Book Image

Learn Blockchain Programming with JavaScript

By : Eric Traub
Book Image

Learn Blockchain Programming with JavaScript

By: Eric Traub

Overview of this book

Learn Blockchain Programming with JavaScript begins by giving you a clear understanding of what blockchain technology is. You’ll then set up an environment to build your very own blockchain and you’ll add various functionalities to it. By adding functionalities to your blockchain such as the ability to mine new blocks, create transactions, and secure your blockchain through a proof-of-work you’ll gain an in-depth understanding of how blockchain technology functions. As you make your way through the chapters, you’ll learn how to build an API server to interact with your blockchain and how to host your blockchain on a decentralized network. You’ll also build a consensus algorithm and use it to verify data and keep the entire blockchain network synchronized. In the concluding chapters, you’ll finish building your blockchain prototype and gain a thorough understanding of why blockchain technology is so secure and valuable. By the end of this book, you'll understand how decentralized blockchain networks function and why decentralization is such an important feature for securing a blockchain.
Table of Contents (10 chapters)

Refactoring the /transaction endpoint

We're going to refactor the /transaction endpoint in this section, so that it works perfectly with the new /transaction/broadcast endpoint. Let's apply the following steps to modify the endpoint:

  1. To get started, go to the dev/networkNode.js file and delete everything that is in the /transaction endpoint. The only time the /transaction endpoint will be hit is when the broadcast takes place. When the /transaction endpoint is being hit, the newTransaction variable will be sent as data. This condition can be defined as follows:'/transaction', function(req, res) {
const newTransaction = req.body;


In the preceding highlighted line, the newTransaction variable is sent to the /transaction endpoint with the help of req.body.

  1. Next, add the new transaction to the pendingTransactions array of whichever node receives...