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Getting started

Requirements
  • Next.js >= 14.3.0
  • TypeScript >= 5.0.0
  • a validation library supported by TypeSchema

next-safe-action provides a typesafe Server Actions implementation for Next.js App Router.

Validation libraries support​

We will use Zod as our validation library in this documentation, but since version 6 of next-safe-action, you can use your validation library of choice, or even multiple and custom ones at the same time, thanks to the TypeSchema library. Note that we also need to install the related TypeSchema adapter for our validation library of choice. You can find supported libraries and related adapters here.

info

If you experience an issue related to TypeSchema, check out the "Errors with TypeSchema" section of the troubleshooting page to see how to fix it.

Installation​

For Next.js >= 14, assuming you want to use Zod as your validation library, use the following command:

npm i next-safe-action zod @typeschema/zod

Find the adapter for your validation library of choice in the TypeSchema documentation.

Usage​

1. Instantiate a new client​

You can create a new client with the following code:

src/lib/safe-action.ts
import { createSafeActionClient } from "next-safe-action";

export const actionClient = createSafeActionClient();

This is a basic client, without any options or middleware functions. If you want to explore the full set of options, check out the safe action client section.

2. Define a new action​

This is how a safe action is created. Providing a validation input schema to the function via schema(), we're sure that data that comes in is type safe and validated. The action() method lets you define what happens on the server when the action is called from client, via an async function that receives the parsed input and context as arguments. In short, this is your server code. It never runs on the client:

src/app/login-action.ts
"use server"; // don't forget to add this!

import { z } from "zod";
import { actionClient } from "@/lib/safe-action";

// This schema is used to validate input from client.
const schema = z.object({
  username: z.string().min(3).max(10),
  password: z.string().min(8).max(100),
});

export const loginUser = actionClient
  .schema(schema)
  .action(async ({ parsedInput: { username, password } }) => {
    if (username === "johndoe" && password === "123456") {
      return {
        success: "Successfully logged in",
      };
    }

    return { failure: "Incorrect credentials" };
  });

action returns a function that can be called from the client.

3. Import and execute the action​

In this example, we're directly calling the Server Action from a Client Component:

src/app/login.tsx
"use client"; // this is a Client Component

import { loginUser } from "./login-action";

export default function Login() {
  return (
    <button
      onClick={async () => {
        // Typesafe action called from client.
        const res = await loginUser({
          username: "johndoe",
          password: "123456",
        });

        // Result keys.
        const {
          data,
          validationErrors,
          bindArgsValidationErrors,
          serverError,
        } = res;
      }}>
      Log in
    </button>
  );
}

You also can execute Server Actions with hooks, which are a more powerful way to handle mutations. For more information about these, check out the useAction, useOptimisticAction and useStateAction hooks sections.