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import Foundation

let data: Data // received from a network request, for example
let json = try? JSONSerialization.jsonObject(with: data, options: [])

// Example JSON with object root:
/*
{
"someKey": 42.0,
"anotherKey": {
"someNestedKey": true
}
}
*/
if let dictionary = jsonWithObjectRoot as? [String: Any] {
if let number = dictionary["someKey"] as? Double {
// access individual value in dictionary
}

for (key, value) in dictionary {
// access all key / value pairs in dictionary
}

if let nestedDictionary = dictionary["anotherKey"] as? [String: Any] {
// access nested dictionary values by key
}
}

// Example JSON with array root:
/*
[
"hello", 3, true
]
*/
if let array = jsonWithArrayRoot as? [Any] {
if let firstObject = array.first {
// access individual object in array
}

for object in array {
// access all objects in array
}

for case let string as String in array {
// access only string values in array
}
}

참고

https://developer.apple.com/swift/blog/?id=37