# ListTypes
The `ListTypes` operation returns a list of types for a specified keyspace.
To read keyspace metadata using `ListTypes`, the IAM principal needs `Select` action permissions for the system keyspace. To configure the required permissions, see [Permissions to view a UDT](https://docs.aws.amazon.com/keyspaces/latest/devguide/configure-udt-permissions.html#udt-permissions-view) in the *Amazon Keyspaces Developer Guide*.
## Request Syntax
```
{
"keyspaceName": "string",
"maxResults": number,
"nextToken": "string"
}
```
## Request Parameters
For information about the parameters that are common to all actions, see [Common Parameters](CommonParameters.md).
The request accepts the following data in JSON format.
** [keyspaceName](#API_ListTypes_RequestSyntax) **
The name of the keyspace that contains the listed types.
Type: String
Length Constraints: Minimum length of 1. Maximum length of 48.
Pattern: `[a-zA-Z0-9][a-zA-Z0-9_]{0,47}`
Required: Yes
** [maxResults](#API_ListTypes_RequestSyntax) **
The total number of types to return in the output. If the total number of types available is more than the value specified, a `NextToken` is provided in the output. To resume pagination, provide the `NextToken` value as an argument of a subsequent API invocation.
Type: Integer
Valid Range: Minimum value of 1. Maximum value of 1000.
Required: No
** [nextToken](#API_ListTypes_RequestSyntax) **
The pagination token. To resume pagination, provide the `NextToken` value as an argument of a subsequent API invocation.
Type: String
Length Constraints: Minimum length of 1. Maximum length of 2048.
Required: No
## Response Syntax
```
{
"nextToken": "string",
"types": [ "string" ]
}
```
## Response Elements
If the action is successful, the service sends back an HTTP 200 response.
The following data is returned in JSON format by the service.
** [nextToken](#API_ListTypes_ResponseSyntax) **
The pagination token. To resume pagination, provide the `NextToken` value as an argument of a subsequent API invocation.
Type: String
Length Constraints: Minimum length of 1. Maximum length of 2048.
** [types](#API_ListTypes_ResponseSyntax) **
The list of types contained in the specified keyspace.
Type: Array of strings
Length Constraints: Minimum length of 1. Maximum length of 48.
## Errors
For information about the errors that are common to all actions, see [Common Error Types](CommonErrors.md).
[AccessDeniedException](API_AccessDeniedException.md)
You don't have sufficient access permissions to perform this action.
** message **
You don't have the required permissions to perform this operation. Verify your IAM permissions and try again.
HTTP Status Code: 400
[InternalServerException](API_InternalServerException.md)
Amazon Keyspaces was unable to fully process this request because of an internal server error.
** message **
An internal service error occurred. Retry your request. If the problem persists, contact AWS Support.
HTTP Status Code: 500
[ResourceNotFoundException](API_ResourceNotFoundException.md)
The operation tried to access a keyspace, table, or type that doesn't exist. The resource might not be specified correctly, or its status might not be `ACTIVE`.
** message **
The specified resource was not found. Verify the resource identifier and ensure the resource exists and is in an ACTIVE state.
** resourceArn **
The unique identifier in the format of Amazon Resource Name (ARN) for the resource couldn't be found.
HTTP Status Code: 400
[ServiceQuotaExceededException](API_ServiceQuotaExceededException.md)
The operation exceeded the service quota for this resource. For more information on service quotas, see [Quotas](https://docs.aws.amazon.com/keyspaces/latest/devguide/quotas.html) in the *Amazon Keyspaces Developer Guide*.
** message **
The requested operation would exceed the service quota for this resource. Review the service quotas and adjust your request accordingly.
HTTP Status Code: 400
[ValidationException](API_ValidationException.md)
The operation failed due to an invalid or malformed request.
** message **
The request parameters are invalid or malformed. Review the API documentation and correct the request format.
HTTP Status Code: 400
## See Also
For more information about using this API in one of the language-specific AWS SDKs, see the following:
+ [AWS Command Line Interface V2](https://docs.aws.amazon.com/goto/cli2/keyspaces-2022-02-10/ListTypes)
+ [AWS SDK for .NET V4](https://docs.aws.amazon.com/goto/DotNetSDKV4/keyspaces-2022-02-10/ListTypes)
+ [AWS SDK for C\$1\$1](https://docs.aws.amazon.com/goto/SdkForCpp/keyspaces-2022-02-10/ListTypes)
+ [AWS SDK for Go v2](https://docs.aws.amazon.com/goto/SdkForGoV2/keyspaces-2022-02-10/ListTypes)
+ [AWS SDK for Java V2](https://docs.aws.amazon.com/goto/SdkForJavaV2/keyspaces-2022-02-10/ListTypes)
+ [AWS SDK for JavaScript V3](https://docs.aws.amazon.com/goto/SdkForJavaScriptV3/keyspaces-2022-02-10/ListTypes)
+ [AWS SDK for Kotlin](https://docs.aws.amazon.com/goto/SdkForKotlin/keyspaces-2022-02-10/ListTypes)
+ [AWS SDK for PHP V3](https://docs.aws.amazon.com/goto/SdkForPHPV3/keyspaces-2022-02-10/ListTypes)
+ [AWS SDK for Python](https://docs.aws.amazon.com/goto/boto3/keyspaces-2022-02-10/ListTypes)
+ [AWS SDK for Ruby V3](https://docs.aws.amazon.com/goto/SdkForRubyV3/keyspaces-2022-02-10/ListTypes)