> ## Documentation Index
> Fetch the complete documentation index at: https://docs.flipt.io/llms.txt
> Use this file to discover all available pages before exploring further.

# GRPC SDKs

> An overview of the GRPC server-side SDKs available for integrating with Flipt.

<Info>
  Not sure which SDK to use? Check out our [Integration
  Overview](/v1/integration/overview) documentation.
</Info>

## Overview

For server-side applications, Flipt provides a GRPC API for evaluating flags. The GRPC API SDKs are available in the following languages:

<CardGroup cols={2}>
  <Card href="https://github.com/flipt-io/flipt/tree/main/sdk/go" title="Go" icon="golang" color="#00add8">
    Evaluate flags in your Go applications with GRPC
  </Card>

  <Card href="https://github.com/flipt-io/flipt-grpc-ruby" title="Ruby" icon="gem" color="#cd412b">
    Evaluate flags in your Ruby applications with GRPC
  </Card>

  <Card href="https://github.com/flipt-io/flipt-grpc-dotnet" title="C#" icon="microsoft" color="#4c8abe">
    Evaluate flags in your .NET applications with GRPC
  </Card>

  <Card href="https://github.com/flipt-io/flipt/issues/new" title="Request a Client" icon="github" color="#000000">
    > Need a client in another language? Let us know!
  </Card>
</CardGroup>

If your language isn't listed, please see the section below on how to generate
a native GRPC client manually. If you choose to open-source this client, please
submit a pull request so that we can add it to the docs.

## Generate

If a GRPC client in your language isn't available for download, you can easily
generate it yourself using the existing
[protobuf definition](https://github.com/flipt-io/flipt/blob/main/rpc/flipt/flipt.proto).
The [GRPC documentation](https://grpc.io/docs/) has extensive examples of how to
generate GRPC clients in each supported language.

<Note>
  GRPC generates both client implementation and server interfaces. To use Flipt
  you only need the GRPC client implementation and can ignore the server code as
  this is implemented by Flipt itself.
</Note>

Below are two examples of how to generate Flipt clients in both Go and Ruby.

**Go Example**

1. Follow the [setup instructions](https://grpc.io/docs/quickstart/go/) on the GRPC website.
2. Generate using protoc to desired location:

```console theme={null}
protoc -I ./rpc --go_out=plugins=grpc:/tmp/flipt/go ./rpc/flipt.proto
cd /tmp/flipt/go/flipt
ls
flipt.pb.go          flipt_pb.rb          flipt_services_pb.
```

**Ruby Example**

1. Follow the [setup instructions](https://grpc.io/docs/quickstart/ruby/) on the GRPC website.
2. Generate using protoc to the desired location:

```console theme={null}
grpc_tools_ruby_protoc -I ./rpc --ruby_out=/tmp/flipt/ruby --grpc_out=/tmp/flipt/ruby ./rpc/flipt.proto
cd /tmp/flipt/ruby
ls
flipt_pb.rb          flipt_services_pb.rb
```