is it possible to use Identity EF Core as login/signup on a REST API using nextjs?

I was wondering is it possible to use Identity Framework from dotnet core as a authentication and authorization for a rest API app.

So I was thinking a Landing page using nextjs then a button for login that redirects you on a dotnet razor pages for you to login or get authenticated and then, redirects you again to nextjs with something like JWT as a payload?

I'm asking this question because I'm not sure where to get this flow for documentation or any examples that I could read.

Yes,since .net 8 Identity provides APIs that handle authentication, authorization, and identity management. you could follow the steps in the document

If you use AppUser class driven from IdentityUser

public class AppUser : IdentityUser
{
  .......
}

register related services as below:

var connectionString = builder.Configuration.GetConnectionString("AppDbContextConnection") ?? throw new InvalidOperationException("Connection string 'IdentityForApiContextConnection' not found.");

builder.Services.AddDbContext<AppDbContext>(options => options.UseSqlServer(connectionString));

builder.Services.AddIdentityApiEndpoints<AppUser>()
    .AddSignInManager<SignInManager<AppUser>>()
    .AddEntityFrameworkStores<AppDbContext>();

a Landing page using nextjs then a button for login that redirects you on a dotnet razor pages for you to login or get authenticated and then, redirects you again to nextjs with something like JWT as a payload

After you've register ab account,send a request to /login endpoint as below:

You would get token in response directly: