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Protocol Buffers - Google's data interchange format
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===================================================
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[](https://travis-ci.org/google/protobuf) [](https://ci.appveyor.com/project/protobuf/protobuf) [](https://grpc-testing.appspot.com/job/protobuf_branch) [](https://grpc-testing.appspot.com/job/protobuf_branch_32)
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Copyright 2008 Google Inc.
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https://developers.google.com/protocol-buffers/
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Overview
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--------
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Protocol Buffers (a.k.a., protobuf) are Google's language-neutral,
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platform-neutral, extensible mechanism for serializing structured data. You
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can find [protobuf's documentation on the Google Developers site](https://developers.google.com/protocol-buffers/).
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This README file contains protobuf installation instructions. To install
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protobuf, you need to install the protocol compiler (used to compile .proto
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files) and the protobuf runtime for your chosen programming language.
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Protocol Compiler Installation
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------------------------------
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The protocol compiler is written in C++. If you are using C++, please follow
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the [C++ Installation Instructions](src/README.md) to install protoc along
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with the C++ runtime.
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For non-C++ users, the simplest way to install the protocol compiler is to
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download a pre-built binary from our release page:
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[https://github.com/google/protobuf/releases](https://github.com/google/protobuf/releases)
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In the downloads section of each release, you can find pre-built binaries in
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zip packages: protoc-$VERSION-$PLATFORM.zip. It contains the protoc binary
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as well as a set of standard .proto files distributed along with protobuf.
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If you are looking for an old version that is not available in the release
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page, check out the maven repo here:
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[http://repo1.maven.org/maven2/com/google/protobuf/protoc/](http://repo1.maven.org/maven2/com/google/protobuf/protoc/)
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These pre-built binaries are only provided for released versions. If you want
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to use the github master version at HEAD, or you need to modify protobuf code,
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or you are using C++, it's recommended to build your own protoc binary from
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source.
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If you would like to build protoc binary from source, see the [C++ Installation
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Instructions](src/README.md).
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Protobuf Runtime Installation
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-----------------------------
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Protobuf supports several different programming languages. For each programming
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language, you can find instructions in the corresponding source directory about
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how to install protobuf runtime for that specific language:
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| Language | Source |
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|--------------------------------------|-------------------------------------------------------|
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| C++ (include C++ runtime and protoc) | [src](src) |
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| Java | [java](java) |
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| Python | [python](python) |
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| Objective-C | [objectivec](objectivec) |
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| C# | [csharp](csharp) |
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| JavaNano | [javanano](javanano) |
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| JavaScript | [js](js) |
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| Ruby | [ruby](ruby) |
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| Go | [golang/protobuf](https://github.com/golang/protobuf) |
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| PHP | [php](php) |
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Usage
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-----
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The complete documentation for Protocol Buffers is available via the
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web at:
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https://developers.google.com/protocol-buffers/
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