To test the app, run the app.js node inside the Initial directory and visit localhost:8080. You will see what is shown in the following screenshot:
![](/api/v2/epubs/9781787122147/files/assets/image_06_001.png)
Now enter some solidity contract code and press the compile button. Then, you will be able to see new input boxes appearing on the right-hand side. For example, take a look at the following screenshot:
![](/api/v2/epubs/9781787122147/files/assets/image_06_002.png)
Now enter a valid address and its associated private key. And then enter values for the constructor arguments and click on deploy. If everything goes right, then you will see an alert box ...