An error occurred (MalformedPolicyDocument) when calling the CreateRole operation: This policy contains invalid Json

[pknomad]

Creating a role using AWS CLI generates the following error:
An error occurred (MalformedPolicyDocument) when calling the CreateRole operation: This policy contains invalid Json

1. Go to AWS Cookbook repo
2. Run ROLE_ARN=$(aws iam create-role --role-name AWSCookbook101Role --assume-role-policy-document assume-role-policy.json --output text --query Role.Arn)

Expected behavior
A clear and concise description of what you expected to happen.

Desktop (please complete the following information):

• macOS 12.4 ARM
• Chrome, Visual Studio Code, iTerm, AWS CLI 2.7.12, Python 3.10.5

JSON is happily accepted when creating the role through the AWS UI. I'm inclined to think I'm fat fingering something or something about AWS CLI doesn't like the formatting somewhere.

[pknomad]

AWS CLI will permit assume-role function on the role created manually on the UI.

[pknomad]

missing file:// right before assume-role-policy.json