You’re automatically using claims when using JWTs in your application. JWT Claims are an important piece in the JSON web token specification. Claims represent the data you’re storing inside the JWT. A JWT claim set is the JWT payload consisting of more than one key-value-pair. Imagine a JWT …

Serializing JavaScript to JSON is useful in various situations. Calling JSON.stringify(data) returns a JSON string of the given data. This JSON string doesn’t include any spaces or line breaks by default. It’s hard to read when writing the serialized JSON to a file. What you can …

String replacements are a common task in app development. JavaScript has powerful string methods and you intentionally think of string.replace() when reading the headline. Good catch, but there’s a trick to replacing all appearances when using it. Read on to get the details! {{outline}} String.replace(): One Appearance …

We ran into limitations with a third-party library providing the authentication schemes to authenticate requests with a refresh token. The problem: the used package happens to support the needed functionality, it’s not created with the intent to support it. In this tutorial, you’ll replace this package with your …

The file system module in Node.js provides all file-related functions. You can fetch file details with a so called “stats” instance. A part of the “stats” instance is a file’s last modified date. {{outline}} Last Modified Date of a File Retrieve a stats instance of a given file …

Security is a high-priority concern in every application. You should always look out for vulnerabilities in used libraries and your infrastructure. The same holds true for JWT because the token signing contains a hashing or encryption part. In this tutorial, you’ll learn how to switch the JWT signing algorithm, …

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 …