How to turn off or handle camelcasing in json response asp net core

Introduction

ASP.NET is a popular programming language used for building web . One common requirement in web is to handle JSON responses. By default, ASP.NET Core uses camel casing for JSON serialization. However, there may be cases where you want to turn off or customize the camel casing behavior. In this article, we will explore approaches to handle camel casing in JSON responses in ASP.NET Core.

Newtonsoft.Json

One way to handle camel casing in JSON responses is by using the Newtonsoft.Json library. This library provides various options to control the JSON serialization behavior. To turn off camel casing, you can configure the JsonSerializerSettings to use the DefaultContractResolver with CamelCasePropertyNamesContractResolver .


using Newtonsoft.Json;

// Configure JSON serialization settings
JsonSerializerSettings jsonSettings = new JsonSerializerSettings
{
    ContractResolver = new DefaultContractResolver
    {
        NamingStrategy = new DefaultNamingStrategy()
    }
};

// Serialize object to JSON using custom settings
string json = JsonConvert.SerializeObject(obj, jsonSettings);

In the above example, we create a new of JsonSerializerSettings and configure the ContractResolver property to use the DefaultContractResolver with the DefaultNamingStrategy. This will disable camel casing for JSON serialization.

Using System.Text.Json

Starting from ASP.NET Core 3.0, the System.Text.Json namespace provides built-in support for JSON serialization. To handle camel casing in JSON responses using System.Text.Json, you can use the JsonSerializerOptions class and set the PropertyNamingPolicy to null.


using System.Text.Json;

// Configure JSON serialization options
JsonSerializerOptions jsonOptions = new JsonSerializerOptions
{
    PropertyNamingPolicy = null
};

// Serialize object to JSON using custom options
string json = JsonSerializer.Serialize(obj, jsonOptions);

In the above example, we create a new instance of JsonSerializerOptions and set the PropertyNamingPolicy to null. This will disable camel casing for JSON serialization using System.Text.Json.

Customizing Camel Casing

If you want to customize the camel casing behavior, you can a custom strategy. Both Newtonsoft.Json and System.Text.Json allow you to define your own naming strategy by implementing the NamingStrategy or JsonNamingPolicy respectively.


using Newtonsoft.Json.Serialization;

public class CustomNamingStrategy : NamingStrategy
{
    protected override string ResolvePropertyName(string name)
    {
        // Custom camel casing 
        return name.ToLower();
    }
}

// Configure JSON serialization settings with custom naming strategy
JsonSerializerSettings jsonSettings = new JsonSerializerSettings
{
    ContractResolver = new DefaultContractResolver
    {
        NamingStrategy = new CustomNamingStrategy()
    }
};

// Serialize object to JSON using custom settings
string json = JsonConvert.SerializeObject(obj, jsonSettings);

In the above example, we define a CustomNamingStrategy class that inherits from NamingStrategy and overrides the ResolvePropertyName method to implement custom camel casing logic. We then configure the JsonSerializerSettings to use this custom naming strategy for JSON serialization.

Conclusion

camel casing in JSON responses is a common requirement in ASP.NET Core development. By using libraries like Newtonsoft.Json or the built-in System.Text.Json, you can easily turn off or customize the camel casing behavior. Whether you choose to use Newtonsoft.Json or System.Text.Json depends on your specific project requirements and preferences. Experiment with different approaches to find the one that best suits your needs.

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