I have trying to get some info from a website and using the following code. I get the data back but it does not decode

struct ResultsView: View {
    @State private var results = [Result]()

    var busId: String = "386"

     let appId = "" // giving app_id
    let appKey = "" // giving app_key

    var body: some View {
        List(results, id: \.lastUpdate) { item in
            VStack(alignment: .leading) {
                Text(item.description)
            }
        }
        .onAppear(perform: loadData)

    }

    func loadData() {
        guard let url = URL(string: "https://api.tfl.gov.uk/Line/\(busId)/Disruption?app_id=\(appId)&app_key=\(appKey)") else {
            print("Invalid URL")
            return
        }

        let request = URLRequest(url: url)

        URLSession.shared.dataTask(with: request) { data, response, error in
            if let data = data {
                if let decodedResponse = try? JSONDecoder().decode(Response.self, from: data) {
                    DispatchQueue.main.async {
                        self.results = decodedResponse.results
                    }
                    return
                }
            }
            print("Fetch failed: \(error?.localizedDescription ?? "Unknown Error")")
        }.resume()
    }
}

Have these structs

struct Response: Codable {
    var results: [Result]
}

struct Result: Codable {
    var lastUpdate: String
    var description: String
}

Any idea what I have done wrong?

It might help if you could post your JSON response so we can see if you have set up your Codable structs properly

Please bear in mind that this is a link to live site and could change

https://api.tfl.gov.uk/Line/246/Disruption

this is what the response looks

[{"$type":"Tfl.Api.Presentation.Entities.Disruption, Tfl.Api.Presentation.Entities","category":"RealTime","type":"lineInfo","categoryDescription":"RealTime","description":"CHANGES TO ROUTE 246: Until further notice, the route will not operate between Westerham and Chartwell due to the closure of Chartwell House. All journeys will operate between Bromley North and Westerham only.","created":"2020-03-23T09:30:00Z","lastUpdate":"2020-03-23T09:32:00Z","affectedRoutes":[],"affectedStops":[]}]

or visit TfL with complete brakdown

https://api.tfl.gov.uk/swagger/ui/index.html?url=/swagger/docs/v1#!/Line/Line_Disruption

@StewartLynch Did that help?