Can happen with TypeScript too. There is no runtime type checking so if you pars...

		cryptica on Feb 11, 2019 \| parent \| context \| favorite \| on: 38% of bugs at Airbnb could have been prevented by... Can happen with TypeScript too. There is no runtime type checking so if you parsed a JSON object and cast some unknown property `const result = someRemoteObject.someUnknownPropertyWhichIsAString as number`, it doesn't guarantee that the result is actually a number. You still need to do actual schema validation just like with old school JavaScript.

Better languages solve this. In haskell you define a datatype for json before you parse it.