JsonException: A possible object cycle was detected which is not supported. This can either be due to a cycle or if the object depth is larger than

Question

In my web api when i run project for get data from database got this error .net core 3.1

JsonException: A possible object cycle was detected which is not

Answer 1

Ensure you have [JsonIgnore] on the correct fields to avoid a circular reference.

In this case you will need

 public class Product
{
    public int Id { get; set; }
    public string Name { get; set; }
    public string ProductText { get; set; }
    [JsonIgnore]
    public virtual ProductCategory ProductCategory { get; set; }
}

You probably don't need the ProductCategoryId field (depends if you are using EF and code first to define your DB)