> For the complete documentation index, see [llms.txt](https://developer.harness.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://developer.harness.io/feature-flags/use-feature-flags/use-ff/ff-sdks/server-sdks.md).

# Server SDK Guides

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[Apex SDK Reference](/feature-flags/use-feature-flags/use-ff/ff-sdks/server-sdks/apex-sdk-reference.md)
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[Erlang SDK Reference](/feature-flags/use-feature-flags/use-ff/ff-sdks/server-sdks/erlang-sdk-reference.md)
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[Go SDK Reference](/feature-flags/use-feature-flags/use-ff/ff-sdks/server-sdks/feature-flag-sdks-go-application.md)
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[Java SDK Reference](/feature-flags/use-feature-flags/use-ff/ff-sdks/server-sdks/integrate-feature-flag-with-java-sdk.md)
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[.NET SDK Reference](/feature-flags/use-feature-flags/use-ff/ff-sdks/server-sdks/net-sdk-reference.md)
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[Node.js SDK Reference](/feature-flags/use-feature-flags/use-ff/ff-sdks/server-sdks/node-js-sdk-reference.md)
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[PHP SDK Reference](/feature-flags/use-feature-flags/use-ff/ff-sdks/server-sdks/php-sdk-reference.md)
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[Python SDK Reference](/feature-flags/use-feature-flags/use-ff/ff-sdks/server-sdks/python-sdk-reference.md)
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[Ruby SDK Reference](/feature-flags/use-feature-flags/use-ff/ff-sdks/server-sdks/ruby-sdk-reference.md)
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