<ul data-eligibleForWebStory="true">Serialization in JavaScript converts objects/data into easily storable or reconstructible formats, commonly using JSON.Challenges like circular references, non-serializable values, and data integrity led to demand for custom serialization libraries.A custom serialization library handles cases JSON struggles with, offering flexibility and enhanced serialization options.Basic operations of custom serialization include serialize and deserialize methods.Handling circular references and special object types like dates enhances the custom serialization library.Considerations for recursive structures, large binary data, and performance optimizations play roles in advanced serialization cases.Alternative approaches like BSON, msgpack, and protobuf differ in complexity and dependency management.Real-world use cases span gaming engines, web apps, and data streaming applications.Potential pitfalls include security risks with eval and data integrity loss, alleviated through validation and testing.Conclusion emphasizes the benefits of custom serialization for overcoming JSON limitations and tailoring solutions for specific needs.