Just learned about Zod, a #TypeScript schema declaration and validation library. Zod is a simple way to validate API response shapes. Declare a validator once, and Zod infers the type. Zod throws an error when the data doesn’t match the schema. 👍

Yup is similar validation library. But Zod is unique because it throws an error when the data doesn't match the schema. More on Zod vs Yup:

This article is confusing yup is also parsing the object and will throw an error if the schema doesn't match...admittedly I'm biased as the author of yup but the difference between "parsing" vs "validation" seems more like word play

The examples seem to intentionally use the less useful methods from yup to make a distinction between functionality that doesn't exist, picking `isValid` instead of `validate` which is the equivalent to zods `parse`.

no shade to zod, it's great, just dropping by to say that the idea that yup "only validates" is not accurate, yup was built _primarily_ as a tool to do parsing, based on a schema definition.

Thanks for clarifying Jason!

I've been using Zod for a year now and it's proven incredibly useful and very easy to use. And the maintainers are wonderful and responsive!

Didn’t hear about these libraries, but looks very interesting

I've used Joi in the past, albeit with plain JS. That one's quite handy too

Zod I would consider the successor to Joi

Oh shit I’ve been looking for something like this

I can also recommend schemawax. It leans a bit in the direction of Elm style. Non-Matching gives null by default but you can make it throw.

Zod is one of the MVP’s in the default @blitz_js setup

Loving Zod to write our own schema project and use throughout our multiple projects like react native, etc.

Very solid tools to have, especially when tech teams are divided into front end and back end

Wait til you see how it’s used in tRPC.io 👀👀

Exactly, I've been using Zod with trpc and React a lot recently, and it feels great!

It works really well with hook form 🔥

Zod with react hook form is the perfect combination

Love github.com/sinclairzx81/t… for that, because it generates TypeScript types and JSON schema which makes it even more reusable, or allows to pretty an existing schema pretty straightforward.

I noticed @astrodotbuild uses this

Hoe is it different from Joi?

How*

README has a comparison section

Still on the fence between this and runtypes and io-ts. None of which appear to support parser/validator generation from openapi 3 api docs

runtime validation + types is an amazing thing to have in your arsenal. I personally use io-ts by @GiulioCanti, which allows both encoding and decoding, and sharing common "types" (io-ts-types) between apps, like `DateFromISOString` which takes a stringified date and validate it

but Zod is amazing too. Anything that makes our code safer is amazing. Much appreciation to the maintainers 👏

Are zod schemas serializable? At @VulcanJS we historically use SimpleSchema (it was used a lot in @meteorjs) but we have to move away from it in order to be able to store schemas in a database. This is necessary if you want to build a schema-based app generator.

github.com/gristlabs/ts-i… worked well gor me

Fun fact ... whats it called when an API returns the wrong data?

how about