next.js/docs/01-app/03-api-reference/05-config/01-next-config-js/basePath.mdx

---
title: basePath
description: Use `basePath` to deploy a Next.js application under a sub-path of a domain.
---

{/* The content of this doc is shared between the app and pages router. You can use the `<PagesOnly>Content</PagesOnly>` component to add content that is specific to the Pages Router. Any shared content should not be wrapped in a component. */}

To deploy a Next.js application under a sub-path of a domain you can use the `basePath` config option.

`basePath` allows you to set a path prefix for the application. For example, to use `/docs` instead of `''` (an empty string, the default), open `next.config.js` and add the `basePath` config:

```js filename="next.config.js"
module.exports = {
  basePath: '/docs',
}
```

> **Good to know**: This value must be set at build time and cannot be changed without re-building as the value is inlined in the client-side bundles.

### Links

When linking to other pages using `next/link` and `next/router` the `basePath` will be automatically applied.

For example, using `/about` will automatically become `/docs/about` when `basePath` is set to `/docs`.

```js
export default function HomePage() {
  return (
    <>
      <Link href="/about">About Page</Link>
    </>
  )
}
```

Output html:

```html
<a href="/docs/about">About Page</a>
```

This makes sure that you don't have to change all links in your application when changing the `basePath` value.

### Images

<AppOnly>

When using the [`next/image`](/docs/app/api-reference/components/image) component, you will need to add the `basePath` in front of `src`.

</AppOnly>

<PagesOnly>

When using the [`next/image`](/docs/pages/api-reference/components/image) component, you will need to add the `basePath` in front of `src`.

</PagesOnly>

For example, using `/docs/me.png` will properly serve your image when `basePath` is set to `/docs`.

```jsx
import Image from 'next/image'

function Home() {
  return (
    <>
      <h1>My Homepage</h1>
      <Image
        src="/docs/me.png"
        alt="Picture of the author"
        width={500}
        height={500}
      />
      <p>Welcome to my homepage!</p>
    </>
  )
}

export default Home
```