Difference between Transformer and Mutator

[Hypenate]

Our backend is producing snake case but I want to transform (or mutate?) all the classes and properties to camel case.
I want to remove the _ and make some characters upercase etc.

But where do I do this? And how can I change the propertie names?
I also saw that there is a transformer under output but also under input?

I'm a bit confused atm 🤔

[Hypenate]

It seems the mutator is able to change the actualy request/response to the API
Where as the transformer is able to transform the generation of the yaml file.

[anymaniax]

@Hypenate Hi, You are right the transform are at generation time and mutators are used at run time