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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-universal-configuration)
# With universal runtime configuration
## How to use
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### Using `create-next-app`
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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:
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```bash
npx create-next-app --example with-universal-configuration-runtime with-universal-configuration-runtime-app
# or
yarn create next-app --example with-universal-configuration-runtime with-universal-configuration-runtime-app
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```
### Download manually
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Download the example:
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```bash
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curl https://codeload.github.com/zeit/next.js/tar.gz/canary | tar -xz --strip=2 next.js-canary/examples/with-universal-configuration-runtime
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cd with-universal-configuration-runtime
```
Install it and run:
```bash
npm install
API_URL='https://example.com' npm run dev
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# or
yarn
API_URL='https://example.com' yarn dev
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```
Deploy it to the cloud with [now ](https://zeit.co/now ) ([download](https://zeit.co/download))
```bash
now
```
## The idea behind the example
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This example show how to set custom environment variables for your application at runtime using the `publicRuntimeConfig` key in `next.config.js`
For documentation see: https://github.com/zeit/next.js#exposing-configuration-to-the-server--client-side