Key Encoding in Swift

PrettyPrint.swift

let object = ["key1":"bengal tiger", "key2":"siberian tiger", "key3":"white rhino", "key4":"african elephant"]
let encoder = JSONEncoder()
encoder.outputFormatting= .prettyPrinted
let encoded = try? encoder.encode(object)
print(String(data: encoded!, encoding: .utf8)!)

//output
{
   "key3" : "white rhino",
   "key1" : "bengal tiger",
   "key4" : "african elephant",
   "key2" : "siberian tiger"
}