Book Image

Building Enterprise JavaScript Applications

By : Daniel Li
Book Image

Building Enterprise JavaScript Applications

By: Daniel Li

Overview of this book

With the over-abundance of tools in the JavaScript ecosystem, it's easy to feel lost. Build tools, package managers, loaders, bundlers, linters, compilers, transpilers, typecheckers - how do you make sense of it all? In this book, we will build a simple API and React application from scratch. We begin by setting up our development environment using Git, yarn, Babel, and ESLint. Then, we will use Express, Elasticsearch and JSON Web Tokens (JWTs) to build a stateless API service. For the front-end, we will use React, Redux, and Webpack. A central theme in the book is maintaining code quality. As such, we will enforce a Test-Driven Development (TDD) process using Selenium, Cucumber, Mocha, Sinon, and Istanbul. As we progress through the book, the focus will shift towards automation and infrastructure. You will learn to work with Continuous Integration (CI) servers like Jenkins, deploying services inside Docker containers, and run them on Kubernetes. By following this book, you would gain the skills needed to build robust, production-ready applications.
Table of Contents (26 chapters)
Title Page
Copyright and Credits
Packt Upsell
Free Chapter
The Importance of Good Code

Running our API on port 80

We are currently running our API server on port 8080, whereas the standard port for HTTP requests is port 80. It would be really inconvenient, and thus bad for user experience, to ask the consumers of our API to attach a port number to the URL for every request.

Therefore, let's change the port that Express is listening on from 8080 to 80 and see what happens. Change the SERVER_PORT environment variable to 80:


Then, stop and delete the PM2 application, and run the serve script again. When we run it again, it will initially be successful:

hobnob@hobnob:$ npx pm2 delete 0; yarn run serve
[PM2] Done.
│ Name  │ mode │ status │ ↺ │ cpu │ memory  │
│ index │ fork │ online │ 0 │ 0%  │ 16.9 MB │

However, when we check its status again, PM2 will show you that the application has errored, and it has tried to restart it 15...