next.js/errors/invalid-use-server-value.mdx

---
title: 'Invalid "use server" Value'
---

## Why This Error Occurred

This error occurs when a `"use server"` file exports a value that is not an async function. It might happen when you unintentionally export something like a configuration object, an arbitrary value, or missed the `async` keyword in the exported function declaration.

These functions are required to be defined as async, because `"use server"` marks them as [Server Actions](/docs/app/getting-started/mutating-data) and they can be invoked directly from the client through a network request.

Examples of incorrect code:

```js
'use server'

// ❌ This is incorrect: only async functions are allowed.
export const value = 1

// ❌ This is incorrect: missed the `async` keyword.
export function getServerData() {
  return '...'
}
```

Correct code:

```js
'use server'

// ✅ This is correct: an async function is exported.
export async function getServerData() {
  return '...'
}
```

## Possible Ways to Fix It

Check all exported values in the `"use server"` file (including `export *`) and make sure that they are all defined as async functions.

## Useful Links

- [Server Actions and Mutations - Next.js](/docs/app/getting-started/mutating-data)
- ['use server' directive - React](https://react.dev/reference/react/use-server)