Question 1

What is the difference between TypeScript interfaces and Zod schemas?

Accepted Answer

Interfaces exist only at compile time and are erased in JavaScript. Zod schemas are runtime validators — they check actual data at execution, making them ideal for API response validation.

Question 2

How does it handle optional and nullable fields?

Accepted Answer

Fields present in some array elements but not others are marked optional (?). Fields that appear as null generate nullable union types (string | null).

JSON to TypeScript