messagepack

nlohmann/json

+25

JSON for Modern C++

glaze

+13

Extremely fast, in memory, serialization, reflection, and RPC library for C++. JSON, BEVE, BSON, CBOR, CSV, JSONB, MessagePack, TOML, YAML, EETF

msgspec

+11

A fast serialization and validation library, with builtin support for JSON, MessagePack, YAML, and TOML

MessagePack-CSharp

+5

Extremely Fast MessagePack Serializer for C#(.NET, .NET Core, Unity, Xamarin). / msgpack.org[C#]