Validate for specific path or using custom schema

[Prajwalg19]

I was looking to validate a form in my stepper flow. I wanted to validate for a specific step to let the user to move the next step. Superforms have this https://superforms.rocks/concepts/client-validation#validate

[dosubot]

Hi @Prajwalg19! I'm Dosu and I’m helping the formisch team.

Formisch currently does not support validating specific paths or using a custom schema for partial validation. The validate() method always validates the entire form against the full schema, with no path or schema override parameter [1]. This has been discussed previously in issue #72 as well [2].

For stepper/wizard flows, here are some workarounds:

1. Use separate form instances per step — each step gets its own schema and useForm(), so calling validate() only validates that step's fields.
2. Manual validation with setErrors() — validate fields yourself (e.g. with Valibot's safeParse on a partial schema) and use setErrors(path, errors) to surface errors on specific fields [3].
3. Conditional error display — validate the full form but only show errors for fields in the current step using field.isTouched [2].

A dedicated validate(path) or validate(customSchema) API doesn't exist yet, so this looks like a valid feature request.

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[fabian-hiller]

I can confirm Dosu's comment. Let me know if you have more questions. I plan to look into native multi step form support in the next months.

[Prajwalg19]

Dosu seems to be a very good bot !!. That is a nice workaround, but would love it be supported in the library itself. Also thanks for the library fabian, switched from superforms to formisch and loving the api. But i had to migrate from zod to valibot though. Also just an addon, can we have server-side validation like supeforms does?, in superforms we define a single schema and use that in both client and server (+page.svelte & +page.server.ts).

[fabian-hiller]

Yes, native server support for meta frameworks is on my list for the next 1 to 3 months.