> Luckily I found a code that caused this 
> behaviour:
> https://github.com/ansible/ansible/blob/devel/lib/ansible/modules/cloud/docker/docker_login.py#L318.
> The "password" is of type "string". Then I changed "type='str'" to
> "type='json'" in my local file and everything worked!

that's not what "caused" this. The problem is that Ansible interprets
your JSON file as a dictionary, parses it and passes it on as a
dictionary. What you've done is telling the docker_login module to no
longer convert it back to a string, but to keep it as a dictionary.
This will be passed on to the docker daemon as a dictionary (since
docker-py says it wants the password to be a string, but won't check
it). I don't know what the docker daemon will do with it. But this
rather looks like accidental behavior than what is intended.

So your question should be: how do I pass the contents of a JSON file
into the string parameter of a module without Ansible "destroying" it
(by interpreting it as a dictionary)? That's a question better for the
ansible-project google groups / mailing list.

Best regards,
Felix Fontein

> I don't know if I am doing something wrong or it is a real bug and I
> should create an issue on github. Could someone please help me?

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