The file system module in Node.js provides all file-related functions. Access file details with the help of a so called “stats” instance. {{outline}} Created Date of a File Use the fs module in Node.js to retrieve a stats instance of a given file including meta data like the …

The previous tutorials on basic JWT logout and immediate JWT logout focused on the functionality to invalidate tokens. They didn’t focus on project architecture, clean code, or where to apply actions. That’s what you’ll change in this tutorial: refactor your code to find a better place to …

Working with dates and times in JavaScript can be cumbersome. The Date class provides methods to interact with dates and times. Usually, you need to put more effort into calculating the value that you’re interested in. In various situations, it’s favorable to calculate the seconds since epoch in …

The first tutorial on JWT logout shows you a basic logout when using JSON web token (JWT). The downside of this logout is that users can authenticate requests for the remaining JWT lifetime. Only the refresh token is revoked. In contrast to the first tutorial, you’ll now implement a …

When working on a new feature or app idea, storing data on the file system can be a good solution. You can skip the database setup and save JSON to a file instead. {{outline}} Write JSON to File JavaScript comes with the JSON class that lets you serialize an object …

Authenticating users in web applications or APIs has different approaches. Invalidating a user’s server-side session or an authentication-related cookie is in your full control. With JSON web tokens (JWTs), you need to extend your platform with a custom logout handling ensuring to invalidate an active JWT. Because there’s …

Using streams in Node.js is a powerful mechanism to process data. Especially when working with large data sets where you might want to filter chunks that don’t match a given criteria. {{outline}} Example: Loading Lines From File to Database Imagine the following example: you want to load a …

JSON Web Token (JWT) authentication comes with a trade-off: the created token lives on client side. You don’t need to store a token in your server-side database to make JWT authentication work in your application. This is —simultaneously— the largest benefit of JWT: your server can trust a verified …