tl;dr

TypeScript is already a great upgrade from JavaScript if you like types and want to ensure type-safety in your code base. Zod aids that goal by making sure that incoming data satisfies the purpose it is about to fulfill, among other features of course.

Zod is a TypeScript-first schema declaration and validation library with lots of features that I have yet to use. However, the basics are very handy and simple to get started with! For the purpose of introducing Zod, we’ll assume that we have a Node.js backend with an endpoint for adding a user to our system.