I think we need much better documentation: https://orval.dev/reference/configuration/output#paramsserializeroptions

I have no idea what qs means or what the options for arrayFormat are! Or even any explanaton on what paramsserializeroptions is used for or what problem it solves.

Yes, it seems like this is only supported for axios currently..

@AllieJonsson these docs definitely need improving as I looked at it and it tells me absolutely nothing about this feature, what its for, what the values mean, Axios only etc?

I agree! I can try to both improve the docs and make this work with fetch, its quite a cool feature!
qs is a npm package that stringifies query parameters from an object. E.g.

{
  Foo: {
    Bar: "baz"
  }
}

Could become
?Foo[Bar]=baz

Thanks!

@omarkhatibco @AllieJonsson

fetch client now supports explode of OpenAPI with the following PR:

#1604

This allows you to handle the serializer as defined by OpenAPI in the generator, rather than passing it as an option.
Although the behavior is different from axios, it is preferable to respect the OpenAPI definition.
If you want to customize other than automatic generation by definition, please use customFetch.