Question 1

How do I validate API request data with TypeBox in an Express app?

Accepted Answer

Define a TypeBox schema, compile it with `Schema.Compile()` to create a validator function, then use that function in middleware to parse and validate incoming request bodies against your TypeScript types.

Question 2

TypeBox or Zod for runtime validation in TypeScript?

Accepted Answer

Choose TypeBox if you need strict JSON Schema compliance and interoperability with existing JSON Schema tools. Zod is better for developers preferring a more intuitive, chainable API without JSON Schema constraints.

Question 3

Can TypeBox handle recursive types like tree structures?

Accepted Answer

Yes, TypeBox supports recursive types through its type builders (e.g., using `Type.Recursive`), and the Script function can parse recursive TypeScript interfaces directly into JSON Schema.

Question 4

What's the difference between TypeBox 1.x and 0.x?

Accepted Answer

TypeBox 1.x is ESM-only and built for TypeScript 7.0+ with native JSON Schema 2020-12 support. Version 0.x supports older TypeScript versions and both CJS/ESM, but is maintained separately in a different repository.

Question 5

How to generate JSON Schema from existing TypeScript interfaces automatically?

Accepted Answer

Use the `Type.Script()` function to pass TypeScript definition strings as code, which parses them into JSON Schema objects without manual type builder calls.

Question 6

Does TypeBox work with Cloudflare Workers or edge runtimes?

Accepted Answer

Yes, the Schema compiler includes an automatic fallback to interpreted validation for JIT-restricted environments like Cloudflare Workers, ensuring compatibility.

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