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TanStack is a community of passionate software engineers striving for high-quality, open-source software for web devs

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react-query-questions

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extended-salmon

10/10/2025

How to make the default value of a field nullable?

I use Zod validation. I have an enum of programming languages, and have a field for choosing them. I want nothing to be in that field by default. TypeScript errors out because of the default value being set to undefined or null which don't pass as a string for the enum. Also, I can't set the value back to null or undefined or something similar from the field context. I don't really want to use empty strings.

judicial-coral

10/8/2025

How to update defaultValues?

I have two components: one of them is a list of entries, and the other one is details of the selected entry. It accepts id of the selected entry as a prop, loads existing values with TSQuery, and uses them as defaultValues. Simple reproduction: https://stackblitz.com/edit/vitejs-vite-ainjeqwv?file=src%2FApp.tsx ...

judicial-coral

10/8/2025

Splitting form between components

Hi! I doing something like this: ```ts export function ContentItemDetails({ id }: { id: string }) { const form = useAppForm({ defaultValues: {...

xenial-black

10/6/2025

full state management with tanstack form with seperate components

i want to create seperate component and unifed them in form and can i or should use all the states with tanstack form? like is thera a pattern for that? its a very complex form basically what im trying to achieve is, i want to manage the variations assign accounts every state trough tanstack-form so it can validate with zod...

tame-yellow

10/6/2025

Setting multiple form fields

I am trying to set multiple form fields from an async typeahead. A good example of this might be an address typeahead where the address fields are set upon user selection. I have a field group implemented via withFieldGroup where I am using group.setFieldValue to set everything on select. I haven't quite figured out how to handle the field meta values and I am unsure if this is even a reasonable approach. Is there an idiomatic way of doing this?

exotic-emerald

10/6/2025

Cannot read properties of undefined (reading 'length')

When using field().pushValue on @tanstack/solid-form the error: Cannot read properties of undefined (reading 'length') occurs. Currently on v1.23.5 on tanstack/solid-form. Is anybody else experiencing this?...

helpful-purple

9/29/2025

Dynamic form fields from database based on field value

Hi, I'm struggling to find a solution were I have a form with a field that determines what other fields to display based on the database tables. For example, Field: Asset Type = enum On field selection, get attribute field definitions from db and display attribute fields...

absent-sapphire

9/29/2025

Form devtools panel blank in latest version

Hey everyone! 👋 Quick question about the new devtools - loving the release btw! Issue: The devtools panel shows empty when using @tanstack/react-form-devtools >= v0.1.1...

quickest-silver

9/29/2025

I need some help with two input that depends on each other

The first image shows the use case: I want to preselect an option if the select has only one option available. I tried to use the forn.setFieldValue on the form field listeners or the onChange but I was getting different issues with those options There's an standard way to watch for an input value and if the input changes I check on a list, it could be a fetch from and endpoint or a json and I want to set the value from that json...

rare-sapphire

9/26/2025

getHeader is not a function when using Tanstack Form with Tanstack Start RC

Repro: https://stackblitz.com/edit/tanstack-form-tdx1ytd7?file=vite.config.ts Unfortunately a separate already reported error prevents the repro from running in stack blitz but can still download if needed. ``` Server Fn Error!...

other-emerald

9/26/2025

undefined formMeta on first render

Hello , when running the following example

const form = useForm({ defaultValues: { name: "" } });
console.log("form meta api", form.state.fieldMeta.name);

const form = useForm({ defaultValues: { name: "" } });
console.log("form meta api", form.state.fieldMeta.name);

...

hilarious-sapphire

9/25/2025

Form gets reset to old pre-reset default values on re-render

Reproduction: https://stackblitz.com/edit/tanstack-form-eoqappkk?file=src%2Findex.tsx 1. Enter some new values into the form (not dirty -> dirty) 2. Click "Save" (dirty -> not dirty) 3. Click "Rerender" ⚠️ -> form gets reset to old values (but also remains non dirty) ⚠️...

optimistic-gold

9/24/2025

how to validate with yup since yup is Standard Schema compatible?

in very short, if i pass yup.number() to a onChange field validator i get an error async function passed to sync validator. i checked the ~standard prop of the schema and the validate prop is an async function. so it makes sense that the error is thrown since i see that the standardSchemaValidator checks this. but which is the right way to add the yup schema?...

fair-rose

9/23/2025

How to get listener fn type?

I have a very simple goal on my form that i use with useAppForm. I have an onChange inside listener and i'm passing a function to it. All i need, is to be able to type the parameters of my custom function to match onChange. Here is an example: ```...

plain-purple

9/23/2025

How to use form validation through Schema Libraries ?

But that each are validated indiidually onChange/Onblur, but not all field at once like it is by default?

subsequent-cyan

9/22/2025

Field level validation possible?

Field level validation possible? I'm working on an webapp with many forms and many types of input. If I have a input field <AgeInputField/>, I want to do the input validation inside this component, not on the form level....

cloudy-cyan

9/19/2025

TypeScript: pass result of useForm as component props

Hi, I am trying to pass my form created by useForm via props to a child component but I am not sure how to properly type it in the TypeScript. Here is an example:...

rival-black

9/18/2025

How to do sub field validation?

``` const form = useZeroAppForm({ defaultValues: { create_user: createUserDefaultValues, create_vendor: createVendorDefaultValues,...

noble-gold

9/17/2025

serverValidation with zod

Hello! I’m exploring the server-validation feature in TanStack Form and saw issue #1704 (“Zod errors from server action aren’t propagated to field error”). Is using a Zod schema in createServerValidate({ onServerValidate }) an intended/supported path for server validation (alongside the Standard Schema adapter)?...

eastern-cyan

9/16/2025

React 17 type issue

When I try to use tanstack form in a existing project that uses the latest versions of react 17 and it's types, I'm getting back:

``
form.AppField cannot be used as a JSX component.
Its return type

ReactNode

 is not a valid JSX element.
Type

undefined is not assignable to type Element | null`...

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TanStack

TanStack is a community of passionate software engineers striving for high-quality, open-source software for web devs

TanStack

TanStack is a community of passionate software engineers striving for high-quality, open-source software for web devs