Is there an existing issue for this?

• I have searched the existing issues

Current Behavior

I am running an SNS topic that publishes to a lambda function. The localstack code reads a type byte object from the lambda function invocation payload here and then tries to dump the result into json here which results in the following error:

sns_pub_0] l.services.sns.publisher   : Unable to run Lambda function on SNS message: Object of type bytes is not JSON serializable

Expected Behavior

The payload bytes should be converted to a string before being dumped to json. The error should not be thrown.

How are you starting LocalStack?

With a docker-compose file

Steps To Reproduce

How are you starting localstack (e.g., bin/localstack command, arguments, or docker-compose.yml)

docker-compose up
(Using the standard docker-compose.yaml)

Client commands (e.g., AWS SDK code snippet, or sequence of "awslocal" commands)

awslocal sns publish --message file://sns/message.json --topic-arn arn:aws:sns:us-east-1:000000000000:<topic_name>

Environment

- OS: macOS Ventura 13.2.1
- LocalStack: latest

Anything else?

No response