In the exercise files of this chapter, you will find two directories, that is, Final and Initial. Final contains the final source code of the project, whereas Initial contains the empty source code files and libraries to get started with building the application quickly.

In the Initial directory, you will find a public directory and two files named app.js and package.json. The package.json file contains the backend dependencies on our app. app.js is where you will place the backend source code.

The public directory contains files related to the frontend. Inside public/css, you will find bootstrap.min.css, which is the bootstrap library, and you will also find the codemirror.css file, which is CSS of the codemirror library. Inside public/html, you will find index.html, where you will place the HTML code of our app and in the public/js directory, you will find .js files for codemirror and web3.js. Inside public/js, you will also find a main.js file, where you will place the frontend JS code of our app.