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TanStack · Function

mergeForm

mergeForm merges a base form with another form state and returns a FormApi. It is commonly used in a transform to apply server-returned state to a client form.

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Syntax

function mergeForm<TFormData, TOnMount, TOnChange, TOnChangeAsync, TOnBlur, TOnBlurAsync, TOnSubmit, TOnSubmitAsync, TOnDynamic, TOnDynamicAsync, TOnServer, TSubmitMeta>(baseForm, state): FormApi<TFormData, TOnMount, TOnChange, TOnChangeAsync, TOnBlur, TOnBlurAsync, TOnSubmit, TOnSubmitAsync, TOnDynamic, TOnDynamicAsync, TOnServer, TSubmitMeta>

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  • useTransform
  • useForm
  • FormApi
  • formOptions
  • initialFormState

Source: mergeForm | TanStack Form Docs. Checked 2026-11-03.