[ACCEPTED]-Avoid or control circular references in Entity Framework Core-entity-framework-core
Assuming you are using the latest and greatest 12 ASP .NET Core 3.1 with System.Text.Json, to handle reference 11 loops you will need to switch "back" to 10 Newtonsoft.Json (though it worth mentioning that System.Text.Json should 9 be faster. Also support for reference loops 8 handling is coming, as @Eric J. wrote in comments):
services.AddControllers()
.AddNewtonsoftJson(x => x.SerializerSettings.ReferenceLoopHandling = Newtonsoft.Json.ReferenceLoopHandling.Ignore)
As 7 for EF creating reference loops - it is 6 called relationship fixup and you can't do a lot about it 5 (see this answer). AsNoTracking can help a little bit (but 4 not in case of Include). My personal approach is 3 to return DTO's from endpoints and not entites 2 directly.
UPD
In .NET 5.0 ReferenceHandler is introduced, so 1 next should do the trick:
services.AddControllersWithViews()
.AddJsonOptions(options =>
options.JsonSerializerOptions.ReferenceHandler = ReferenceHandler.Preserve)
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