Set up JavaScript SDK | LaunchDarkly

Install the package

$ yarn add @launchdarkly/js-client-sdk

Initialize the SDK

JavaScript SDK initialization

1 // A "context" is a data object representing users, devices, organizations, and
2 // other entities. You'll need this later, but you can ignore it for now.
3 const context = {
4   kind: 'user',
5   key: 'EXAMPLE_CONTEXT_KEY'
6 };
7 // This is your client-side ID.
8 const client = createClient('YOUR_CLIENT_SIDE_ID', context);
9 client.start();
10 
11 const { status } = await client.waitForInitialization();
12 
13 if (status === 'complete') {
14   console.log('SDK successfully initialized!');
15 } else {
16   console.error('Initialization failed');
17 }

Finding your SDK credentials

You can find your server-side SDK keys, mobile keys, and client-side ID on the SDK keys page under Settings.

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

$ yarn add @launchdarkly/js-client-sdk

JavaScript SDK initialization

1 // A "context" is a data object representing users, devices, organizations, and
2 // other entities. You'll need this later, but you can ignore it for now.
3 const context = {
4   kind: 'user',
5   key: 'EXAMPLE_CONTEXT_KEY'
6 };
7 // This is your client-side ID.
8 const client = createClient('YOUR_CLIENT_SIDE_ID', context);
9 client.start();
10 
11 const { status } = await client.waitForInitialization();
12 
13 if (status === 'complete') {
14   console.log('SDK successfully initialized!');
15 } else {
16   console.error('Initialization failed');
17 }

1	// A "context" is a data object representing users, devices, organizations, and
2	// other entities. You'll need this later, but you can ignore it for now.
3	const context = {
4	kind: 'user',
5	key: 'EXAMPLE_CONTEXT_KEY'
6	};
7	// This is your client-side ID.
8	const client = createClient('YOUR_CLIENT_SIDE_ID', context);
9	client.start();
10
11	const { status } = await client.waitForInitialization();
12
13	if (status === 'complete') {
14	console.log('SDK successfully initialized!');
15	} else {
16	console.error('Initialization failed');
17	}