👀 Views: 1 💬 Answers: 1 📅 Created: 2025-06-10

c# json system.text.json C#

I'm migrating some code and I'm stuck on something that should probably be simple. I'm working on a project that deserializes a JSON response into a C# object using `System.Text.Json`, but I'm running into `NullReferenceException` when trying to access nested properties. The JSON structure I'm dealing with looks like this: ```json { "user": { "name": "John Doe", "address": { "street": "123 Main St", "city": "Anytown" } } } ``` My C# models are defined as follows: ```csharp public class User { public string Name { get; set; } public Address Address { get; set; } } public class Address { public string Street { get; set; } public string City { get; set; } } ``` I deserialize the JSON response like this: ```csharp var options = new JsonSerializerOptions { PropertyNameCaseInsensitive = true }; var user = JsonSerializer.Deserialize<User>(jsonResponse, options); ``` After deserialization, when I try to access `user.Address.City`, I'm getting a `NullReferenceException`. It seems like the `Address` property is null, but the JSON definitely contains this information. I've checked the JSON and it is properly formatted. To troubleshoot, I tried logging the whole `user` object after deserialization: ```csharp Console.WriteLine(JsonSerializer.Serialize(user)); ``` This output shows that `user.Address` is indeed `null`, but I don't understand why. I've also made sure that the JSON keys match the property names in the C# classes. What could be causing the `Address` property to be null, and how can I fix this issue? I’m using .NET 5.0 and `System.Text.Json` library for deserialization. Any insights would be appreciated! Is there a better approach?