FFI

I wrote about this in a blog post called “User empowerment of FFI in PureScript”

You should read these links at minimum:

• PureScript language FFI documentation https://github.com/purescript/documentation/blob/master/language/FFI.md
• PureScript documentation guide on FFI https://github.com/purescript/documentation/blob/master/guides/FFI.md
• PureScript-Effect uncurried function documentation https://pursuit.purescript.org/packages/purescript-effect/2.0.0/docs/Effect.Uncurried

I have some examples of various ways of doing FFI here: https://github.com/justinwoo/purescript-ffi-intro

“What if I need to validate inputs from FFI?”

Use the Foreign type from the purescript-foreign library and see the next section, which is not only about JSON but also about foreign JS values.