Swift Codable

This gives you everything you need to parse JSON in Swift without fighting the type system. It covers the basics like auto-synthesized conformance and CodingKeys for snake_case remapping, but the real value is in the advanced patterns: flattening nested JSON with nestedContainer, decoding heterogeneous arrays with discriminators, lossy decoding that skips bad elements instead of failing the whole array, and practical integration with URLSession and SwiftData. The date and key strategy examples alone will save you from reinventing that logic. If you're doing anything beyond trivial JSON parsing in a Swift app, you'll reference this.