MJExtension

Models don't need to inherit from a base class or modify source files, allowing seamless integration into existing Objective-C codebases without architectural changes, as highlighted in the Nonintrusive Design feature.

Handles complex scenarios like nested models, model arrays, and multi-level key paths with simple API calls, such as using mj_setupObjectClassInArray for array mappings, demonstrated in the examples section.

Provides one-line implementations for NSCoding and NSSecureCoding through macros like MJCodingImplementation, making object serialization straightforward without writing boilerplate code, as shown in the Coding and Secure Coding sections.

Allows custom logic for converting values, such as string dates to NSDate or handling nil values, via methods like mj_newValueFromOldValue, offering fine-grained control over the mapping process, detailed in the NSString -> NSDate example.