swift-codable

To decode JSON with nested dictionaries and custom date formats in Swift, define a Codable struct using CodingKeys and nested containers, then apply a custom date decoding strategy via JSONDecoder to map the API response accurately.

The best way to remap JSON keys to different Swift property names is to define custom CodingKeys within your Codable struct, enumerating the exact string keys from the JSON payload to map them to your local Swift variables.

You do not need to manually implement init(from:) for every Swift Codable model, because the compiler automatically synthesizes Codable conformance for simple models, requiring manual overrides only for complex mappings or nested containers.

You can use Swift Codable to save and retrieve data from UserDefaults or SwiftData by encoding your models into JSON or plist data with JSONEncoder, then persisting the encoded data locally for later decoding.

Swift Codable handles plist encoding similarly to JSON by using PropertyListEncoder and PropertyListDecoder, allowing the same Codable structs to serialize data into property lists with support for custom date and data strategies.