Cap’n Proto is an insanely fast data interchange format and capability-based RPC system. Think JSON, except binary. Or think [Protocol Buffers](https://github.com/protocolbuffers/protobuf), except faster. Cap’n Proto was built by [Kenton Varda](https://github.com/kentonv) to be used in [Sandstorm](https://capnproto.org/faq.html#sandstorm) and is now heavily used in [Cloudflare](https://capnproto.org/faq.html#cloudflare). Start with the [Cap'n Proto Introduction](https://capnproto.org/index.html) for more detailed information on what this is about.
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