It is actually quite frustrating compared to some other languages, and more often than not you see that its just `JSON.parse` and hope for the best. I wish we had something like Rust's Serde or Haskell's aeson.

If you want to validate data coming over IO then your options are data validation libraries such joi, io-ts, and yup. You have to write seperate data validators on top of your types. io-ts has a way of deriving types from validators, but io-ts is often seen as quite intimidating being built on top of fp-ts.

No matter how carefully you maintain strict typing within your typscript project the moment you hit IO everything is basically `any`.

Some projects like openapi-generator might generate some validators for server respones, but I've not seen any good generators that do actual validation.

I'm not sure if apollo-graphql does responses validation? Does anyone know?