "status": 200,
    "message": "Success",
    "country": [
        {
            "id": 1,
            "master": "India",
            "type": 2,
            "active": 1
        },
        {
            "id": 2,
            "master": "US",
            "type": 2,
            "active": 1
        }
    ],
    "cost": 13764,
    "data": [
        {
            "id": 1,
            "user_id": 167,
            "country": 1,
            "card": 1,
            "category": 4,
            "title": “kms”,
            "description": “check”,
            "cost": 444,
            "attachment": "sample.png",
            "create_date": "2019-02-13T00:00:00.000Z",
            "device_id": "1111",
            "app_type": "Android",
            "location": “USA”,
            "user": {
                "firstname": “Mike”,
                "lastname": "P"
            },
            "app_trans_card": {
                "card": “012”
            },
            "app_trans_master": {
                "master": "Domain"
            }
        }
   ]
}

My Code

struct Root: Codable {
    let status: Int
    let message: String
    let cost: Int
    let data: [Datum]

    enum CodingKeys: String, CodingKey {
        case status
        case message = "message"
        case cost
        case data
    }
}

struct Datum: Codable {
    let id, user_id, country, card, category, cost: Int
    let title: String
    let description: String
    let attachment: String
    let create_date: String
    let device_id: String
    let app_type: String
    let location: String

    let user: Fullname
    let app_trans_card: TransactionCard
    let app_trans_master: TransactionMaster

    enum CodingKeys: String, CodingKey {
        case id = "id"
        case user_id = "user_id"
        case country = "country"
        case card = "card"
        case category = "category"
        case cost = "cost"
        case title, description, attachment, create_date, device_id, app_type, location, fullname, transactionCard, transactionMaster
    }
}

struct Fullname: Codable {
    let firstname, lastname: String
}

struct TransactionCard: Codable {
    let card: String
}

struct TransactionMaster: Codable {
    let master: String
}

Make sure you are getting let id, user_id, country, card, category, cost: Int values as Int Please check making those param as String — Shubham bairagi
– Shubham bairagi, Commented Feb 18, 2019 at 6:48

devmikle · Accepted Answer · 2019-02-18 07:24:59Z

1

I have found some problem if you JSON which is related with ” at many places and it should be " so first correct that and then your JSON will be:

{
    "status": 200,
    "message": "Success",
    "country": [
        {
            "id": 1,
            "master": "India",
            "type": 2,
            "active": 1
        },
        {
            "id": 2,
            "master": "US",
            "type": 2,
            "active": 1
        }
    ],
    "cost": 13764,
    "data": [
        {
            "id": 1,
            "user_id": 167,
            "country": 1,
            "card": 1,
            "category": 4,
            "title": "kms",
            "description": "check",
            "cost": 444,
            "attachment": "sample.png",
            "create_date": "2019-02-13T00:00:00.000Z",
            "device_id": "1111",
            "app_type": "Android",
            "location": "USA",
            "user": {
                "firstname": "Mike",
                "lastname": "P"
            },
            "app_trans_card": {
                "card": "012"
            },
            "app_trans_master": {
                "master": "Domain"
            }
        }
   ]
}

Now you can create your Codable protocol with THIS site and code it will look like:

struct Root: Codable {
    let status: Int
    let message: String
    let country: [Country]
    let cost: Double
    let data: [Datum]
}

struct Country: Codable {
    let id: Int
    let master: String
    let type, active: Int
}

struct Datum: Codable {
    let id, userID, country, card: Int
    let category: Int
    let title, description: String
    let cost: Double
    let attachment, createDate, deviceID, appType: String
    let location: String
    let user: User
    let appTransCard: AppTransCard
    let appTransMaster: AppTransMaster

    enum CodingKeys: String, CodingKey {
        case id
        case userID = "user_id"
        case country, card, category, title, description, cost, attachment
        case createDate = "create_date"
        case deviceID = "device_id"
        case appType = "app_type"
        case location, user
        case appTransCard = "app_trans_card"
        case appTransMaster = "app_trans_master"
    }
}

struct AppTransCard: Codable {
    let card: String
}

struct AppTransMaster: Codable {
    let master: String
}

struct User: Codable {
    let firstname, lastname: String
}

edited Feb 18, 2019 at 7:24

devmikle

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answered Feb 18, 2019 at 6:47

Dharmesh Kheni

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8 Comments

devmikle Over a year ago

Great @Dharmesh Kheni. Thank you.

Dharmesh Kheni Over a year ago

Don't forget to accept the answer if it helps... :)

devmikle Over a year ago

I am getting dataCorrupted(Swift.DecodingError.Context(codingPath: [CodingKeys(stringValue: "cost", intValue: nil)], debugDescription: "Parsed JSON number <1283.5> does not fit in Int.", underlyingError: nil)) @Dharmesh Kheni

Dharmesh Kheni Over a year ago

Show your JSON

devmikle Over a year ago

Changed cost Int to Double everything working fine now :). Thanks dude

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