> ## Documentation Index
> Fetch the complete documentation index at: https://launchdarkly-preview.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Server-side SDKs

> This category contains documentation topics explaining LaunchDarkly's server-side SDKs.

> For the complete documentation index, see [llms.txt](/llms.txt). For the full documentation snapshot, see [llms-full.txt](/llms-full.txt).

This category contains documentation topics explaining LaunchDarkly's server-side SDKs.

<div>
  <section>
    ### Server-side SDKs

    <div>
      \[<img src="https://files.buildwithfern.com/https://launchdarkly.docs.buildwithfern.com/docs/79f44c483f1d70b11c055f8ce13103203f295fcf51b6c2aeb758c6d01abc40b4/assets/icons/dark/dotnet.svg" alt=".NET logo" class="sdk-logo-dark" />

      <img src="https://files.buildwithfern.com/https://launchdarkly.docs.buildwithfern.com/docs/d573855de861cb58739933d8daa3f848469bdc49fc5fb994dcd889930f35b73e/assets/icons/light/dotnet.svg" alt=".NET logo" class="sdk-logo-light" />

      .NET

      <Icon icon="fa-light fa-arrow-right" />]\(/sdk/server-side/dotnet)

      \[<img src="https://files.buildwithfern.com/https://launchdarkly.docs.buildwithfern.com/docs/e4743669f8a020e0d2cd510e0cd0a2c1f3c1ac972a9f046c05a6dd969b65f2f7/assets/icons/dark/apex.svg" alt="Apex logo" class="sdk-logo-dark" />

      <img src="https://files.buildwithfern.com/https://launchdarkly.docs.buildwithfern.com/docs/234a98070aa9b6eada0788a136c26a46f1d46597641cf3b277fcc10132cc59f9/assets/icons/light/apex.svg" alt="Apex logo" class="sdk-logo-light" />

      Apex

      <Icon icon="fa-light fa-arrow-right" />]\(/sdk/server-side/apex)

      \[<img src="https://files.buildwithfern.com/https://launchdarkly.docs.buildwithfern.com/docs/e50e37b722d7a43d38acf29e213a69afc895476c0d957faafa5ea196e3db85bf/assets/icons/dark/cpp.svg" alt="C++ logo" class="sdk-logo-dark" />

      <img src="https://files.buildwithfern.com/https://launchdarkly.docs.buildwithfern.com/docs/cafe86f9db5526ff1c232085b024ee27824974a2221efc5621e68c2711f5ed80/assets/icons/light/cpp.svg" alt="C++ logo" class="sdk-logo-light" />

      C++

      <Icon icon="fa-light fa-arrow-right" />]\(/sdk/server-side/c-c--)

      \[<img src="https://files.buildwithfern.com/https://launchdarkly.docs.buildwithfern.com/docs/a377421a89a5556372503ee23e8a58816cc5f888f1305e254a00670865519a73/assets/icons/dark/erlang.svg" alt="Erlang logo" class="sdk-logo-dark" />

      <img src="https://files.buildwithfern.com/https://launchdarkly.docs.buildwithfern.com/docs/2c77f1b32a84fda02e927877392349be8100ef8c211d93d992f1104e75b7fcf4/assets/icons/light/erlang.svg" alt="Erlang logo" class="sdk-logo-light" />

      Erlang

      <Icon icon="fa-light fa-arrow-right" />]\(/sdk/server-side/erlang)

      \[<img src="https://files.buildwithfern.com/https://launchdarkly.docs.buildwithfern.com/docs/61d97828914d8aefd9a04275b0a840d77f9d35e0243576931f33c2ff56cdf6e3/assets/icons/dark/go.svg" alt="Go logo" class="sdk-logo-dark" />

      <img src="https://files.buildwithfern.com/https://launchdarkly.docs.buildwithfern.com/docs/bdc61f086f682100caaaf2b75ebae9d708fa82f3fa82aa879b5ad9ad6dec0296/assets/icons/light/go.svg" alt="Go logo" class="sdk-logo-light" />

      Go

      <Icon icon="fa-light fa-arrow-right" />]\(/sdk/server-side/go)

      \[<img src="https://files.buildwithfern.com/https://launchdarkly.docs.buildwithfern.com/docs/e51b70219c3d4ef11c6054b167789ee9baa7713abd46301f8a3bfb8a8c676d0b/assets/icons/dark/haskell.svg" alt="Haskell logo" class="sdk-logo-dark" />

      <img src="https://files.buildwithfern.com/https://launchdarkly.docs.buildwithfern.com/docs/c206fd5ffa594a5365b7066f30548b9c37d13eb1934388e9c1dc1bfb6e80f084/assets/icons/light/haskell.svg" alt="Haskell logo" class="sdk-logo-light" />

      Haskell

      <Icon icon="fa-light fa-arrow-right" />]\(/sdk/server-side/haskell)

      \[<img src="https://files.buildwithfern.com/https://launchdarkly.docs.buildwithfern.com/docs/10a70244fc7ce0ba3d3a34c1d8607b5b7d0b7258b7b52efe2f8c503e53c8b475/assets/icons/dark/java.svg" alt="Java logo" class="sdk-logo-dark" />

      <img src="https://files.buildwithfern.com/https://launchdarkly.docs.buildwithfern.com/docs/82a12e90c06582aa8db0822d56af2a80ed93c4f64ad452a4bf3172b9bcdf82e9/assets/icons/light/java.svg" alt="Java logo" class="sdk-logo-light" />

      Java

      <Icon icon="fa-light fa-arrow-right" />]\(/sdk/server-side/java)

      \[<img src="https://files.buildwithfern.com/https://launchdarkly.docs.buildwithfern.com/docs/fa1f614e3ca44a889b03332926b6c143dbc68756313d701bf7af49b0a3c659ce/assets/icons/dark/lua.svg" alt="Lua logo" class="sdk-logo-dark" />

      <img src="https://files.buildwithfern.com/https://launchdarkly.docs.buildwithfern.com/docs/21a4234aeab4134ecffe4b1342bd06f6585ecc49e65485d46ceb31e2a0cd5828/assets/icons/light/lua.svg" alt="Lua logo" class="sdk-logo-light" />

      Lua

      <Icon icon="fa-light fa-arrow-right" />]\(/sdk/server-side/lua)

      \[<img src="https://files.buildwithfern.com/https://launchdarkly.docs.buildwithfern.com/docs/1f3aa47523e5da050a12172713cd6816a2c99d78368d5b7e40ae2f5f367a2ccb/assets/icons/dark/node.svg" alt="Node.js logo" class="sdk-logo-dark" />

      <img src="https://files.buildwithfern.com/https://launchdarkly.docs.buildwithfern.com/docs/7c5a5862da85d519e99717357af3e9e922fe7fdc4d51bdd446068905a7a38868/assets/icons/light/node.svg" alt="Node.js logo" class="sdk-logo-light" />

      Node.js

      <Icon icon="fa-light fa-arrow-right" />]\(/sdk/server-side/node-js)

      \[<img src="https://files.buildwithfern.com/https://launchdarkly.docs.buildwithfern.com/docs/3fe62bfbac75127d4b85659acdc205c3e7c7a10fab245ceac3cf20e83bc151d0/assets/icons/dark/php.svg" alt="PHP logo" class="sdk-logo-dark" />

      <img src="https://files.buildwithfern.com/https://launchdarkly.docs.buildwithfern.com/docs/607c22da9cdf02e386540a900fa2574bac08be6fc7aa3099c0102f40223cf6b5/assets/icons/light/php.svg" alt="PHP logo" class="sdk-logo-light" />

      PHP

      <Icon icon="fa-light fa-arrow-right" />]\(/sdk/server-side/php)

      \[<img src="https://files.buildwithfern.com/https://launchdarkly.docs.buildwithfern.com/docs/42f294cb0a1f4d7c56de47a258f2c44b89a2b44a0bf4e5db85888123cd1e0705/assets/icons/dark/python.svg" alt="Python logo" class="sdk-logo-dark" />

      <img src="https://files.buildwithfern.com/https://launchdarkly.docs.buildwithfern.com/docs/7d3f53e8aaede35c99164edb18078f0e45b49c24d054f5103cad723e07456896/assets/icons/light/python.svg" alt="Python logo" class="sdk-logo-light" />

      Python

      <Icon icon="fa-light fa-arrow-right" />]\(/sdk/server-side/python)

      \[<img src="https://files.buildwithfern.com/https://launchdarkly.docs.buildwithfern.com/docs/60f734521773beb6832e23320f2a804988f3ce96494454d32444d16b432280d0/assets/icons/dark/ruby.svg" alt="Ruby logo" class="sdk-logo-dark" />

      <img src="https://files.buildwithfern.com/https://launchdarkly.docs.buildwithfern.com/docs/ef5fe9860d318de794fc9d6eaf9c81206bbda0b48081945f2694aa66bca1e085/assets/icons/light/ruby.svg" alt="Ruby logo" class="sdk-logo-light" />

      Ruby

      <Icon icon="fa-light fa-arrow-right" />]\(/sdk/server-side/ruby)

      \[<img src="https://files.buildwithfern.com/https://launchdarkly.docs.buildwithfern.com/docs/11756a497528652c7a817e682e8155f25fe1ce445da217f37c1f4840a313d4d6/assets/icons/dark/rust.svg" alt="Rust logo" class="sdk-logo-dark" />

      <img src="https://files.buildwithfern.com/https://launchdarkly.docs.buildwithfern.com/docs/9d27b71869bba3b2db061999cf272b45a524c7edcf2dd6c504ce79a415257f5f/assets/icons/light/rust.svg" alt="Rust logo" class="sdk-logo-light" />

      Rust

      <Icon icon="fa-light fa-arrow-right" />]\(/sdk/server-side/rust)
    </div>
  </section>
</div>

## Additional resources

\| SDK

\| Sample applications

\| SDK API documentation

\| GitHub repository

| Package manager |
| - |

\| ---

\| ---

\| ---

\| --- |
\| .NET (server-side)

\| [hello-dotnet-server](https://github.com/launchdarkly/hello-dotnet-server){' '}

\| [.NET (server-side) SDK API docs](https://launchdarkly.github.io/dotnet-server-sdk/)

\| [.NET (server-side) SDK](https://github.com/launchdarkly/dotnet-core/tree/main/pkgs/sdk/server)

\| [NuGet](https://www.nuget.org/packages/LaunchDarkly.ServerSdk/) |
\| Apex

\| [hello-apex-server](https://github.com/launchdarkly/hello-apex-server)

\| [Apex SDK API docs](https://github.com/launchdarkly/apex-server-sdk/blob/master/doc.md)

\| [apex-server-sdk](https://github.com/launchdarkly/apex-server-sdk)

\| None |
\| C++ (server-side)

\| [hello-cpp-server](https://github.com/launchdarkly/cpp-sdks/tree/main/examples/hello-cpp-server)

\| [C/C++ (server-side) SDK API docs](https://launchdarkly.github.io/cpp-sdks/libs/server-sdk/docs/html)

\| [cpp-sdks](https://github.com/launchdarkly/cpp-sdks)

\| None |
\| Erlang

\| [hello-erlang](https://github.com/launchdarkly/hello-erlang/) (Erlang) <br /> [hello-elixir](https://github.com/launchdarkly/hello-elixir) (Elixir) <br /> [hello-phoenix](https://github.com/launchdarkly/hello-phoenix) (Phoenix framework)

\| [Erlang SDK API docs](https://hexdocs.pm/launchdarkly_server_sdk/)

\| [erlang-server-sdk](https://github.com/launchdarkly/erlang-server-sdk/)

\| [Hex](https://hex.pm/packages/launchdarkly_server_sdk) |
\| Go

\| [hello-go](https://github.com/launchdarkly/hello-go)

\| \[Go SDK API docs]\([https://pkg.go.dev/gopkg.in/launchdarkly/go-server-sdk.v](https://pkg.go.dev/gopkg.in/launchdarkly/go-server-sdk.v)

5.

\| [go-server-sdk](https://github.com/launchdarkly/go-server-sdk)

\| \[gopkg.in]\([https://pkg.go.dev/gopkg.in/launchdarkly/go-server-sdk.v](https://pkg.go.dev/gopkg.in/launchdarkly/go-server-sdk.v)

5. |
   \| Haskell

\| [hello-haskell-server](https://github.com/launchdarkly/hello-haskell-server)

\| [Haskell SDK API docs](https://launchdarkly.github.io/haskell-server-sdk/)

\| [haskell-server-sdk](https://github.com/launchdarkly/haskell-server-sdk)

\| [Hackage](https://hackage.haskell.org/package/launchdarkly-server-sdk) |
\| Java

\| [hello-java](https://github.com/launchdarkly/hello-java) (Java) <br /> You can also use this SDK with [Kotlin](https://kotlinlang.org/)

\| [Java SDK API docs](https://launchdarkly.github.io/java-core/lib/sdk/server/)

\| [java-server-sdk](https://github.com/launchdarkly/java-core/tree/main/lib/sdk/server)

\| [Maven](https://mvnrepository.com/artifact/com.launchdarkly/launchdarkly-java-server-sdk) |
\| Lua

\| [hello-lua-server](https://github.com/launchdarkly/hello-lua-server) (Lua) <br />{' '} [hello-haproxy](https://github.com/launchdarkly/hello-haproxy) (Lua with HAProxy) <br />{' '} [hello-nginx](https://github.com/launchdarkly/hello-nginx) (Lua with NGINX)

\| [Lua SDK API docs](https://launchdarkly.github.io/lua-server-sdk/modules/launchdarkly-server-sdk.html)

\| [lua-server-sdk](https://github.com/launchdarkly/lua-server-sdk)

\| [LuaRocks](https://luarocks.org/modules/launchdarkly) |
\| Node.js (server-side)

\| [hello-node-server](https://github.com/launchdarkly/hello-node-server) (JavaScript) <br /> [hello-node-typescript](https://github.com/launchdarkly/hello-node-typescript) (TypeScript) <br /> [hello-bootstrap](https://github.com/launchdarkly/hello-bootstrap) (JavaScript, server-side bootstrapping example)

\| [Node.js (server-side) SDK API docs](https://launchdarkly.github.io/js-core/packages/sdk/server-node/docs/)

\| [node-server-sdk](https://github.com/launchdarkly/js-core/tree/main/packages/sdk/server-node)

\| [npm](https://www.npmjs.com/package/@launchdarkly/node-server-sdk) |
\| PHP

\| [hello-php](https://github.com/launchdarkly/hello-php)

\| [PHP SDK API docs](https://launchdarkly.github.io/php-server-sdk/)

\| [php-server-sdk](https://github.com/launchdarkly/php-server-sdk)

\| [Packagist](https://packagist.org/packages/launchdarkly/server-sdk) |
\| Python

\| [hello-python-server](https://github.com/launchdarkly/hello-python) (Python) <br /> [hello-r](https://github.com/launchdarkly/hello-r) (R)

\| [Python SDK API docs](https://launchdarkly-python-sdk.readthedocs.io/)

\| [python-server-sdk](https://github.com/launchdarkly/python-server-sdk)

\| [PyPI](https://pypi.org/project/launchdarkly-server-sdk/) |
\| Ruby

\| [hello-ruby](https://github.com/launchdarkly/hello-ruby) (Ruby)<br /> [hello-bootstrap-rails](https://github.com/launchdarkly/hello-bootstrap-rails) (Rails server-side bootstrapping example)

\| [Ruby SDK API docs](https://launchdarkly.github.io/ruby-server-sdk/)

\| [ruby-server-sdk](https://github.com/launchdarkly/ruby-server-sdk)

\| [RubyGems](https://rubygems.org/gems/launchdarkly-server-sdk) |
\| Rust

\| [hello-rust](https://github.com/launchdarkly/hello-rust)

\| [Rust SDK API docs](https://docs.rs/launchdarkly-server-sdk)

\| [rust-server-sdk](https://github.com/launchdarkly/rust-server-sdk)

\| [crates.io](https://crates.io/crates/launchdarkly-server-sdk) |