swift-codable

You can map differing JSON keys to Swift properties using custom CodingKeys. By defining an enum conforming to CodingKeys with explicit raw values, you map API payload fields directly to your struct properties during decoding.

Handling deeply nested JSON requires custom init(from:) implementations using nested containers. This approach allows you to drill into nested JSON structures and flatten them into simple Swift data models during decoding.

Decoding heterogeneous arrays requires custom decoding logic using enums with discriminated unions. You parse a specific identifier key to determine the correct concrete type before decoding the rest of the payload.

Yes, Codable integrates directly with URLSession for API integrations. You decode API responses using JSONDecoder and encode request bodies with JSONEncoder, applying specific date and data strategies for compatibility.

Runtime decoding errors usually occur when JSON keys mismatch your Swift properties or types are incompatible. Implementing explicit CodingKeys, robust error handling, and custom decoding strategies prevents these failures.

Yes, Codable works with UserDefaults and plist formats. You can encode Swift data models into plist data and decode them back for local data persistence, using PropertyEncoder and PropertyDecoder.