---
title: SSR
lang: en-US
---
# Server-Side Rendering (SSR)
When using Element Plus for SSR development, you need to carry out special handling during SSR to avoid hydrate errors.
:::tip
For Nuxt users, we provide a [Nuxt module](https://github.com/element-plus/element-plus-nuxt) that contains these special processes. You only need to install it.
:::
## Provide an ID
The provided value is used to generate the unique ID in Element Plus.
Because the different IDs are prone to hydrate errors in SSR, in order to ensure that the server side and client side generate the same ID, we need to inject the `ID_injection_key` into Vue.
```ts [main.ts]
// irrelevant code omitted
import { createApp } from 'vue'
import { ID_INJECTION_KEY } from 'element-plus'
import App from './App.vue'
const app = createApp(App)
app.provide(ID_INJECTION_KEY, {
prefix: 1024,
current: 0,
})
```
## Provide ZIndex
When you using SSR for development, you may encounter hydration errors caused by `z-index`. In this case, we recommend injecting an initial value to avoid such errors.
```ts [main.ts]
// irrelevant code omitted
import { createApp } from 'vue'
import { ZINDEX_INJECTION_KEY } from 'element-plus'
import App from './App.vue'
const app = createApp(App)
app.provide(ZINDEX_INJECTION_KEY, { current: 0 })
```
## Teleports
[Teleport](https://vuejs.org/guide/scaling-up/ssr.html#teleports) is used internally by multiple components in Element Plus (eg. ElDialog, ElDrawer, ElTooltip, ElDropdown, ElSelect, ElDatePicker ...), so special handling is required during SSR.
### Render the Teleport on the mount
An easier solution is to conditionally render the Teleport on the mount.
For example, use the `ClientOnly` component in Nuxt.
```html
tooltip
```
or
```vue
tooltip
```
### Inject the teleport markup
Another way is to inject the teleport markup into the correct location in your final page HTML.
You need to inject the teleport markup close to the `` tag.
```html
Element Plus
```
:::tip
If you modify the [Namespace](./namespace.md) or `append-to` attribute, you need to adjust the `#el-popper-container-` value.
:::
```js [src/entry-server.js]
// irrelevant code omitted
import { renderToString } from 'vue/server-renderer'
import { createApp } from './main'
export async function render(url, manifest) {
// ...
const ctx = {}
const html = await renderToString(app, ctx)
const preloadLinks = renderPreloadLinks(ctx.modules, manifest)
const teleports = renderTeleports(ctx.teleports)
return [html, preloadLinks, teleports]
}
function renderTeleports(teleports) {
if (!teleports) return ''
return Object.entries(teleports).reduce((all, [key, value]) => {
if (key.startsWith('#el-popper-container-')) {
return `${all}${value}
`
}
return all
}, teleports.body || '')
}
```
```js [server.js or prerender.js]
// irrelevant code omitted
const [appHtml, preloadLinks, teleports] = await render(url, manifest)
const html = template
.replace('', preloadLinks)
.replace('', appHtml)
.replace(/(\n|\r\n)\s*/, teleports)
```