Providers

Flag Controller's feature flag evaluation is powered by flagd, an OpenFeature-compliant evaluation engine. To evaluate flags in your application, choose the OpenFeature Provider that matches your programming language or framework.

Finding a Provider

Browse the OpenFeature ecosystem to find the Provider for your language or framework. OpenFeature Providers are available for many platforms including JavaScript/TypeScript, Java, Go, Python, .NET, and more.

Configuring Your Provider

When configuring your chosen Provider, you will need two things:

1. Base URL or host: The URL of your Flag Controller flagd instance
2. Flag Set ID: A value that scopes flag evaluation to your application and environment

Flag Set ID

The Flag Set ID follows the convention applicationName-environment, where:

• applicationName is your application's name
• environment is either production or development

Example: An application named my-app targeting production uses the Flag Set ID my-app-production.

When using the OFREP endpoint, pass the Flag Set ID as an HTTP header. When using the flagd gRPC protocol, pass it as metadata.

OFREP

import { OFREPProvider } from '@openfeature/ofrep-provider';
import { OpenFeature } from '@openfeature/server-sdk';

await OpenFeature.setProviderAndWait(
  new OFREPProvider({
    baseUrl: 'http://your-flagd-instance:8016',
    headers: [['flagSetId', 'my-app-production']],
  })
);

flagd

import { FlagdProvider } from '@openfeature/flagd-provider';
import { OpenFeature } from '@openfeature/server-sdk';

await OpenFeature.setProviderAndWait(
  new FlagdProvider({
    host: 'your-flagd-instance',
    port: 8013,
    metadata: {
      flagSetId: 'my-app-production',
    },
  })
);

For more information on OpenFeature Providers and their configuration options, see the OpenFeature documentation.