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next.js/examples/with-react-useragent/README.md

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[![Deploy to now](https://deploy.now.sh/static/button.svg)](https://deploy.now.sh/?repo=https://github.com/zeit/next.js/tree/master/examples/with-react-useragent)
# react-useragent example
Show how to setup [@quentin-sommer/react-useragent](https://github.com/quentin-sommer/react-useragent) using next.js client side and server side rendering.
## How to use
### Using `create-next-app`
Execute [`create-next-app`](https://github.com/segmentio/create-next-app) with [Yarn](https://yarnpkg.com/lang/en/docs/cli/create/) or [npx](https://github.com/zkat/npx#readme) to bootstrap the example:
```bash
npx create-next-app --example with-react-useragent with-react-useragent-app
# or
yarn create next-app --example with-react-useragent with-react-useragent-app
```
### Download manually
Download the example:
```bash
curl https://codeload.github.com/zeit/next.js/tar.gz/canary | tar -xz --strip=2 next.js-canary/examples/with-react-useragent
cd with-react-useragent
```
Install it
```bash
npm install
npm run dev
# or
yarn
yarn dev
```
## The idea behind the example
This example shows how to add user-agent awarness to your next.js app and set it up for server side rendering. It will enable you to directly detect the device from the server side.
You can then decide what to render depending on the device. For example:
- Smaller image for phones
- Dedicated download button fos iOS devices.
The example uses the `pages/_app.js` file to automatically injectuser-agent detection in all your pages.