How to include JWT authentication in the middleware

I'm trying to include JWT ( http://jwt.io/ ) token authentication in the boilerplate.
Let's pretend for a second that the autentication process serverside is already there.
What I do is calling API/login passing username and password and I return a token. From that point on, I'd like the middleware to attach this to every http calls.

```
headers: {
'Authorization': `Bearer *TOKEN* `
}
```

Where _TOKEN_ is this.store.token variable defined in the redux auth.js.

How can I do that ?