To test if the application is running, use the following command line on the project folder, which will open the localhost:
npm start
If all the variables such as AccountId, Private Key, and endpoint URL are configured, you should see a working app on localhost 5000, as shown in the following screenshot:
![](https://static.packt-cdn.com/products/9781787126893/graphics/assets/bf8573ac-c4d6-4074-8f3c-d0555e07235f.png)