"application/json" constant in .NET framework

Question

I've just declared a constant for the "application/json" content type in one of my classes.

public const string JsonContentType = "application/json";

I'm not sure it is a good practice.

Does .NET framework have a predefined const for "application/json"?

Answer 1

See Newer Answer. This answer is now inaccurate.

While there are some MIME constants defined in MediaTypeNames (see here), there no constant for "application/json".

Putting additional content types in a shared const is probably best practice, better than defining them in string literals a million times throughout your code at least.

Plus it gives you the flexibility of using new/custom MIME types, which a specific .NET version might not have.

Answer 2

In order to add an up-to-date answer: since dotnet core 2.1 MediaTypeNames.Application.Json has been defined.

See https://github.com/dotnet/corefx/pull/26701 for the changeset.

Answer 3

There is now for Core 2.1, Core 2.2, Core 3.0, Core 3.1, 5, 6...

System.Net.Mime.MediaTypeNames.Application.Json