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# @emotion/cache
### createCache
`createCache` allows for low level customization of how styles get inserted by emotion. It's intended to be used with the [`<CacheProvider/>`](https://emotion.sh/docs/cache-provider) component to override the default cache, which is created with sensible defaults for most applications.
```javascript
import createCache from '@emotion/cache'
export const myCache = createCache({
key: 'my-prefix-key',
stylisPlugins: [
/* your plugins here */
]
})
```
### Primary use cases
- Using emotion in embedded contexts such as an `<iframe/>`
- Setting a [nonce](#nonce-string) on any `<style/>` tag emotion creates for security purposes
- Using emotion with a developer defined `<style/>` tag
- Using emotion with custom Stylis plugins
## Options
### `nonce`
`string`
A nonce that will be set on each style tag that emotion inserts for [Content Security Policies](https://developer.mozilla.org/en-US/docs/Web/HTTP/CSP).
### `stylisPlugins`
`Array<Function>`
A Stylis plugins that will be run by Stylis during preprocessing. [Read the Stylis docs to find out more](https://github.com/thysultan/stylis.js#middleware). This can be used for many purposes such as RTL.
> Note:
>
> Prefixer is just a plugin which happens to be put in default `stylisPlugins`. If you plan to use custom `stylisPlugins` and you want to have your styles prefixed automatically you must include prefixer in your custom `stylisPlugins`. You can import `prefixer` from the `stylis` module to do that (`import { prefixer } from 'stylis'`);
### `key`
`string (Pattern: [^a-z-])`
The prefix before class names. It will also be set as the value of the `data-emotion` attribute on the style tags that emotion inserts and it's used in the attribute name that marks style elements in `renderStylesToString` and `renderStylesToNodeStream`. This is **required if using multiple emotion caches in the same app**.
### `container`
`Node`
A DOM node that emotion will insert all of its style tags into. This is useful for inserting styles into iframes or windows.
### `prepend`
`boolean`
A boolean representing whether to prepend rather than append style tags into the specified container DOM node.
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