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

# (Beta) Retrieve the field catalog

> Beta: this endpoint is under active development and may change without notice.

Returns the static catalog of analytics fields, grouped by domain and usage (metrics, filters,
groups, distributions). No authentication is required. Use it to discover valid `(domain, kind)`
pairs before building the other `/3/patterns/*` queries; two fields are combinable in one query
only when their `roots` intersect. Each entry's `requires` lists the ACLs needed when that field
is actually used in a query.

## Usage

<CodeGroup>
  ```cs C# theme={"system"}
  // Initialize the client
  var client = new AnalyticsClient(
    new AnalyticsConfig("ALGOLIA_APPLICATION_ID", "ALGOLIA_API_KEY", "ALGOLIA_APPLICATION_REGION")
  );

  // Call the API
  var response = await client.GetPatternsFieldsAsync();

  // print the response
  Console.WriteLine(response);
  ```

  ```go Go theme={"system"}
  // Initialize the client with your application region, eg. analytics.ALGOLIA_APPLICATION_REGION
  client, err := analytics.NewClient("ALGOLIA_APPLICATION_ID", "ALGOLIA_API_KEY", analytics.US)
  if err != nil {
    // The client can fail to initialize if you pass an invalid parameter.
    panic(err)
  }

  // Call the API
  response, err := client.GetPatternsFields()
  if err != nil {
    // handle the eventual error
    panic(err)
  }


  // print the response
  print(response)
  ```

  ```java Java theme={"system"}
  // Initialize the client
  AnalyticsClient client = new AnalyticsClient("ALGOLIA_APPLICATION_ID", "ALGOLIA_API_KEY", "ALGOLIA_APPLICATION_REGION");

  // Call the API
  Catalog response = client.getPatternsFields();

  // print the response
  System.out.println(response);
  ```

  ```js JavaScript theme={"system"}
  // Initialize the client
  // Replace 'us' with your Algolia Application Region
  const client = algoliasearch('ALGOLIA_APPLICATION_ID', 'ALGOLIA_API_KEY').initAnalytics({ region: 'us' });

  // Call the API
  const response = await client.getPatternsFields();


  // print the response
  console.log(response);
  ```

  ```kotlin Kotlin theme={"system"}
  // Initialize the client
  val client =
    AnalyticsClient(
      appId = "ALGOLIA_APPLICATION_ID",
      apiKey = "ALGOLIA_API_KEY",
      region = "ALGOLIA_APPLICATION_REGION",
    )

  // Call the API
  var response = client.getPatternsFields()


  // print the response
  println(response)
  ```

  ```php PHP theme={"system"}
  // Initialize the client
  $client = AnalyticsClient::create('ALGOLIA_APPLICATION_ID', 'ALGOLIA_API_KEY', 'ALGOLIA_APPLICATION_REGION');

  // Call the API
  $response = $client->getPatternsFields();


  // print the response
  var_dump($response);
  ```

  ```python Python theme={"system"}
  # Initialize the client
  # In an asynchronous context, you can use AnalyticsClient instead, which exposes the exact same methods.
  client = AnalyticsClientSync(
      "ALGOLIA_APPLICATION_ID", "ALGOLIA_API_KEY", "ALGOLIA_APPLICATION_REGION"
  )

  # Call the API
  response = client.get_patterns_fields()


  # print the response
  print(response)
  ```

  ```ruby Ruby theme={"system"}
  # Initialize the client
  client = Algolia::AnalyticsClient.create("ALGOLIA_APPLICATION_ID", "ALGOLIA_API_KEY", "ALGOLIA_APPLICATION_REGION")

  # Call the API
  response = client.get_patterns_fields


  # print the response
  puts(response)
  ```

  ```scala Scala theme={"system"}
  // Initialize the client
  val client = AnalyticsClient(
    appId = "ALGOLIA_APPLICATION_ID",
    apiKey = "ALGOLIA_API_KEY",
    region = Option("ALGOLIA_APPLICATION_REGION")
  )

  // Call the API
  val response = Await.result(
    client.getPatternsFields(
    ),
    Duration(100, "sec")
  )

  // print the response
  println(response)
  ```

  ```swift Swift theme={"system"}
  // Initialize the client
  let client = try AnalyticsClient(appID: "ALGOLIA_APPLICATION_ID", apiKey: "ALGOLIA_API_KEY", region: .us)

  // Call the API
  let response = try await client.getPatternsFields()

  // print the response
  print(response)
  ```
</CodeGroup>

<Card icon="folder-code" horizontal="true" title="See the full API reference" arrow="true" href="/doc/rest-api/analytics/get-patterns-fields">
  For more details about input parameters
  and response fields.
</Card>