NPM has large ecosystem of JavaScript modules. During development, you may add dependencies to your project and may not need them anymore at a later point. Using the NPM CLI to install dependencies will add the module to your project dependencies by adding it to your package.json file. In …

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 …