next.js/errors/invalid-page-config.mdx

---
title: Invalid Page / API Route Config
---

## Why This Error Occurred

In one of your pages or API Routes, you used `export const config` with an invalid value.

## Possible Ways to Fix It

- The page's `config` must be an object initialized directly when being exported and not modified dynamically.
- The `config` object must only contain static constant literals without expressions.

<table>
<thead>
  <tr>
    <th>Not Allowed</th>
    <th>Allowed</th>
  </tr>
</thead>
<tbody>

<tr>
<td>

```js
// `config` should be an object
export const config = 'hello world'
```

</td>
<td>

```js
export const config = {}
```

</td>
</tr>

<tr>
<td>

```js
// `config.runtime` contains a dynamic expression
export const config = {
  runtime: `node${'js'}`,
}
```

</td>
<td>

```js
export const config = {
  runtime: 'nodejs',
}
export const config = {
  runtime: `edge`,
}
```

</td>
</tr>

<tr>
<td>

```js
// Re-exported `config` is not allowed
export { config } from '../config'
```

</td>
<td>

```js
export const config = {}
```

</td>
</tr>

</tbody>
</table>

## Useful Links

- [API Routes Request Helpers](/docs/pages/building-your-application/routing/api-routes)
- [Edge Runtime](/docs/app/api-reference/edge)