next.js/examples/with-cookie-auth/README.md

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# Example app utilizing cookie-based authentication

## How to use

### Using `create-next-app`

Download [`create-next-app`](https://github.com/segmentio/create-next-app) to bootstrap the example:

```
npm i -g create-next-app
create-next-app --example with-cookie-auth with-cookie-auth-app
```

### Download manually

Download the example [or clone the repo](https://github.com/zeit/next.js):

```bash
curl https://codeload.github.com/zeit/next.js/tar.gz/canary | tar -xz --strip=2 next.js-canary/examples/with-cookie-auth
cd with-cookie-auth
```

Install it and run:

```bash
npm install
npm run dev
```

Deploy it to the cloud with [now](https://zeit.co/now) ([download](https://zeit.co/download))

```bash
now
```

## The idea behind the example

In this example, we authenticate users and store a token in a cookie. The example only shows how the user session works, keeping a user logged in between pages.

This example is backend agnostic and uses [isomorphic-unfetch](https://www.npmjs.com/package/isomorphic-unfetch) to do the API calls on the client and the server.

The repo includes a minimal passwordless backend built with [Micro](https://www.npmjs.com/package/micro) and it logs the user in with a GitHub username and saves the user id from the API call as token. 

Session is syncronized across tabs. If you logout your session gets logged out on all the windows as well. We use the HOC `withAuthSync` for this.

The helper function `auth` helps to retrieve the token across pages and redirects the user if no token was found.