Set up JavaScript SDK

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// A "context" is a data object representing users, devices, organizations, and
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// other entities. You'll need this later, but you can ignore it for now.
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const context = {
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  kind: 'user',
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  key: 'EXAMPLE_CONTEXT_KEY'
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};
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// This is your client-side ID.
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const client = createClient('YOUR_CLIENT_SIDE_ID', context);
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client.start();
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const { status } = await client.waitForInitialization();
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if (status === 'complete') {
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  console.log('SDK successfully initialized!');
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} else {
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  console.error('Initialization failed');
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}

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import { createClient } from '@launchdarkly/js-client-sdk';
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// A "context" is a data object representing users, devices, organizations, and
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// other entities. You'll need this later, but you can ignore it for now.
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const context = {
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  kind: 'user',
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  key: 'EXAMPLE_CONTEXT_KEY',
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};
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// This is your client-side ID.
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const ldClient = createClient('YOUR_CLIENT_SIDE_ID', context);
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// await start — you only need waitForInitialization() if you wait somewhere
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// other than where you start the client.
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await ldClient.start();
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console.log('SDK successfully initialized!');
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// Call trackMetric when a metric action occurs in your app —
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// a click, a form submit, a page view, a custom event, whatever your metric measures.
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function trackMetric(metricKey, data) {
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  ldClient.track(metricKey, data);
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}