There are more AWS SDK examples available in the [AWS Doc SDK Examples](https://github.com/awsdocs/aws-doc-sdk-examples) GitHub repo.

# Use `ListCertificates` with an AWS SDK or CLI
<a name="iot_example_iot_ListCertificates_section"></a>

The following code examples show how to use `ListCertificates`.

Action examples are code excerpts from larger programs and must be run in context. You can see this action in context in the following code example: 
+  [Learn the basics](iot_example_iot_Scenario_section.md) 

------
#### [ .NET ]

**SDK for .NET (v4)**  
 There's more on GitHub. Find the complete example and learn how to set up and run in the [AWS Code Examples Repository](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/dotnetv4/IoT#code-examples). 

```
    /// <summary>
    /// Lists all certificates associated with the account.
    /// </summary>
    /// <returns>List of certificate information, or empty list if listing failed.</returns>
    public async Task<List<Certificate>> ListCertificatesAsync()
    {
        try
        {
            var request = new ListCertificatesRequest();
            var response = await _amazonIoT.ListCertificatesAsync(request);

            _logger.LogInformation($"Retrieved {response.Certificates.Count} certificates");
            return response.Certificates;
        }
        catch (Amazon.IoT.Model.ThrottlingException ex)
        {
            _logger.LogWarning($"Request throttled, please try again later: {ex.Message}");
            return new List<Certificate>();
        }
        catch (Exception ex)
        {
            _logger.LogError($"Couldn't list certificates. Here's why: {ex.Message}");
            return new List<Certificate>();
        }
    }
```
+  For API details, see [ListCertificates](https://docs.aws.amazon.com/goto/DotNetSDKV4/iot-2015-05-28/ListCertificates) in *AWS SDK for .NET API Reference*. 

------
#### [ C\$1\$1 ]

**SDK for C\$1\$1**  
 There's more on GitHub. Find the complete example and learn how to set up and run in the [AWS Code Examples Repository](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/cpp/example_code/iot#code-examples). 

```
//! List certificates registered in the AWS account making the call.
/*!
   \param clientConfiguration: AWS client configuration.
  \return bool: Function succeeded.
 */
bool AwsDoc::IoT::listCertificates(
        const Aws::Client::ClientConfiguration &clientConfiguration) {
    Aws::IoT::IoTClient iotClient(clientConfiguration);
    Aws::IoT::Model::ListCertificatesRequest request;

    Aws::Vector<Aws::IoT::Model::Certificate> allCertificates;
    Aws::String marker; // Used to paginate results.
    do {
        if (!marker.empty()) {
            request.SetMarker(marker);
        }

        Aws::IoT::Model::ListCertificatesOutcome outcome = iotClient.ListCertificates(
                request);

        if (outcome.IsSuccess()) {
            const Aws::IoT::Model::ListCertificatesResult &result = outcome.GetResult();
            marker = result.GetNextMarker();
            allCertificates.insert(allCertificates.end(),
                                   result.GetCertificates().begin(),
                                   result.GetCertificates().end());
        }
        else {
            std::cerr << "Error: " << outcome.GetError().GetMessage() << std::endl;
            return false;
        }
    } while (!marker.empty());

    std::cout << allCertificates.size() << " certificate(s) found." << std::endl;

    for (auto &certificate: allCertificates) {
        std::cout << "Certificate ID: " << certificate.GetCertificateId() << std::endl;
        std::cout << "Certificate ARN: " << certificate.GetCertificateArn()
                  << std::endl;
        std::cout << std::endl;
    }

    return true;
}
```
+  For API details, see [ListCertificates](https://docs.aws.amazon.com/goto/SdkForCpp/iot-2015-05-28/ListCertificates) in *AWS SDK for C\$1\$1 API Reference*. 

------
#### [ CLI ]

**AWS CLI**  
**Example 1: To list the certificates registered in your AWS account**  
The following `list-certificates` example lists all certificates registered in your account. If you have more than the default paging limit of 25, you can use the `nextMarker` response value from this command and supply it to the next command to get the next batch of results. Repeat until `nextMarker` returns without a value.  

```
aws iot list-certificates
```
Output:  

```
{
    "certificates": [
        {
            "certificateArn": "arn:aws:iot:us-west-2:123456789012:cert/604c48437a57b7d5fc5d137c5be75011c6ee67c9a6943683a1acb4b1626bac36",
            "certificateId": "604c48437a57b7d5fc5d137c5be75011c6ee67c9a6943683a1acb4b1626bac36",
            "status": "ACTIVE",
            "creationDate": 1556810537.617
        },
        {
            "certificateArn": "arn:aws:iot:us-west-2:123456789012:cert/262a1ac8a7d8aa72f6e96e365480f7313aa9db74b8339ec65d34dc3074e1c31e",
            "certificateId": "262a1ac8a7d8aa72f6e96e365480f7313aa9db74b8339ec65d34dc3074e1c31e",
            "status": "ACTIVE",
            "creationDate": 1546447050.885
        },
        {
            "certificateArn": "arn:aws:iot:us-west-2:123456789012:cert/b193ab7162c0fadca83246d24fa090300a1236fe58137e121b011804d8ac1d6b",
            "certificateId": "b193ab7162c0fadca83246d24fa090300a1236fe58137e121b011804d8ac1d6b",
            "status": "ACTIVE",
            "creationDate": 1546292258.322
        },
        {
            "certificateArn": "arn:aws:iot:us-west-2:123456789012:cert/7aebeea3845d14a44ec80b06b8b78a89f3f8a706974b8b34d18f5adf0741db42",
            "certificateId": "7aebeea3845d14a44ec80b06b8b78a89f3f8a706974b8b34d18f5adf0741db42",
            "status": "ACTIVE",
            "creationDate": 1541457693.453
        },
        {
            "certificateArn": "arn:aws:iot:us-west-2:123456789012:cert/54458aa39ebb3eb39c91ffbbdcc3a6ca1c7c094d1644b889f735a6fc2cd9a7e3",
            "certificateId": "54458aa39ebb3eb39c91ffbbdcc3a6ca1c7c094d1644b889f735a6fc2cd9a7e3",
            "status": "ACTIVE",
            "creationDate": 1541113568.611
        },
        {
            "certificateArn": "arn:aws:iot:us-west-2:123456789012:cert/4f0ba725787aa94d67d2fca420eca022242532e8b3c58e7465c7778b443fd65e",
            "certificateId": "4f0ba725787aa94d67d2fca420eca022242532e8b3c58e7465c7778b443fd65e",
            "status": "ACTIVE",
            "creationDate": 1541022751.983
        }
    ]
}
```
+  For API details, see [ListCertificates](https://awscli.amazonaws.com/v2/documentation/api/latest/reference/iot/list-certificates.html) in *AWS CLI Command Reference*. 

------
#### [ Java ]

**SDK for Java 2.x**  
 There's more on GitHub. Find the complete example and learn how to set up and run in the [AWS Code Examples Repository](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/javav2/example_code/iot#code-examples). 

```
    /**
     * Lists all certificates asynchronously.
     *
     * This method initiates an asynchronous request to list all certificates.
     * If the request is successful, it prints the certificate IDs and ARNs.
     * If an exception occurs, it prints the error message.
     */
    public void listCertificates() {
        CompletableFuture<ListCertificatesResponse> future = getAsyncClient().listCertificates();
        future.whenComplete((response, ex) -> {
            if (response != null) {
                List<Certificate> certList = response.certificates();
                for (Certificate cert : certList) {
                    System.out.println("Cert id: " + cert.certificateId());
                    System.out.println("Cert Arn: " + cert.certificateArn());
                }
            } else {
                Throwable cause = ex != null ? ex.getCause() : null;
                if (cause instanceof IotException) {
                    System.err.println(((IotException) cause).awsErrorDetails().errorMessage());
                } else if (cause != null) {
                    System.err.println("Unexpected error: " + cause.getMessage());
                } else {
                    System.err.println("Failed to list certificates.");
                }
            }
        });

        future.join();
    }
```
+  For API details, see [ListCertificates](https://docs.aws.amazon.com/goto/SdkForJavaV2/iot-2015-05-28/ListCertificates) in *AWS SDK for Java 2.x API Reference*. 

------
#### [ Kotlin ]

**SDK for Kotlin**  
 There's more on GitHub. Find the complete example and learn how to set up and run in the [AWS Code Examples Repository](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/kotlin/services/iot#code-examples). 

```
suspend fun listCertificates() {
    IotClient.fromEnvironment { region = "us-east-1" }.use { iotClient ->
        val response = iotClient.listCertificates()
        val certList = response.certificates
        certList?.forEach { cert ->
            println("Cert id: ${cert.certificateId}")
            println("Cert Arn: ${cert.certificateArn}")
        }
    }
}
```
+  For API details, see [ListCertificates](https://sdk.amazonaws.com/kotlin/api/latest/index.html) in *AWS SDK for Kotlin API reference*. 

------
#### [ Python ]

**SDK for Python (Boto3)**  
 There's more on GitHub. Find the complete example and learn how to set up and run in the [AWS Code Examples Repository](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/python/example_code/iot#code-examples). 

```
class IoTWrapper:
    """Encapsulates AWS IoT actions."""

    def __init__(self, iot_client, iot_data_client=None):
        """
        :param iot_client: A Boto3 AWS IoT client.
        :param iot_data_client: A Boto3 AWS IoT Data Plane client.
        """
        self.iot_client = iot_client
        self.iot_data_client = iot_data_client

    @classmethod
    def from_client(cls):
        iot_client = boto3.client("iot")
        iot_data_client = boto3.client("iot-data")
        return cls(iot_client, iot_data_client)

    def list_certificates(self):
        """
        Lists AWS IoT certificates.

        :return: The list of certificates.
        """
        try:
            certificates = []
            paginator = self.iot_client.get_paginator("list_certificates")
            for page in paginator.paginate():
                certificates.extend(page["certificates"])
            logger.info("Retrieved %s certificates.", len(certificates))
            return certificates
        except ClientError as err:
            if err.response["Error"]["Code"] == "ThrottlingException":
                logger.error("Request throttled. Please try again later.")
            else:
                logger.error(
                    "Couldn't list certificates. Here's why: %s: %s",
                    err.response["Error"]["Code"],
                    err.response["Error"]["Message"],
                )
            raise
```
+  For API details, see [ListCertificates](https://docs.aws.amazon.com/goto/boto3/iot-2015-05-28/ListCertificates) in *AWS SDK for Python (Boto3) API Reference*. 

------