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 […]
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 […]
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 […]
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 […]
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 […]
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 […]
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 […]
As our application grows, more and more people start depending on it. At a time like this, it is crucial to ensure that our API works well. To do that, we could use a way to troubleshoot the application to detect anomalies and to be able to find their origin. This article serves as an […]
When we develop a REST API, there is a set of HTTP methods that we can choose from, such as GET, POST, and DELETE. A crucial thing to understand is that HTTP methods are largely conventional. It is our job to make them work in a way that’s consistent with the specification. For example, in […]
JavaScript MongoDB NestJS TypeScript
The bigger our database is, the more demanding our queries become in terms of computing power. A common way of tackling this problem is by creating indexes. In this article, we explore this concept and create indexes with MongoDB and Mongoose. When performing a MongoDB query, the database must scan every document in a given […]
