In either case, it should be an identifier for a specific user. The piece of data that you hash in your token can be something either a user ID or username or a much more complex object. To bring this token into a Node.js file and to use it, you have to use dotenv:Īnd import it into your files like so: const dotenv = require ( 'dotenv' ) // get config varsĭotenv. To generate this secret, one option is to use Node.js’s built-in crypto library, like so: > require ( 'crypto' ). The token secret is a long random string used to encrypt and decrypt the data. To sign a token, you will need to have 3 pieces of information: You can add it to your JavaScript project by running the following command in your terminal:Īnd import it into your files like so: const jwt = require ( 'jsonwebtoken' ) Jsonwebtoken is an implementation of JSON Web Tokens.
Node.js installed locally, which you can do by following How to Install Node.js and Create a Local Development Environment.To follow along with this article, you will need the following installed on your machine: In this article, you will learn about the applications of JWTs in a server-client relationship using Node.js and vanilla JavaScript. Here's a pretty neat way to turn your middleware into a generic mechanism.Warning: Please be aware of the security risk of storing JWTs in localStorage. For sign up it might be Email, for sign-in it might be FullName, and for BuyItem it might be ItemId.
For different telemetry actions, we might want different fields. The above method works well enough (performance issues aside), but it's not very generic. Using dynamic properties from the request parameters Read more on that it in my article 8 Techniques to Avoid GC Pressure and Improve Performance in C#. Collections from higher generations are more expensive. The rule of thumb in healthy memory management is to have objects collected as fast as possible. This means more Gen 1 and Gen 2 collections, which means more execution time taken by the GC, and worse performance. When you keep the request body in memory for a longer time, there's a higher chance it will be promoted to a higher garbage collection generation. But there's also an impact on memory pressure. We're reading and deserializing the body's JSON twice, which is a waste. In our case, it's being read twice, so we have to call the EnableBuffering method and then rewind the stream to position 0. By default, the request body stream will be disposed as soon as it's read. The thing is, that in order to do that, you need to change the standard behavior of ASP.NET.
The above code reads the body directly from the HTTP request, deserializes it from JSON, and reads the email. One way to go about it is to call a method from within the action, like this: Suppose the SignUp and SignIn are two actions you're interested in. In other words, you want to report statistics of user actions. Let's say that you want to add telemetry to your ASP.NET controllers.
How do you pass data to the middleware for the telemetry or logging? What about dynamic data that you have during runtime? How to get values from the HTTP request? You're going to see how to do all that and more in this article. This makes the code looks great and separates concerns. If you're using ASP.NET Core, you can use attributes and the middleware system to add this kind of logic. There's no separation of concerns, it makes the business logic harder to read, and it's prone to bugs. While necessary, writing this code along with the business logic feels kind of wrong. This might be reporting telemetry, logging, or adding metrics. Every once in a while you need to add meta functionality without actually changing the business logic code.