[charlieegan3]

The modules are written in HashiCorp configuration language.

[jfroma]

You are right, I should have say "providers" with new "resources" and yes, this new registry is for modules, not providers.

[lmickh]

You can use json as well, but it is pretty unfriendly for the human users and you lose some of the interpolation.

[meddlepal]

However, very useful if you're code generating Terraform config because there are not a lot of HCL serializer/deserializer libs in existence.