Zod - Validate Specific Field from Schema (good for forms)

zod-utils.ts

type R = Record<string | number, any>

export function parseFieldSafe<T extends Zod.AnyZodObject, K extends keyof Zod.infer<T>>(
  obj: T,
  key: K,
  value: T[K],
): Zod.SafeParseReturnType<R, R> {
  return obj.pick({ [key]: true as const }).safeParse({ [key]: value })
}

export function isFieldValid<T extends Zod.AnyZodObject, K extends keyof Zod.infer<T>>(
  obj: T,
  key: K,
  value: T[K],
): boolean {
  return parseFieldSafe(obj, key, value).success
}

export function parseField<T extends Zod.AnyZodObject, K extends keyof Zod.infer<T>>(
  obj: T,
  key: K,
  value: T[K],
): T {
  return obj.pick({ [key]: true as const }).parse({ [key]: value }) as T
}