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)

Testing the endpoints

In this section, we're going to be testing our /mine endpoint, along with our /transaction and /blockchain endpoints, to make sure that everything works well together.

Before we test, it would be a good idea to take out the console.log statement in the proofOfWork method. This is because having it will just make your program work harder, and it will therefore take more time to calculate things.

/mine endpoint testing

First, let's test the /mine endpoint that we just built in our last section. Let's head over to our browser and hit localhost:3000/blockchain:

Right now, we have our entire blockchain, in which the chain has one block in it our genesis block – and we...