# RequestContext

Learn about the per-request visitor context resolved by the SDK.

This type describes the per-request visitor context the SDK resolves on the server and exposes under the [`croct` property of the load context](/reference/sdk/hydrogen/api/types/croct-context). The [context helper](/reference/sdk/hydrogen/api/setup/create-croct-context) returns it.

## Definition

The type has the following shape:

```ts
type RequestContext = {
  clientId: string,
  userToken: string,
  uri: string,
  clientAgent: string | null,
  referrer: string | null,
  clientIp: string | null,
  preferredLocale: string | null,
  previewToken: string | null,
};
```

## Properties

The following list describes the properties:

- `clientId`: `string`

  The client ID Croct uses to recognize the visitor across requests, in the form of a UUID.

- `userToken`: `string`

  The user token representing the current identity, in the form of a signed JWT.

- `uri`: `string`

  The URL of the current request.

- `clientAgent`: `string|null`

  The user agent of the visitor's browser.

  Is `null` when the request has no `user-agent` header.

- `referrer`: `string|null`

  The referrer URL of the request.

  Is `null` when the request has no `referer` header.

- `clientIp`: `string|null`

  The IP address of the visitor.

  Is `null` when no forwarding header is present.

- `preferredLocale`: `string|null`

  The resolved preferred locale, in [BCP‑47](https://www.rfc-editor.org/info/bcp47) form. For example, `en-US`.

  Is `null` when no locale was resolved.

- `previewToken`: `string|null`

  The active content preview token.

  Is `null` when the visitor is not previewing content.