Zod•8mo ago

Alex - Hi there, I am trying to validate a numb...

Hi there, I am trying to validate a number using zod. The number is first received as a string and could possibly be anything because it comes from a user input.

z.coerce.number().int("Invalid Value").positive("Must be a positive number").safeParse(maxQuantity);

z.coerce.number().int("Invalid Value").positive("Must be a positive number").safeParse(maxQuantity);

` This is my current schema, where maxQuantity is the said string. Now when I pass "d" as maxQuantity, I receive the error "Must be a positive number". How do I give an error that this is not even a number?

Solution:

``` z .string() .regex(/^[-]?\d*.?\d+$/, "Must be a number") .pipe(z.coerce.number().int("Must be an integer").positive("Must be a positive number"))...

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14 Replies

Scott Trinh•8mo ago

You have to split the string parsing and the number refinement into two steps. Luckily with pipe, this is a little more elegant than the preprocess solution we had before. Something like this:

const NumberSchema = z
  .string()
  .regex(/^[-]?\d+$/)
  .pipe(z.coerce.number().int().positive());

const NumberSchema = z
  .string()
  .regex(/^[-]?\d+$/)
  .pipe(z.coerce.number().int().positive());

https://codesandbox.io/p/devbox/pedantic-breeze-v4cc7w

Alex•8mo ago

cannot open the sandbox. what is that regex doing exactly? because I would expect my inital schema to give me an error because coerce should fail. also, because I get "Must be a positive number" as error, that means the int check was passed, which again means, coerce returned a number. that should not be the case, because coerce just uses the Number() constructor, which would give NaN when passing "d"

Scott Trinh•8mo ago

Coerce just literally calls Number(val) which doesn't fail, just returns NaN

Alex•8mo ago

correct, so how is the int check passing?

Scott Trinh•8mo ago

That regex just ensures that the string is an integer-like thing I'm not sure, to be honest.

Alex•8mo ago

I am also very confused, I will investigate further, just wanted to check I am not doing something obvious wrong

Scott Trinh•8mo ago

fwiw, when I try to run it in the codesandbox, I do get the error for int with "d" as the input oh, actually I get expected number received nan as the error. for some reason I thought number accepted nan but maybe that's changed since the last time I looked at it

Alex•8mo ago

maybe I am just reading one error for some reason, i will check nope, but still cannot access the code sandbox

Scott Trinh•8mo ago

Ahh, here ya go: https://codesandbox.io/p/devbox/pedantic-breeze-v4cc7w?file=%2Fsrc%2Findex.ts%3A11%2C40 Wasn't up to speed on all the latest codesandbox changes to sharing and permissions.

Alex•8mo ago

yes, works, thanks now using this, which works as I originally intended:

z
            .string()
            .regex(/^\d*\.?\d+$/, "Must be a number")
            .pipe(z.coerce.number().int("Must be an integer").positive("Must be a positive number"))
            .safeParse(maxQuantity);

z
            .string()
            .regex(/^\d*\.?\d+$/, "Must be a number")
            .pipe(z.coerce.number().int("Must be an integer").positive("Must be a positive number"))
            .safeParse(maxQuantity);

Scott Trinh•8mo ago

Might want to tweak the regex to allow negative numbers so that you don't reject "-100" with "Must be a number", but yeah that seems about right!

Alex•8mo ago

yes, true, thanks!

Solution

Alex•8mo ago

z
            .string()
            .regex(/^[-]?\d*\.?\d+$/, "Must be a number")
            .pipe(z.coerce.number().int("Must be an integer").positive("Must be a positive number"))
            .safeParse(maxQuantity);

z
            .string()
            .regex(/^[-]?\d*\.?\d+$/, "Must be a number")
            .pipe(z.coerce.number().int("Must be an integer").positive("Must be a positive number"))
            .safeParse(maxQuantity);

Alex•8mo ago

Thanks again, very helpfull!

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Alex - Hi there, I am trying to validate a numb...