BasicColourClient.swift

struct Colour: Decodable {
    var id: String
    var name: String
    var hex: String
}

var colours: [Colour] = []

private func loadColours() {
    let url = URL(string: "http://localhost:5000/my-colours")

    URLSession.shared.dataTask(with: url!) { [weak self] (data, response, error) in
        guard error == nil else {
            print("Error getting colours")
            return
        }
        guard let content = data else {
            print("Couldn't get any colours")
            return
        }

        do {
            struct ColourDto: Decodable {
                var colours: [Colour]
            }
            let colourData = try JSONDecoder().decode(ColourDto.self, from: content)
            self?.colours = colourData.colours

            DispatchQueue.main.async {
                self?.tableView?.reloadData()
            }
        } catch let err {
            print("Error decoding json", err)
        }
    }.resume()
}