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This article provides an in-depth exploration of configuring global JSON serialization settings in ASP.NET Core 3. With the framework transitioning from the traditional AddMvc() method to more modular approaches like AddControllers(), developers need to understand how to customize serialization behavior through AddJsonOptions() or AddNewtonsoftJson(). The article compares the configuration methods of System.Text.Json and Json.NET in detail, offering practical code examples and best practices to help developers choose the most suitable configuration strategy based on project requirements.