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next.js/errors/no-document-title.md

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# `<title>` should not be used in _document.js's `<Head>`
#### Why This Error Occurred
Adding `<title>` in `pages/_document.js` will lead to unexpected results with `next/head` since `_document.js` is only rendered on the initial pre-render.
#### Possible Ways to Fix It
Set `<title>` in `pages/_app.js` instead :
```js
// pages/_app.js
import App, {Container} from 'next/app'
import Head from 'next/head'
import React from 'react'
export default class MyApp extends App {
static async getInitialProps ({ Component, router, ctx }) {
let pageProps = {}
if (Component.getInitialProps) {
pageProps = await Component.getInitialProps(ctx)
}
return {pageProps}
}
render () {
const {Component, pageProps} = this.props
return <Container>
<Head>
<title>My new cool app</title>
</Head>
<Component {...pageProps} />
</Container>
}
}
```
### Useful Links
- [The issue this was reported in: #4596](https://github.com/zeit/next.js/issues/4596)