I use tcomb-validation[1] to validate incoming data. The downside is that it cannot use TypeScript types so you have to define the schema twice. For me, the du

I use tcomb-validation[1] to validate incoming data. The downside is that it cannot use TypeScript types so you have to define the schema twice. For me, the duplicated types turned out to be less of a hassle than initially anticipated. In many cases, I ended up with different data structures anyway because the data is transformed in the client. I think of them as transport types and client types. [1]: https://github.com/gcanti/tcomb-validation https://github.com/gcanti/tcomb-validation