Anand Nimje 1. Refresh the page, check Medium ’s site status, or find something interesting to read. However, all these tutorials do not cover one specific type of JSON structure - JSON with dynamic keys. Handle JSON Response with the Codable by Anand Nimje Better Programming 500 Apologies, but something went wrong on our end. This books array will contain a list of book instances that are generated as we. There are tons of tutorials out there that teach you how to utilize the Decodable protocol to decode various types of JSON structure. Finally, the parse() method is called to begin parsing the XML document. Since then it has become the standard way for developers to decode JSON received from a remote server. Let task = (with: url) ).ĬodingKey protocol defines how properties of a struct / object are linked to its encoded form (eg: JSON).The Decodable protocol was introduced in Swift 4. We can then parse this JSON into Car struct like this: let url = URL(string: '')! Notice the struct conforms to the Decodable protocol, so that JSON can be converted into this struct instance. Because JSON.parse() function will round the numbers. Lets start with a simple Car struct like this : struct Car: Decodable Enable Big Number switch if JSON has Big Number to retain numbers after formatting. Parse JSON key into different property name.Parse JSON into array of structs / objects.

In this post we will look into how to use the Decodable protocol to parse JSON into Object / Struct, parse struct / object into JSON and various scenario of parsing. Let car = try? JSONDecoder().decode(Car.self, from: jsonData)Ĭodable protocol is a combination of Encodable + Decodable, an object / struct conforming to Codable protocol can be converted from and to JSON. Let encodedJSONData = try? JSONEncoder().encode(car)Īn object / struct that conforms to Decodable protocol can be converted from JSON, like this :

Bless Apple for introducing the Decodable, Encodable, Codable protocol in Swift 4, it makes life as an iOS developer easier phew.Īn object / struct that conforms to Encodable protocol can be converted to JSON, like this :

Swift parse json array