Error with creating an Array of JSON objects in swift

Question

I am trying to parse a JSON string which is a collection of multiple 'Countries'. I have created a structure representing the fields in each JSON object and then one for the array. However I keep getting the following error

Error: cannot convert value of type 'CountryList' to specified type 'Country'

Here is my Code (written in Swift Playgrounds)

import Cocoa
let body = """
{"Countries":
[
  {
    "id": 1,
    "name": "USA",
    "capitalCity": 5,
  },
  {
    "id": 2,
    "name": "France",
    "capitalCity": 5,
  }]}
""".data(using: .utf8)

struct Country: Codable {

    let id: Int
    let name: String
    let capitalCity: Int
 
    
}
struct CountryList: Codable {
    
    var Countries: [Country]
    
}



let countryJson: Country = try! JSONDecoder().decode(CountryList.self, from: body!)
print(countryJson)

Thank you for your help.

You have declared countryJson to be of type Country, but you are decoding CountryList - You want let countryJson: CountryList = ... — Paulw11
– Paulw11, Commented Feb 16, 2021 at 23:39

The Mach System · Accepted Answer · 2021-02-17 02:02:18Z

1

Replace this line

let countryJson: Country = try! JSONDecoder().decode(CountryList.self, from: body!)

with this:

let countryJson: CountryList = try! JSONDecoder().decode(CountryList.self, from: body!)

answered Feb 17, 2021 at 2:02

The Mach System

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2 Comments

NicolasElPapu Over a year ago

And you also do not need to explicitly declare the type, since it can be inferred.

The Mach System Over a year ago

You're right. It's not needed. But I always prefer leaving the type there in my code to make it clear for my fellow devs.

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