[Solved] Creation problem with appropriate struct for URL data in JSON format. Source URL in example

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This does not represent the entire data, I left some work for you ?

Please read the JSON carefully, all dictionaries ({}) can be decoded into a struct, all values in double quotes are String, floating point numeric values are Double, the other Int, the Int dates starting with 1523… can be decoded to Date with the appropriate date strategy:

let jsonString = """
{"coord":{"lon":21.01,"lat":52.23},"weather":[{"id":800,"main":"Clear","description":"clear sky","icon":"01d"}],"base":"stations","main":{"temp":294.15,"pressure":1012,"humidity":52,"temp_min":294.15,"temp_max":294.15},"visibility":10000,"wind":{"speed":6.7,"deg":90},"clouds":{"all":0},"dt":1523548800,"sys":{"type":1,"id":5374,"message":0.0023,"country":"PL","sunrise":1523504666,"sunset":1523554192},"id":756135,"name":"Warsaw","cod":200}
"""

struct Root : Decodable {
    let coord : Coordinate
    let weather : [Weather]
    let base : String
    let main : Main
    let dt : Date
}

struct Coordinate : Decodable {
    let lat, lon : Double
}

struct Weather : Decodable {
    let id : Int
    let main, description, icon : String
}

struct Main : Decodable {
    let temp, tempMin, tempMax : Double
    let pressure, humidity : Int
}

let data = Data(jsonString.utf8)
do {
    let decoder = JSONDecoder()
    decoder.keyDecodingStrategy = .convertFromSnakeCase
    decoder.dateDecodingStrategy = .secondsSince1970
    let result = try decoder.decode(Root.self, from: data)
    print(result)
} catch { print(error) }

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solved Creation problem with appropriate struct for URL data in JSON format. Source URL in example