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

# Viewed filters

> Send a view event to capture the active filters for items a user viewed.

**Required ACL:** `search`

When users browse a category page,
they see content filtered on that specific category.

To capture the active filters, send a `viewEvent`.

For details where this event is used, see [Event types](/doc/guides/sending-events/concepts/event-types).

## Examples

For more information about initializing the JavaScript Insights client `aa`,
see [Initialize the Insights client](/doc/libraries/search-insights/init).

```js Javascript icon=code theme={"system"}
aa("viewedFilters", {
  userToken: "anonymous-123456", // required for Node.js
  authenticatedUserToken: "user-123456",
  index: "YourIndexName",
  eventName: "Brand Viewed",
  filters: ["brand:apple"],
});
```

## Parameters

<ParamField body="eventName" type="string" required>
  Name of the specific event.

  **Format:** 1-64 ASCII characters, except control characters.

  To maximize the impact of your events,
  use consistent event names and consistent formatting,
  for example, "Product Added To Cart" (always in title case).

  For example, you can adopt Twilio Segment's [object-action framework](https://segment.com/academy/collecting-data/naming-conventions-for-clean-data/#the-object-action-framework).
</ParamField>

<ParamField body="filters" type="string[]" required>
  List of facet filters.

  You can include up to 10 filters.

  **Format:** `${attribute}:${value}`—for example, `brand:apple`.
  Both the `attribute` and `value` in each facet filter must be [URL-encoded](https://developer.mozilla.org/en-US/docs/Glossary/Percent-encoding) individually and separated by a `:`, such as, `"discount:10%25"`.
</ParamField>

<ParamField body="indexName" type="string" required>
  Name of the Algolia index.

  **Format**: same as the index name used by the search engine.

  Some API clients use `index` instead of `indexName`.
</ParamField>

<ParamField body="userToken" type="string" required>
  Anonymous user identifier.

  See also: [User token](/doc/guides/sending-events/concepts/usertoken)
</ParamField>

<ParamField body="authenticatedUserToken" type="string">
  Pseudonymous identifier for authenticated users.

  <Warning>
    Don't include personally identifiable information in user tokens.
  </Warning>

  See also: [User token](/doc/guides/sending-events/concepts/usertoken)
</ParamField>