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 /transaction/broadcast endpoint

In this section, let's build a new endpoint called /transaction/broadcast. Anytime we want to create a new transaction from now on, we're going to hit this /transaction/broadcast endpoint. This endpoint will do two things:

  • It will create a new transaction.
  • It will then broadcast that new transaction to all the other nodes in the network.

Let's go through the following steps to create the endpoint:

  1. To add this endpoint, go to the dev/networkNode.js file where we have defined all the endpoints, and add this new endpoint as follows:
app.post('/transaction/broadcast', function(req, res) )  {

});
  1. Then, in order for the endpoint to carry out the aforementioned functionalities, add the following highlighted code to the endpoint:
app.post('/transaction/broadcast', function(req, res) )  {
const newTransaction...