Parsing JSON in Swift: The Complete Guide [With Examples]

Parsing JSON data is fundamental to any iOS app that performs remote REST API calls.

Thanks to the Codable protocols introduced in Swift 4, Swift has a native and idiomatic way to parse JSON data.

Paired with the JSONDecoder class, the Decodable protocol allows straightforward JSON decoding in a few lines of code and more sophisticated techniques to handle all the possible data formats and edge cases.

Parse JSON in Swift without Codable [Arrays and Dictionaries]

Since Swift 4, the recommended way to parse JSON data is to use the Codable protocols with the JSONEncoder and JSONDecoder classes.

However, this method requires creating Swift model types that match the JSON data structure you need to decode.

Sometimes, you might want to avoid creating extra Swift types if you only need to read some of the information in the JSON data locally.