After applying this recipe, the route "/api/doc" was loaded by default, but it requires two component (`asset` and `twig`) that are usually not require for API only project.
The json route works of the box so it can be provided without additional action.
I faced it and it felt strange, and it seems that others have too : https://github.com/nelmio/NelmioApiDocBundle/issues/1220
In Symfony 4
The `nelmio_api_doc.routes` config option is deprecated. Please use `nelmio_api_doc.areas` instead (just replace `routes` by `areas` in your config)
Piotr AntosikandGitHub
Baptiste LafontaineandBaptiste Lafontaine
Juan Luis García BorregoandGitHub
Guilhem Niot
Fabien Potencier
Michael COULLERET