ASP.NET: Then vs Now – JSON Serialization Performance

We primarily utilized Newtonsoft back then. JSON.
It wasn’t the fastest, but it was adaptable.

Now in the built-in system, ASP.NET 8. Text.Json is memory and speed optimized.

Afterward, Newtonsoft.JSON

var json = JsonConvert.SerializeObject(myObject);

Now (System.Text.Json)

var json = JsonSerializer.Serialize(myObject);

Benchmarks

50–70% faster than Newtonsoft

Much lower memory allocations

Built-in for all ASP.NET APIs (no extra package)

For most apps, System.Text.Json is the best choice.
Use Newtonsoft.Json only if you need advanced features (e.g., polymorphic serialization).

Pro tip: In .NET 8, System.Text.Json now supports required properties, polymorphism, and contract customization — so even fewer reasons to use Newtonsoft.

ASP.NET 8.0 Hosting Recommendation

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