# Create groups tutorial continued

## Create your app.js file

Create a file called **app.js** in the root folder of your Node.js app. This
file will configure your app to utilize Express, parse a JSON body, and send requests.


```javascript
// add requirements
var express = require("express");
var router = require("./routes/sinch.js");

//set up an app
var app = express();
//configure on what port express will create your app
var port = process.env.PORT || 5000;

//add the sinch route
app.use("/sinch.js", router);

//add default content type for all requests
app.use(function (req, res, next) {
  res.setHeader("Content-Type", "application/json");
  next();
});
//export and start listening
module.exports = app;
app.listen(port);
```

Let's set up routes ->
[Go Back](/docs/sms/tutorials/node/create-groups/next_2)