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)

Building the /register-and-broadcast-node endpoint

Let's start building our register and broadcast node endpoint. The function of this endpoint will be to register the new node with itself and then broadcast the new node to all the other nodes that are already present in the network. So, let's get started with building the endpoint:

  1. From the preceding sections, in the dev/networkNode.js file, we already have the following code:'/register-and-broadcast-node', function(req, res) {
const newNodeUrl = req.body.newNodeUrl;

Here, we defined a variable called newNodeUrl, and this newNodeUrl data will be passed onto the request body, similar to how we have transaction data being passed into the transaction endpoint. With access to the newNodeUrl, the first thing that we want to do is register the node with the node's register-and-broadcast...