Systems | Development | Analytics | API | Testing

JSON Web Tokens (JWTs) secure communication between parties over the internet by authenticating users and transmitting information securely, without requiring a centralized storage system. In this article, we'll explain what JWTs are and give a high-level overview of how they work. We'll also implement a JWT-based authentication system by creating a to-do list API using Flask.

Increasing the test coverage of a backend application is key to ensuring its reliability, functionality, and robustness. Thanks to its intuitive API and agnostic approach to assertions, Mocha has emerged as one of the most popular choices for unit testing in Node.js. In this guide, you'll learn what Mocha is, understand how it works, explore its features, and see it in action with a complete example. Time to become a Mocha unit testing expert!

Authentication is a critical element of any web application. The Ruby on Rails ecosystem has no shortage of solutions for this topic, as no authentication layer has been backed into the framework yet. Devise is a crowd favorite. Although it has ended up as the de-facto standard and sports many built-in features and great plugins (such as integrations with NoSQL databases, encryption, roles, and UID support), it works as a separate entity from your application.

Webpack has long been the dominant player in the JavaScript web bundler landscape. Over time, many competitors have gradually entered the arena, each offering unique features and improved performance. Among these newcomers, Rspack stands out with its innovative approach to web application bundling. Leveraging a Rust core, it provides high-speed, multithreaded code splitting.

Using AppSignal, you can monitor the performance of your Redis calls and get insights into how your application uses Redis. The AppSignal Python agent supports instrumenting Redis calls out of the box, so you can start monitoring your usage with just a few lines of code. In this post, we will cover how to instrument Redis in a Python application using AppSignal. We will build a simple URL shortener that stores data in a local Redis instance and uses AppSignal to monitor performance.

So, you've built a Flask application — congratulations! You've crafted routes, connected databases, and perhaps even deployed it to a server. But have you tested it thoroughly? Testing isn't just a checkbox on a developer's to-do list: it's an essential part of building robust and reliable applications. So, in this article, we'll describe why testing is important for Flask applications and how you can effectively implement tests.

In our previous post, we covered the basics of setting up and using Dialyzer in your Elixir project. Now, let's dive deeper into advanced type specifications, complex warning patterns, and troubleshooting techniques that will help you make the most of Dialyzer.