Since you mentioned typescript first, here's a library that is basically an implementation of the ideas OP tries to convey: https://github.com/gcanti/io-ts http

Since you mentioned typescript first, here's a library that is basically an implementation of the ideas OP tries to convey: https://github.com/gcanti/io-ts https://github.com/gcanti/io-ts Can't recommend using this library enough; being able to essentially reject any input (e.g. json over http) at runtime because it does not conform to the type definition is such an amazing thing!