GrowthBook Open Feature (TypeScript) example

.gitignore

node_modules

.nvmrc

24.0.2

README.md

Assuming

Have GrowthBook running locally via docker-compose

Using stable Node version:

nvm install

Usage

npm install
npm run dev

Example response

  "id": "8a9362ce-6773-45e9-9c7a-6d8df333b7ed"
}
Viewed Experiment: {
  "flagKey": "feature1",
  "defaultValue": false,
  "flagValueType": "boolean",
  "clientMetadata": {
    "providerMetadata": {
      "name": "GrowthbookProvider"
    }
  },
  "providerMetadata": {
    "name": "GrowthbookProvider"
  },
  "context": {
    "id": "8a9362ce-6773-45e9-9c7a-6d8df333b7ed"
  },
  "logger": {},
  "hookData": {
    "data": {}
  }
}
feature is on
Viewed Experiment: {
  "flagKey": "feature1",
  "defaultValue": false,
  "flagValueType": "boolean",
  "clientMetadata": {
    "providerMetadata": {
      "name": "GrowthbookProvider"
    }
  },
  "providerMetadata": {
    "name": "GrowthbookProvider"
  },
  "context": {
    "id": "8a9362ce-6773-45e9-9c7a-6d8df333b7ed"
  },
  "logger": {},
  "hookData": {
    "data": {}
  }
}
feature details: {
  "value": true,
  "reason": "experiment",
  "variant": "1",
  "flagMetadata": {},
  "flagKey": "feature1"
}

gb-api-response.json

{
  "status": 200,
  "features": {
    "feature1": {
      "defaultValue": false,
      "rules": [
        {
          "id": "fr_1j14ku1omjwr8e5i",
          "condition": {
            "id": "force1"
          },
          "force": true
        },
        {
          "id": "fr_1j14ku1omjwrctju",
          "coverage": 1,
          "hashAttribute": "id",
          "seed": "aab6cb2c-5bdb-4081-9bf3-849b69e11025",
          "hashVersion": 2,
          "variations": [
            false,
            true
          ],
          "weights": [
            0.5,
            0.5
          ],
          "key": "myTrackingKey",
          "meta": [
            {
              "key": "0",
              "name": "Control"
            },
            {
              "key": "1",
              "name": "Variation"
            }
          ],
          "phase": "0",
          "name": "Experiemnt"
        }
      ]
    }
  },
  "dateUpdated": "2026-01-02T12:47:29.283Z"
}

main.ts

import { ClientOptions, InitOptions } from '@growthbook/growthbook';
import { GrowthbookProvider } from '@openfeature/growthbook-provider';
import { OpenFeature } from '@openfeature/server-sdk';
import { randomUUID } from 'crypto';

const main = async () => {
  const gbClientOptions: ClientOptions = {
    apiHost: "http://localhost:3100", // Assuming GrwothBook server is running locally
    clientKey: "sdk-iSRObOSTPxzfKVs1", // Value from SDK connection Client Key
  };
  const initOptions: InitOptions = {
    timeout: 1000,
  };
  try {
    await OpenFeature.setProviderAndWait(new GrowthbookProvider(gbClientOptions, initOptions));
  } catch (error) {
    console.error('Failed to initialize provider:', error);
  }

  const client = OpenFeature.getClient();
    const userContext = {
      "id": randomUUID(), // replace with "force1" to view "forced" behavior
  }
  client.setContext(userContext);
  console.log("userContext:", JSON.stringify(userContext, null, 2));

  client.addHooks({
    after: (hookContext) => {
      console.log("Viewed Experiment:", JSON.stringify(hookContext, null, 2));
    }
  })

  const featureName = 'feature1'; // Replace to test not existing feature
  if (await client.getBooleanValue(featureName, false)) {
    console.log("feature is on");
  } else {
    console.log("feature is off");
  }
  const details = await client.getBooleanDetails(featureName, false);
  console.log("feature details:", JSON.stringify(details, null, 2));
}

main();

package-lock.json

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      "name": "growthbook-test-via-open-feature",
      "version": "1.0.0",
      "dependencies": {
        "@growthbook/growthbook": "^1.4.0",
        "@openfeature/core": "^1.9.1",
        "@openfeature/growthbook-provider": "^0.1.2",
        "@openfeature/server-sdk": "^1.20.1"
      },
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package.json

{
  "name": "growthbook-test-via-open-feature",
  "version": "1.0.0",
  "private": true,
  "type": "commonjs",
  "scripts": {
    "dev": "tsx main.ts"
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    "@openfeature/growthbook-provider": "^0.1.2",
    "@openfeature/core": "^1.9.1",
    "@openfeature/server-sdk": "^1.20.1"
  },
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    "tsx": "^4.19.2",
    "typescript": "^5.9.3"
  }
}