The JSON format is a widely-used standard for data interchange that enables developers to form the building blocks of platforms and applications that are interoperable across frameworks and tech stacks, including those using Swift. The latest version of Swift, Swift 5, has significantly upgraded the platform and development experience for Apple app developers, providing benefits such as dynamic callable types, raw strings, strict null-correctness, and binary compatibility. JSON is a human-readable format that can be easily represented in most programming languages and frameworks, allowing developers to deserialize data into machine-readable objects. The Swift SDK uses the JSONDecoder type to deserialize JSON documents to Swift objects of a specific type, which conforms to the Codable protocol. Contentful provides APIs for building dynamic web applications with JSON payloads, offering benefits such as lightweight network bandwidth consumption, flexibility in UI creation, and version control of data.