Key Encoding and Decoding in Swift

KeyEncodingStrategy.swift

let object = ["keyOne":"Bengal tiger", "keyTwo":"Siberian tiger", "keyThree ":"white rhino", "keyFour":"African elephant"]
let encoder = JSONEncoder()
encoder.keyEncodingStrategy = .convertToSnakeCase
encoder.outputFormatting = [.sortedKeys, .prettyPrinted]
let encoded = try? encoder.encode(object)
print(String(data: encoded!, encoding: .utf8)!)

//output
{
   "key_four" : "African elephant",
   "key_one" : "Bengal tiger",
   "key_three " : "white rhino",
   "key_two" : "Siberian tiger"
}