Where's the NuGet package location in ASP.NET Core?

For project.json the nuget directory is in the user profile folder (%UserProfile%\.nuget\packages)

UPDATE

From msdn

The global-packages folder is where NuGet installs any downloaded package. Each package is fully expanded into a subfolder that matches the package identifier and version number. Projects using the PackageReference format always use packages directly from this folder. When using the packages.config, packages are installed to the global-packages folder, then copied into the project's packages folder.

When using PackageReference, the globalPackagesFolder configuration value from nuget.config is used. The default value is:

Windows: %userprofile%\.nuget\packages

Mac/Linux: ~/.nuget/packages

When using packages.config, the repositoryPath configuration value from nuget.config is used. The default value is:

$(Solutiondir)/packages

Both locations (globalPackagesFolder and repositoryPath) can be overridden using the NUGET_PACKAGES environment variable. The environment variable takes precedence over the configuration setting.

According to this documentation you can run this command which will list all Nuget folders on your machine:

dotnet nuget locals all -l

The result will be something like this (folder names self are explanatory):

C:\Users\...>dotnet nuget locals all -l
info : http-cache: C:\Users\...\AppData\Local\NuGet\v3-cache
info : global-packages: C:\Users\...\.nuget\packages\
info : temp: C:\Users\...\AppData\Local\Temp\NuGetScratch
info : plugins-cache: C:\Users\...\AppData\Local\NuGet\plugins-cache