DescribeEventBus - Amazon EventBridge


Displays details about an event bus in your account. This can include the external AWS accounts that are permitted to write events to your default event bus, and the associated policy. For custom event buses and partner event buses, it displays the name, ARN, policy, state, and creation time.

To enable your account to receive events from other accounts on its default event bus, use PutPermission.

For more information about partner event buses, see CreateEventBus.

Request Syntax

{ "Name": "string" }

Request Parameters

For information about the parameters that are common to all actions, see Common Parameters.

The request accepts the following data in JSON format.


The name or ARN of the event bus to show details for. If you omit this, the default event bus is displayed.

Type: String

Length Constraints: Minimum length of 1. Maximum length of 1600.

Pattern: (arn:aws[\w-]*:events:[a-z]{2}-[a-z]+-[\w-]+:[0-9]{12}:event-bus\/)?[/\.\-_A-Za-z0-9]+

Required: No

Response Syntax

{ "Arn": "string", "Name": "string", "Policy": "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.


The Amazon Resource Name (ARN) of the account permitted to write events to the current account.

Type: String


The name of the event bus. Currently, this is always default.

Type: String


The policy that enables the external account to send events to your account.

Type: String


For information about the errors that are common to all actions, see Common Errors.


This exception occurs due to unexpected causes.

HTTP Status Code: 500


An entity that you specified does not exist.

HTTP Status Code: 400



The following example is run in account 444455556666, which has granted permission to AWS account 111122223333 to send events to 444455556666.

Sample Request

POST / HTTP/1.1 Host: events.<region>.<domain> x-amz-Date: <Date> Authorization: AWS4-HMAC-SHA256 Credential=<Credential>, SignedHeaders=content-type;date;host;user-agent;x-amz-date;x-amz-target;x-amzn-requestid, Signature=<Signature> User-Agent: <UserAgentString> Content-Type: application/x-amz-json-1.1 Content-Length: <PayloadSizeBytes> Connection: Keep-Alive X-Amz-Target: AWSEvents.DescribeEventBus


This example illustrates one usage of DescribeEventBus.

Sample Response

HTTP/1.1 200 OK x-amzn-RequestId: <RequestId> Content-Type: application/x-amz-json-1.1 Content-Length: <PayloadSizeBytes> Date: <Date> { "Policy": { "Version":"2012-10-17", "Statement":[ { "Sid": "mysid", "Effect": "Allow", "Principal":{ "AWS": "arn:aws:iam::111122223333:root" }, "Action":"events:PutEvents", "Resource": "arn:aws:events:us-east-1:444455556666:event-bus/default" } ] }, "Name": "default", "Arn": "arn:aws:events:us-east-1:444455556666:event-bus/default" }

See Also

For more information about using this API in one of the language-specific AWS SDKs, see the following: