source.json - LocalStack

{
  "bucket_name": "test-bucket",
  "region": "us-east-1",
  "access_key_id": "test",
  "secret_access_key": "test",
  "endpoint": "http://localhost:4566",
  "file_format": "json",
  "max_threads": 5,
  "retry_count": 3
}