Set up JavaScript SDK

Install and initialize the LaunchDarkly JavaScript SDK

Install the package

  yarn add launchdarkly-js-client-sdk

Initialize the SDK

// A "context" is a data object representing users, devices, organizations, and
// other entities. You'll need this later, but you can ignore it for now.
const context = {
  kind: 'user',
  key: 'EXAMPLE_CONTEXT_KEY'
};
const client = createClient('YOUR_CLIENT_SIDE_ID', context);
client.start();

const { status } = await client.waitForInitialization();

if (status === 'complete') {
  console.log('SDK successfully initialized!');
} else {
  console.error('Initialization failed');
}

Finding your SDK credentials

You can find your server-side SDK key, client-side ID, and mobile key in the “Resources” section of the help menu. Click the help icon at the bottom left corner of the LaunchDarkly UI, then choose SDK keys:

The SDK keys option in the help menu.

To learn more, read Initialize the client in the JavaScript SDK reference guide.