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OpenFeature SDK

Last updated Jun 30, 2026Copy as MarkdownView as MarkdownAgent setup
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Evaluate Flagship feature flags using OpenFeature.

OpenFeature is the CNCF standard for feature flag interfaces. It provides a vendor-neutral API so you can switch between flag providers without changing evaluation code.

Flagship provides official OpenFeature-compatible SDKs for TypeScript, Python, and Go. The source code is available on GitHub .

SDK Package Runtime Evaluation modes
TypeScript @cloudflare/flagship Workers, Node.js, browsers Workers binding, HTTP, browser prefetch cache
Python cloudflare-flagship Python server applications HTTP
Go github.com/cloudflare/flagship/sdks/go Go server applications HTTP

SDKs

Flagship SDKs are organized by language. The TypeScript SDK has separate setup guides for server-side and browser usage because they use different OpenFeature packages and runtime behavior.

Note

If you are running inside a Cloudflare Worker, the binding is the recommended approach because it avoids HTTP overhead. You can also pass the binding to the OpenFeature SDK to get the best of both. Use the SDK without a binding when running in non-Worker runtimes like Node.js or the browser.

Installation

For TypeScript server-side usage:

npmyarnpnpmbun
npm i @cloudflare/flagship @openfeature/server-sdk

For TypeScript browser usage:

npmyarnpnpmbun
npm i @cloudflare/flagship @openfeature/web-sdk

For Python:

uv add cloudflare-flagship

For Go:

go get github.com/cloudflare/flagship/sdks/go

Next steps

  • Set up the server provider for Workers, Node.js, or other server-side runtimes.
  • Set up the client provider for browser applications.
  • Set up the Python SDK for Python server applications.
  • Set up the Go SDK for Go server applications.
PreviousMethodsNextTypeScript Server SDK

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