This adapter offers a way to seamlessly integrate next-safe-action with react-hook-form.

Requirements

• React >= 18.2.0
• Next.js >= 14.0.0
• next-safe-action >= 7.6.0
• react-hook-form >= 7.0.0
• @hookform/resolvers >= 3.0.0

Installation

npm i next-safe-action react-hook-form @hookform/resolvers @next-safe-action/adapter-react-hook-form

Example

The best way to learn how to use this adapter is to take a look at the examples. The app in this repository shows you how to use the useHookFormAction and useHookFormOptimisticAction hooks:

• useHookFormAction example (login)
• useHookFormOptimisticAction example (todos)

Hooks

useHookFormAction

This hook is a wrapper around useAction from next-safe-action and useForm from react-hook-form that makes it much easier to use safe actions with react-hook-form. It also maps validation errors to FieldErrors compatible with react-hook-form.

Example (login)

1. First of all, we need a shared file to store our validation schema(s). In this case, the loginSchema Zod validator is exported from validation.ts:

import { z } from "zod";

export const loginSchema = z.object({
	username: z.string().min(3).max(30),
	password: z.string().min(8).max(100),
});

2. Then, we can create our login action using loginSchema:

"use server";

import { returnValidationErrors } from "next-safe-action";
import { actionClient } from "@/lib/safe-action";
import { loginSchema } from "./validation";
import { checkCredentials } from "@/services/auth";

export const loginAction = actionClient.schema(loginSchema).action(async ({ parsedInput }) => {
	const valid = await checkCredentials(parsedInput.username, parsedInput.password);

	// If the credentials are invalid, return root validation error.
	if (!valid) {
		returnValidationErrors(loginSchema, {
			_errors: ["Invalid username or password"],
		});
	}

	return {
		successful: true,
	};
});

3. Finally, we can use useHookFormAction in our Client Component, by passing to it the loginSchema and loginAction declared above:

"use client";

import { useHookFormAction } from "@next-safe-action/adapter-react-hook-form/hooks";
import { zodResolver } from "@hookform/resolvers/zod";
import { loginSchema } from "./validation";
import { loginAction } from "./login-action";

export function LoginForm() {
	const { form, action, handleSubmitWithAction, resetFormAndAction } = useHookFormAction(
		loginAction,
		zodResolver(loginSchema),
		{
			actionProps: {},
			formProps: {},
			errorMapProps: {},
		}
	);

	return <form onSubmit={handleSubmitWithAction}>...</form>;
}

Parameters

• safeAction: the safe action (required)
• hookFormResolver: a react-hook-form validation resolver (required)
• props: props for useAction, useForm and error mapper (optional)

Return values (object)

• form: the react-hook-form form
• action: the next-safe-action action
• handleSubmitWithAction: a function that handles form submission by automatically executing the action
• resetFormAndAction: a function that resets the form and the action state

useHookFormOptimisticAction

This hook is a wrapper around useOptimisticAction from next-safe-action and useForm from react-hook-form that makes it much easier to use safe actions with react-hook-form. It also maps validation errors to FieldErrors compatible with react-hook-form.

Example (add todo)

1. First of all, we need a shared file to store our validation schema(s). In this case, the addTodoSchema Zod validator is exported from validation.ts:

import { z } from "zod";

export const addTodoSchema = z.object({
	newTodo: z.string().min(1).max(200),
});

2. Then, we can create our add todo action using addTodoSchema:

"use server";

import { returnValidationErrors } from "next-safe-action";
import { revalidatePath } from "next/cache";
import { actionClient } from "@/lib/safe-action";
import { addTodoSchema } from "./validation";
import { badWordsCheck } from "@/utils";
import { saveTodoInDb } from "@/services/db";

export const addTodoAction = actionClient.schema(addTodoSchema).action(async ({ parsedInput }) => {
	const containsBadWords = badWordsCheck(parsedInput.newTodo);

	// If the todo con
	if (containsBadWords) {
		returnValidationErrors(addTodoSchema, {
			newTodo: {
				_errors: ["The todo contains bad words!"],
			},
		});
	}

	await saveTodoInDb(parsedInput.newTodo);
	revalidatePath("/");

	return {
		newTodo: parsedInput.newTodo,
	};
});

3. Finally, we can use useHookFormOptimisticAction in our Client Component, by passing to it the addTodoSchema and addTodoAction declared above:

"use client";

import { useHookFormOptimisticAction } from "@next-safe-action/adapter-react-hook-form/hooks";
import { zodResolver } from "@hookform/resolvers/zod";
import { addTodoSchema } from "./validation";
import { addTodoAction } from "./addtodo-action";

type Props = {
	todos: string[];
};

// Todos are passed from the parent Server Component and updated each time a new todo is added
// thanks to the `revalidatePath` function called inside the action.
export function AddTodoForm({ todos }: Props) {
	const { form, action, handleActionSubmit, resetFormAndAction } = useHookFormOptimisticAction(
		addTodoAction,
		zodResolver(addTodoSchema),
		{
			actionProps: {
				currentState: {
					todos,
				},
				updateFn: (state, input) => {
					return {
						todos: [...state.todos, input.newTodo],
					};
				},
			},
			formProps: {},
			errorMapProps: {},
		}
	);

	return <form onSubmit={handleActionSubmit}></form>;
}

Parameters

• safeAction: the safe action (required)
• hookFormResolver: a react-hook-form validation resolver (required)
• props: props for useOptimisticAction, useForm and error mapper. actionProps.currentState and actionProps.updateFn are required by the useOptimisticAction hook used under the hood, the rest are optional. (required/optional)

Return values (object)

• form: the react-hook-form form
• action: the next-safe-action action
• handleSubmitWithAction: a function that handles form submission by automatically executing the action
• resetFormAndAction: a function that resets the form and the action state

useHookFormActionErrorMapper

For more control over the execution flow, you can use this hook to get back the memoized mapped validation errors of the action. It can be useful for cases when you need to use both useAction and useForm in your Client Component, for a particular task, or when you want to create custom hooks.

Example (Client Component)

1. We'll reuse the loginSchema and loginAction from the useHookFormAction example here.

2. Here's how you would use useHookFormActionErrorMapper in your Client Component:

"use client";

import { useHookFormActionErrorMapper } from "@next-safe-action/adapter-react-hook-form/hooks";
import { zodResolver } from "@hookform/resolvers/zod";
import { loginSchema } from "./validation";
import { loginAction } from "./login-action";
import { useAction } from "next-safe-action/hooks";
import { useForm } from "react-hook-form";
import { Infer } from "next-safe-action/adapters/types";

export function CustomForm() {
	const action = useAction(loginAction);

	const { hookFormValidationErrors } = useHookFormActionErrorMapper<typeof loginSchema>(
		action.result.validationErrors,
		{ joinBy: "\n" }
	);

	const form = useForm<Infer<typeof loginSchema>>({
		resolver: zodResolver(loginSchema),
		errors: hookFormValidationErrors,
	});

	return <form onSubmit={form.handleSubmit(action.executeAsync)}>...</form>;
}

Parameters

• validationErrors: next-safe-action object of ValidationErrors, or undefined (required)
• props: joinBy from ErrorMapperProps type. It's used to determine how to join the error messages, if more than one is present in the errors array. It defaults to " " (optional)

Return values (object)

• hookFormValidationErrors: object of mapped errors with FieldErrors type, compatible with react-hook-form

Utilities

mapToHookFormErrors

For more advanced stuff, you can directly use the mapToHookFormErrors function that is utilized under the hood to map next-safe-action ValidationErrors to react-hook-form compatible FieldErrors.

Example

import { mapToHookFormErrors } from "@next-safe-action/adapter-react-hook-form";
import { loginAction } from "./login-action";
import type { loginSchema } from "./validation";

async function advancedStuff() {
	const result = await loginAction({ username: "foo", password: "bar" });
	const hookFormValidationErrors = mapToHookFormErrors<typeof loginSchema>(result?.validationErrors, { joinBy: "\n" });

	// Do something with `hookFormValidationErrors`...
}

Parameters

• validationErrors: next-safe-action object of ValidationErrors, or undefined (required)
• props: joinBy from ErrorMapperProps type. It's used to determine how to join the error messages, if more than one is present in the errors array. It defaults to " " (optional)

Return value

• mapped errors: object of mapped errors with FieldErrors type, compatible with react-hook-form

Types

/

ErrorMapperProps

Props for mapToHookFormErrors. Also used by the hooks.

export type ErrorMapperProps = {
	joinBy?: string;
};

/hooks

HookProps

Optional props for useHookFormAction and useHookFormOptimisticAction.

export type HookProps<
	ServerError,
	S extends Schema | undefined,
	BAS extends readonly Schema[],
	CVE,
	CBAVE,
	Data,
	FormContext = any,
> = {
	errorMapProps?: ErrorMapperProps;
	actionProps?: HookBaseUtils<S> & HookCallbacks<ServerError, S, BAS, CVE, CBAVE, Data>;
	formProps?: Omit<UseFormProps<S extends Schema ? Infer<S> : any, FormContext>, "resolver">;
};

UseHookFormActionHookReturn

Type of the return object of the useHookFormAction hook.

export type UseHookFormActionHookReturn<
	ServerError,
	S extends Schema | undefined,
	BAS extends readonly Schema[],
	CVE,
	CBAVE,
	Data,
	FormContext = any,
> = {
	action: UseActionHookReturn<ServerError, S, BAS, CVE, CBAVE, Data>;
	form: UseFormReturn<S extends Schema ? Infer<S> : any, FormContext>;
	handleSubmitWithAction: (e?: React.BaseSyntheticEvent) => Promise<void>;
	resetFormAndAction: () => void;
};

UseHookFormOptimisticActionHookReturn

Type of the return object of the useHookFormOptimisticAction hook.

export type UseHookFormOptimisticActionHookReturn<
	ServerError,
	S extends Schema | undefined,
	BAS extends readonly Schema[],
	CVE,
	CBAVE,
	Data,
	State,
	FormContext = any,
> = Omit<UseHookFormActionHookReturn<ServerError, S, BAS, CVE, CBAVE, Data, FormContext>, "action"> & {
	action: UseOptimisticActionHookReturn<ServerError, S, BAS, CVE, CBAVE, Data, State>;
};

Infer types

You can use these utility types exported from the /hooks path to infer the return types of the hooks.

InferUseHookFormActionHookReturn

Infer the type of the return object of the useHookFormAction hook.

export type InferUseHookFormActionHookReturn<T extends Function, FormContext = any> =
	T extends SafeActionFn<
		infer ServerError,
		infer S extends Schema | undefined,
		infer BAS extends readonly Schema[],
		infer CVE,
		infer CBAVE,
		infer Data
	>
		? UseHookFormActionHookReturn<ServerError, S, BAS, CVE, CBAVE, Data, FormContext>
		: never;

InferUseHookFormOptimisticActionHookReturn

Infer the type of the return object of the useHookFormOptimisticAction hook.

export type InferUseHookFormOptimisticActionHookReturn<T extends Function, State, FormContext = any> =
	T extends SafeActionFn<
		infer ServerError,
		infer S extends Schema | undefined,
		infer BAS extends readonly Schema[],
		infer CVE,
		infer CBAVE,
		infer Data
	>
		? UseHookFormOptimisticActionHookReturn<ServerError, S, BAS, CVE, CBAVE, Data, State, FormContext>
		: never;

License

This project is released under the MIT License.