Zod Schema: How to make a field optional OR have a minimum string contraint?

user_2111515 0
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I have a field where I want the value to either be optional OR have the field have a minimum length of 4.

I've tried the following:

export const SocialsSchema = z.object({
  myField: z.optional(z.string().min(4, "Please enter a valid value")),
});

This passes if I used a value like: "good", but if I've got an empty value then it fails.

How do I correctly implement a constraint using zod schemas to make an optional value with a minimum constraint if the value is not empty?

Is it possible to do this without using regex or a regex solution the only way?

zod typescript schema javascript
1 Answers

Here you are:

import { z } from "zod";

export const SocialsSchema = z.object({
  myField: z.string().min(4, "Please enter a valid value").optional()
});
// ok
console.log(SocialsSchema.parse({ myField: undefined }));

// ok
console.log(SocialsSchema.parse({ myField: "1234" }));

// ok
console.log(SocialsSchema.parse({ myField: "" }));

// throws min error
console.log(SocialsSchema.parse({ myField: "123" }));
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