SDK Connection

An SDK Connection is how you authorize your application to fetch feature flags from GrowthBook. Each connection is scoped to an environment and a language/framework.

Creating an SDK Connection

In the GrowthBook UI, go to Settings in the left sidebar.
Click SDK Connections.
Click Add SDK Connection.
Give it a name (e.g., “Node.js Dev”).
Select the Environment (e.g., development).
Select the Language / Framework (e.g., JavaScript/Node.js).
Click Save. GrowthBook shows you two values:
- apiHost — for self-hosted: http://localhost:3100; for Cloud: https://cdn.growthbook.io.
- clientKey — a string starting with sdk-....
Copy both values. You will use them to initialize the SDK.

import { GrowthBook } from '@growthbook/growthbook';

const gb = new GrowthBook({
  apiHost: 'http://localhost:3100',   // self-hosted SDK API
  clientKey: 'sdk-YOUR_CLIENT_KEY',
});

await gb.init({ timeout: 2000 });

// Check a boolean flag
if (gb.isOn('my-feature')) {
  console.log('Feature is enabled');
}

import { GrowthBook } from '@growthbook/growthbook';

const gb = new GrowthBook({
  apiHost: 'http://localhost:3100',   // self-hosted SDK API
  clientKey: 'sdk-YOUR_CLIENT_KEY',
});

await gb.init({ timeout: 2000 });

// Check a boolean flag
if (gb.isOn('my-feature')) {
  console.log('Feature is enabled');
}