reflect-cpp is a C++-20 library for fast serialization, deserialization and validation using reflection, similar to pydantic in Python, serde in Rust, encoding in Go or aeson in Haskell. reflect-cpp fills an important gap in C++ development. It minimizes boilerplate code and enhances code safety for seamless and efficient data exchange across system components. Design principles for reflect-cpp include: - Close integration with containers from the C++ standard library - Close adherence to C++ idioms - Out-of-the-box support for JSON - Simple installation - Simple extendability to other serialization formats - Simple extendability to custom classes - Being one of the fastest serialization libraries in existence, as demonstrated by our benchmarks reflect-cpp is not just a reflection library, it is for serialization, deserialization and validation through reflection.