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## Description Follow up #52038. Remove `https://nextjs.org` from URL in [error pages](https://github.com/vercel/next.js/tree/canary/errors). ### Improving Documentation - [x] Run `pnpm prettier-fix` to fix formatting issues before opening the PR. - [x] Read the Docs Contribution Guide to ensure your contribution follows the docs guidelines: https://nextjs.org/docs/community/contribution-guide --------- Co-authored-by: Delba de Oliveira <[email protected]>
44 lines
1.4 KiB
Plaintext
44 lines
1.4 KiB
Plaintext
---
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title: 'Invalid "use server" Value'
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---
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## Why This Error Occurred
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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.
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These functions are required to be defined as async, because `"use server"` marks them as [Server Actions](/docs/app/building-your-application/data-fetching/server-actions-and-mutations) and they can be invoked directly from the client through a network request.
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Examples of incorrect code:
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```js
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'use server'
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// ❌ This is incorrect: only async functions are allowed.
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export const value = 1
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// ❌ This is incorrect: missed the `async` keyword.
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export function getServerData() {
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return '...'
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}
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```
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Correct code:
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```js
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'use server'
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// ✅ This is correct: an async function is exported.
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export async function getServerData() {
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return '...'
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}
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```
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## Possible Ways to Fix It
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Check all exported values in the `"use server"` file (including `export *`) and make sure that they are all defined as async functions.
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## Useful Links
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- [Server Actions and Mutations - Next.js](/docs/app/building-your-application/data-fetching/server-actions-and-mutations)
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- ['use server' directive - React](https://react.dev/reference/react/use-server)
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