ASP.NET has been around for about 20 years. ASP.NET Core, its sucessor is currently on release 3.0. It brings ASP.NET to all platforms. It's currently clocking in as the fastest backend on market.
Other than Typescript and Github, ASP.NET Core is MSFT's power player for backend. They've spent huge budgets to get where they are now. I don't see it fading any time soon as the only competitor will be Node based servers. But Node may not yet be fully CPU agnostic like C#. That alone is why ASP.NET Core is a great choice.
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