---
title: assetPrefix
description: Learn how to use the assetPrefix config option to configure your CDN.
url: "https://nextjs.org/docs/14/app/api-reference/next-config-js/assetPrefix"
version: 14.2.35
lastUpdated: 2024-09-13
prerequisites:
  - "API Reference: /docs/14/app/api-reference"
  - "next.config.js Options: /docs/14/app/api-reference/next-config-js"
---


> **Good to know**: Next.js 9.5+ added support for a customizable [Base Path](/docs/app/api-reference/next-config-js/basePath), which is better
> suited for hosting your application on a sub-path like `/docs`.
> We do not suggest you use a custom Asset Prefix for this use case.

To set up a [CDN](https://en.wikipedia.org/wiki/Content_delivery_network), you can set up an asset prefix and configure your CDN's origin to resolve to the domain that Next.js is hosted on.

Open `next.config.js` and add the `assetPrefix` config:

```js filename="next.config.js"
const isProd = process.env.NODE_ENV === 'production'

module.exports = {
  // Use the CDN in production and localhost for development.
  assetPrefix: isProd ? 'https://cdn.mydomain.com' : undefined,
}
```

Next.js will automatically use your asset prefix for the JavaScript and CSS files it loads from the `/_next/` path (`.next/static/` folder). For example, with the above configuration, the following request for a JS chunk:

```
/_next/static/chunks/4b9b41aaa062cbbfeff4add70f256968c51ece5d.4d708494b3aed70c04f0.js
```

Would instead become:

```
https://cdn.mydomain.com/_next/static/chunks/4b9b41aaa062cbbfeff4add70f256968c51ece5d.4d708494b3aed70c04f0.js
```

The exact configuration for uploading your files to a given CDN will depend on your CDN of choice. The only folder you need to host on your CDN is the contents of `.next/static/`, which should be uploaded as `_next/static/` as the above URL request indicates. **Do not upload the rest of your `.next/` folder**, as you should not expose your server code and other configuration to the public.

While `assetPrefix` covers requests to `_next/static`, it does not influence the following paths:
---

For an index of all available documentation, see [/docs/14/llms.txt](/docs/14/llms.txt)