> ## 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 Node.js (client-side) SDK

> Install and initialize the LaunchDarkly Node.js (client-side) 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.NodeClient} />

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

### Install the package

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

  ```

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

  ```

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

  ```
</CodeGroup>

### Initialize the SDK

```tsx title={"Node.js (client-side) SDK initialization"} theme={null}
import * as LaunchDarkly from 'launchdarkly-node-client-sdk';

// A "context" is a data object representing users, devices, organizations, and other entities.
const context = {
  kind: 'user',
  key: 'EXAMPLE_CONTEXT_KEY',
};

const client = LaunchDarkly.initialize('YOUR_CLIENT_SIDE_ID', context);

try {
  await client.waitForInitialization(5);
  // Initialization succeeded
} catch (err) {
  // Initialization failed or did not complete before timeout
}

```

<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/node-js#initialize-the-client) in the Node.js (client-side) SDK reference guide.