Difficulty in accessing json data from jsonbin [duplicate]

Question

I use code that downloads and displays json data from a number of different public json sites such as Apple Music and jsonplaceholder. I have some test data in a bin at jsonbin.io. When I use the same code I cannot get the data to populate a list in SwiftUI. The test data is a public json and is non-sensitive. Any idea what I am doing wrong?

struct Facility: Codable, Identifiable {
var id: String
var facilityName: String
}


struct FacilityView: View {


@State private var facilities = [Facility]()

var body: some View {
    NavigationView {
    List(facilities, id: \.id) {item in
        VStack {
            Text(item.id)
                .font(.headline)
            Text(item.facilityName)
            }
        }
    .navigationTitle("Facilities")
    
    .task {
        await fetchData()
    }
}
}

func fetchData() async {
    guard let url = URL(string: "https://api.jsonbin.io/v3/b/66130dbead19ca34f85689bc") else {
        print("URL does not work")
        return
        }
    do {
        let (data, _) = try await URLSession.shared.data( from: url)

        if let decodedResponse = try? JSONDecoder().decode([Facility].self, from: data) {
            facilities = decodedResponse
        }
    } catch {
        print("Data not valid")
    }
}
}

#Preview {
FacilityView()
}

Thank you very much. That appears to work on my sample data. I'll now try on the full real data set. — Keith
– Keith, Commented May 9, 2024 at 17:26

workingdog support Ukraine · Accepted Answer · 2024-05-06 13:51:10Z

The response you get from the server is not an array [Facility]. So trying to decode this gives you an error that you should print, as shown in the example code.

Try this approach using a set of models that match the json data.

Note, don't use try? and print the actual error print("Data not valid \(error)")

struct ServerResponse: Codable {
    let record: [Facility]
    let metadata: Metadata
}

struct Metadata: Codable {
    let id: String
    let metaPrivate: Bool
    let createdAt: String

    enum CodingKeys: String, CodingKey {
        case id
        case metaPrivate = "private"
        case createdAt
    }
}

struct Facility: Codable, Identifiable {
    var id: String
    var facilityName: String
}

struct ContentView: View {
    var body: some View {
        FacilityView()
    }
}

struct FacilityView: View {
    @State private var facilities = [Facility]()
    
    var body: some View {
        NavigationView {
            List(facilities) { item in
                VStack {
                    Text(item.id).font(.headline)
                    Text(item.facilityName)
                }
            }
            .navigationTitle("Facilities")
            .task {
                await fetchData()
            }
        }
    }
    
    func fetchData() async {
        guard let url = URL(string: "https://api.jsonbin.io/v3/b/66130dbead19ca34f85689bc") else {
            print("URL does not work")
            return
        }
        do {
            let (data, _) = try await URLSession.shared.data( from: url)
            let decodedResponse = try JSONDecoder().decode(ServerResponse.self, from: data)
            facilities = decodedResponse.record
        } catch {
            print("Data not valid \(error)") // <--- important
        }
    }
}

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