AWS SES requires template subject despite being marked optional

[acarotin]

Checkboxes for prior research

• I've gone through Developer Guide and API reference
• I've checked AWS Forums and StackOverflow.
• I've searched for previous similar issues and didn't find any solution.

Describe the bug

According to the EmailTemplateContent type definition, the subject field is marked as optional.
However, when creating an AWS SES template without providing a subject, SES returns an error and rejects the request.

Regression Issue

• Select this option if this issue appears to be a regression.

SDK version number

@aws-sdk/client-sesv2@3.946.0

Which JavaScript Runtime is this issue in?

Node.js

Details of the browser/Node.js/ReactNative version

v22.21.1

Reproduction Steps

await client.send(new CreateEmailTemplateCommand({
	TemplateName: 'Name',
	TemplateContent: {
		Text: 'text',
	},
}));

Observed Behavior

AWS SES rejects templates without a subject, returning an error

"errorType": "BadRequestException",
"errorMessage": "The subject must be specified.",

Expected Behavior

Templates should be accepted when the subject field is omitted, as indicated by the optional type definition.

Possible Solution

Either the subject field is truly optional (which I believe it should be), and the API call should succeed without providing one, or the type definition should be updated to mark it as required.

Additional Information/Context

No response

[aBurmeseDev]

Hi @acarotin - thanks for reporting this. I was able to confirm that the subject appears to be required by service API to create the email template and that error is thrown without it. Since service model change has to be done by upstream service team, I need to verify the correct behavior of this part of the model with SES team internally.

Will circle back here when service team responds. (ref V2038667761)