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Were you able to solve this?

If not - what do you see if you run: `aws cloudformation get-template --stack-name stack-name`?  Pulumi should be parsing the JSON/YAML that is returned from that call. 

Yes I am able to run get-template cli call and it returned me JSON which I checked with online json validator that it's a valid json

And you are sure it’s in the same account and region?  

This is definitely not expected - so if you can share a repro in an issue report we can look into it more. 

Yes, it's same account and region. I tried running aws cli get-template command, it worked and ran pulumi aws.cloudformation.get_stack(name = 'stack-name'), it failed.

I will create issue on Github, that's what you are saying?

Yes - that would be great - <https://github.com/pulumi/pulumi-aws/issues>

Created an issue: <https://github.com/pulumi/pulumi-aws/issues/768>

I am new to pulumi so I have a question: how do I migrate all my cloudformation resources to pulumi? Migration is big efforts as we have 5000+ stacks.