List all EC2 instance types in a region or AZ

While there appear to be a few ways to output and filter some AWSCLI commands into this list, does someone have a nice+easy way to list all EC2 instance types for a specific region?

Or perhaps that list is published in a .json file up in a bucket someplace, maintained by AWS?

I'm simply looking for this sort of output:

t1.micro
t2.nano
t2.micro
t2.small
...