this post was submitted on 31 Mar 2025
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TypeScript

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Suggest tools for runtime JSON validation? (sh.itjust.works)
submitted 2 weeks ago by [email protected] to c/[email protected]
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I'd like to validate untrusted config JSON submitted to my application against a TypeScript interface. If it's bad, I'd like to serialize a TypeScript object with default values, and suggest it as a pattern.

Last time I looked, TypeScript didn't provide runtime access to types and interfaces, so I'm not clear if that's possible without build-time tomfoolery.

I'd prefer to avoid JSON schemas if I can, but I guess that's an option too.

Are there libraries or new-ish language features that I could use?

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[–] [email protected] 2 points 2 weeks ago* (last edited 2 weeks ago) (1 children)

Try Valibot. It is inspired by Zod.

According to the Valibot FAQ, the main difference with Zod is:

The functionality of Valibot is very similar to Zod. The biggest difference is the modular design of our API and the ability to reduce the bundle size to a minimum through tree shaking and code splitting. Depending on the schema, Valibot can reduce the bundle size up to 95% compared to Zod. Especially for client-side validation of forms and serverless environments this can be a big advantage.

[–] [email protected] 1 points 2 weeks ago

Thanks! I'll take a look.

[–] [email protected] 4 points 2 weeks ago (1 children)

Maybe Zod would fit the bill.