Decoding nested JSON

Question

I am having trouble decoding the following:

struct Categories: Codable {
    var categories: [Category]
}

struct Category: Codable {
    var idCategory: Int
    var strCategory: String
    var strCategoryThumb: String
    var strCategoryDescription: String
}

let url = URL(string: "https://www.themealdb.com/api/json/v1/1/categories.php")!
let session = URLSession.shared

let dataTask = session.dataTask(with: url) { data, response, error in
    if error == nil && data != nil {
        let decoder = JSONDecoder()
        do {
            let allCategories = try decoder.decode(Categories.self, from: data!)
            print(allCategories)
        } catch {
            print("JSON parsing error")
        }
    }
}

dataTask.resume()

For some reason the JSON is not decoded/printed and instead only the "JSON parsing error" is printed. What exactly is it thats going wrong in this case?

Thank you for your time.

Answer 1

you can print the error description to help you figure out what's wrong with your json use:

print(error.localizedDescription)

just after

print("JSON parsing error")

and idCategory should be String instead of Int type

struct Category: Codable {
    var idCategory: String
    var strCategory: String
    var strCategoryThumb: String
    var strCategoryDescription: String
}