JSON parsing in Swift 4 with complex & nested data

Question

I am currently trying to make a weather app using JSON from https://openweathermap.org but I am having trouble with the weather part in the JSON file. I am not sure how to a

Answer 1

You need to define types for the custom types in your JSON, e.g. weather, clouds, coord, etc. I would recommend looking at the example in the documentation.

In the example, the Landmark type has a 'location' property which is of Coordinate type. You could even use the Coordinate type in the example for the coord property in your JSON object. However, you will need to provide the correct keys using the CodingKey protocol which is also described in the documentation. For example, your Coordinate type may look like this:

struct Coordinate: Codable {
    var latitude: Double
    var longitude: Double

    enum CodingKeys: String, CodingKey {
        case latitude = "lat"
        case longitude = "lon"
    }
}