Can I ask what you ran into? I'm thinking about starting a side project with .Net Core for my API and React for my front end. I'm wondering if it's even worth it to use Core at this point or switch to Go or Node.
I personally hate node with all of my being, but Go is good stuff and Java has two very solid REST frameworks Jersey and Spring Boot. Depending on the project needs you could use DropWizard or Play which come with a really solid REST API framework builtin.
I was always partial to Pythons Flask as well
What did we run into? Tons of brokenness. Inability to use C# libs was the biggest problem, if you're trying to make anything significant you're going to have to roll your own everything. Java is the safest bet for large projects, I've never run into any issues finding a quality library to do anything. This is coming from a guy that's been a career C# dev for years and wishes he could defect to Java.
I have no clue if anyone really uses it, and it has a terribly un-googleable name, but the Java Spark Framework is the most beautifully simplistic REST API I have ever played with. It's the only time Java has ever felt like Node to me.
