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+---
+id: useTransform
+title: useTransform
+---
+
+# Function: useTransform()
+
+```ts
+function useTransform(
+  fn: (formBase: AnyFormApi) => AnyFormApi,
+  deps?: unknown[],
+): (data: unknown) => unknown;
+```
+
+A hook used in SSR meta-framework adapters (TanStack Start, Next.js, Remix) to merge server-returned form state with the client-side form instance.
+
+Pass the result directly to the `transform` option of `useForm`. Under the hood it is a stable `useCallback` wrapper, so it only recreates the transform function when `deps` change.
+
+## Parameters
+
+### fn
+
+`(formBase: AnyFormApi) => AnyFormApi`
+
+A function that receives the base form API and returns a transformed form API. Typically calls `mergeForm(baseForm, serverState)` to layer server validation errors or default values on top of the client form.
+
+### deps?
+
+`unknown[]`
+
+Dependency array for the callback, identical to `useCallback`'s second argument. Include any reactive values referenced inside `fn`.
+
+## Returns
+
+`(data: unknown) => unknown`
+
+A stable transform function suitable for the `transform` option of `useForm`.
+
+## Example
+
+```ts
+import { mergeForm, useForm, useTransform } from '@tanstack/react-form-start'
+
+// serverState comes from a loader / action / server function
+const form = useForm({
+  ...formOpts,
+  transform: useTransform(
+    (baseForm) => mergeForm(baseForm, serverState),
+    [serverState],
+  ),
+})
+```
+
+## Notes
+
+- This hook is exported from the meta-framework adapter packages (`@tanstack/react-form-start`, `@tanstack/react-form-nextjs`, `@tanstack/react-form-remix`), not from `@tanstack/react-form` itself.
+- For a full SSR integration example see the [React Meta-Framework Usage guide](../guides/ssr.md).
+
+## Defined in
+
+[packages/react-form-nextjs/src/useTransform.ts](https://github.com/TanStack/form/blob/main/packages/react-form-nextjs/src/useTransform.ts)