> ## Documentation Index
> Fetch the complete documentation index at: https://launchdarkly-preview.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Set up JavaScript SDK

> Install and initialize the LaunchDarkly JavaScript SDK

> For the complete documentation index, see [llms.txt](/llms.txt). For the full documentation snapshot, see [llms-full.txt](/llms-full.txt).

<div>
  <ReadmeButton sdk={SDK.JavaScript} />

  <CursorButton sdk={SDK.JavaScript} />
</div>

### Install the package

<CodeGroup>
  ```shell title={"yarn"} theme={null}
    yarn add launchdarkly-js-client-sdk

  ```

  ```shell title={"npm"} theme={null}
    npm i launchdarkly-js-client-sdk

  ```

  ```shell title={"pnpm"} theme={null}
    pnpm i launchdarkly-js-client-sdk

  ```
</CodeGroup>

### Initialize the SDK

```tsx title={"JavaScript SDK initialization"} theme={null}
// 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');
}

```

<Accordion title="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**:

  <Frame caption="The SDK keys option in the help menu.">
    ![The SDK keys option in the help menu.](https://files.buildwithfern.com/https://launchdarkly.docs.buildwithfern.com/docs/28d3e1c568378ea02528db7ba62bfbd742f6f1cad964b5675395e10af5eeeb60/assets/images/auto/help-menu-sdk-keys.auto.png)
  </Frame>
</Accordion>

To learn more, read [Initialize the client](/sdk/client-side/javascript#initialize-the-client) in the JavaScript SDK reference guide.