JSON Web Tokens offer a simple and powerful way to generate tokens for APIs. These tokens carry a payload that is cryptographically signed. While the payload itself is not encrypted, the signature protects it again tampering. In their most common format, a "secret key" is used in the generation and verification of the signature. In this article I'm going to show you a less known mechanism to generate JWTs that have signatures that can be verified without having access to the secret key.

In this live webcast I explain how to prevent circular dependency errors in Python. Most of this presentation is a live coding session in which I refactor a single-file Flask application into a fully fleshed out structure with multiple packages and modules, demonstrating how I completely avoiding circular dependencies.

This is the twenty third and last installment of the Flask Mega-Tutorial series, in which I'm going to tell you how to extend microblog with an application programming interface (or API) that clients can use to work with the application in a more direct way than the traditional web browser workflow.

This is the twenty second installment of the Flask Mega-Tutorial series, in which I'm going to tell you how to create background jobs that run independently of the web server.

This is the twenty first installment of the Flask Mega-Tutorial series, in which I'm going to add a private message feature, along with user notifications that appear in the navigation bar without the need to refresh the page.

In this live webcast I explain what is the purpose of the request and application contexts in Flask, and why sometimes you get these weird errors about them.

This is the twentieth installment of the Flask Mega-Tutorial series, in which I'm going to add a nice popup when you hover your mouse over a user's nickname.

This is the nineteenth installment of the Flask Mega-Tutorial series, in which I'm going to deploy Microblog to the Docker container platform.

This is the eighteenth installment of the Flask Mega-Tutorial series, in which I'm going to deploy Microblog to the Heroku cloud platform.

This is the seventeenth installment of the Flask Mega-Tutorial series, in which I'm going to deploy Microblog to a Linux server.