make a new string-specific validations isLowerCase & isUpperCase about zod HOT 3 CLOSED

No need to check if it's lowercase, just make it lowercase.

const schema = z.object( { username: z.string().toLowerCase() } )

console.log( schema.parse( { username: 'Foo' } ) ) // { username: 'foo' }
console.log( schema.parse( { username: 'FOO' } ) ) // { username: 'foo' }
console.log( schema.parse( { username: 'FoO' } ) ) // { username: 'foo' }

If you found my answer satisfactory, please consider supporting me. Even a small amount is greatly appreciated. Thanks friend! 🙏
https://github.com/sponsors/JacobWeisenburger

from zod.

Is there a reason you need to know if something is lower case? Because you can just as easily change it to lower case without ever needing to check it.

from zod.

check this, for lowercase, if u want uppercase just change str.toLowerCase() to str.toUpperCase()

name: z.string().min(1, "name is required").max(100).refine((str: string) => str === str.toLowerCase(), "Name must be Lowercase")

from zod.