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)

Defining the block explorer endpoints

In order for the block explorer to function correctly, we'll need to query the blockchain for addresses, block hashes, and transaction IDs so that we can search for a particular parameter and get that particular piece of data in return. Consequently, the first step that we'll need to carry out is to build a few more endpoints. To do this, lets proceed with the following steps:

  1. Go to the dev/networkNode.js file and after the /consensus endpoint, let's define the first endpoint of our block explorer, /block/:blockHash, as follows:
app.get('/block/:blockHash', function(req, res) { 


A specific blockHash will be sent with this endpoint, which, as a result, will simply return to us the block that the input of blockHash corresponds to.

  1. The next endpoint that we'll build will be /transaction/:transactionId....