We should be aware of whether our application is healthy. One way to do that would be to make various API requests to confirm it manually. It might not be the most elegant solution, though. The answer can be health checks. With them, we can verify if various aspects of our system work properly. Creating […]
The reality of software projects is that people sometimes come and go. Therefore, the bigger our application is, the higher value we put on the ability to more easily introduce new teammates into the codebase. One of the ways to improve this process is to create documentation. This way, we can accumulate knowledge even if […]
JavaScript NestJS SQL TypeScript
In this series, we’ve implemented deleting functionalities for various entities. So far, it has always meant removing records permanently from our database. Instead, we can perform soft deletes. When we delete a record using a soft delete, we only mark it as deleted. You can find the code from this series in this repository. Soft […]
JavaScript NestJS SQL TypeScript
In the previous parts of this series, we’ve learned how to upload files to Amazon S3 and store their metadata in our PostgreSQL database. While this is a highly scalable approach, it might be overkill for our application. A great example is storing users’ avatars. They are usually small and simple files, and we might […]
So far, in this series, we’ve described two ways of storing files on a server. In the 10th article, we’ve uploaded files to Amazon S3. While it is very scalable, we might not want to use cloud services such as AWS for various reasons. Therefore, in the 54th part of the series, we’ve learned how […]
So far, in this series, we’ve implemented authentication. By doing that, we can confirm that the users are who they claim to be. In this series, we explain how to implement authentication with JWT tokens or with server-side sessions. We also add two-factor authentication. While authorization might at first glance seem similar to authentication, it serves […]
Inheritance is one of the four pillars of object-oriented programming. JavaScript has the prototype-based inheritance, and with it, one object can acquire properties of another object. Even though JavaScript has the class keyword, it still uses prototypes under the hood. If you want to know to know more about prototypes, check out this article I wrote […]
We’ve introduced various ways of caching files on the server throughout this series. This article teaches how to help the browser perform caching on the client side. We use the entity tag (ETag) response header to do that. Imagine having a GET /user/[user-id]/avatar endpoint that responds with an image. The browser calls it every time we […]
Monorepo is an approach in which we store multiple projects in the same repository. It is common across big tech companies, such as Uber or Google. Even NestJS manages its source code in a monorepo with Lerna. When we store all of our code in a single repository, it might be easier to understand how different […]
Across this series, we emphasize code readability and maintainability. In part #52 of this course, we’ve gone through generating documentation with Compodoc and JSDoc. This time we look into the OpenAPI specification and the Swagger tool. You can check out an interactive demo prepared by the Swagger team. Introducing OpenAPI and Swagger With OpenAPI and […]
