Swift Codable Encode and decode Swift types using ( ) with , , and related APIs. Targets Swift 6.3 / iOS 26+. Contents - Basic Conformance - Custom CodingKeys - Custom Decoding and Encoding - Nested and Flattened Containers - Heterogeneous Arrays - Date Decoding Strategies - Data and Key Strategies - Lossy Array Decoding - Single Value Containers - Default Values for Missing Keys - Encoder and Decoder Configuration - Codable with URLSession - Codable with SwiftData - Codable with UserDefaults - Common Mistakes - Review Checklist - References Basic Conformance When all stored properties are th…