> ## Documentation Index
> Fetch the complete documentation index at: https://auth0.com/llms.txt
> Use this file to discover all available pages before exploring further.

# ExperimentMembers

Interface describing the active [Experiment Center](https://auth0.com/docs/customize/experiment-center) experiment assigned to the current screen.

```ts Example theme={null}
export interface ExperimentMembers {
  experimentId: string;
  variationId: string;
  variationName: string | null;
  variationDescription: string | null;
  config: { [key: string]: unknown };
  isControl: boolean;
}
```

## Properties

**config** `Record`

Resolved configuration for the assigned variation. Each key is a config name (for example, `'show_passkey'`) defined by the experiment.

Each entry arrives wrapped as `{ value: <resolved value> }`. Since the wrapper object is always truthy, read the value with `config['<key>']?.value` rather than the entry itself.

The `Experiment` model normalizes an absent or `null` `config` to an empty object (`{}`), so `config` is never `null`.

**experimentId** `string`

Unique identifier of the active experiment.

**isControl** `boolean`

Whether the assigned variation is the control variation.

**variationDescription** `string`

Human-readable description of the assigned variation. `null` for some variations.

**variationId** `string`

Unique identifier of the assigned variation.

**variationName** `string`

Human-readable name of the assigned variation. `null` for some variations.