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Enitoni
May 2, 2026

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Answered by yudin-s May 13, 2026

inputValidator does not have to be Zod-specific. The function just needs to take the incoming data and return the validated/transformed data, or throw if the input is invalid.

With a custom validator, the shape is roughly:

const createThing = createServerFn({ method: "POST" })
  .inputValidator((input: unknown) => {
    const result = myValidator(input)

    if (!result.ok) {
      throw new Error(result.message)
    }

    return result.value
  })
  .handler(async ({ data }) => {
    // data is the value returned by inputValidator
  })

If your validation library returns structured errors, wrap those in your own error type, or throw a response/error shape your app knows how to display.

Th…

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