
It also means you have a lot of choice in what data you write and what data you don't, and how you design data structures.

Flexible - Optional fields means not only do you get great forwards and backwards compatibility (increasingly important for long-lived games: don't have to update all data with each new version!).It is aimed at projects where spending time and space (many memory allocations) to be able to access or construct serialized data is undesirable, such as in games or any other performance sensitive applications. Access is close to the speed of raw struct access with only one extra indirection (a kind of vtable) to allow for format evolution and optional fields. FlatBuffers is also very suitable for use with mmap (or streaming), requiring only part of the buffer to be in memory. It requires 0 additional allocations (in C++, other languages may vary).


FlatBuffers is an efficient cross platform serialization library for C++, C#, C, Go, Java, Kotlin, JavaScript, Lobster, Lua, TypeScript, PHP, Python, Rust and Swift.
