Testing our application can increase our confidence when it comes to creating a fully-functional API. In this article, we look into how we can test our application by writing unit tests. We do so by using some of the utilities built into NestJS, as well as the Jest library. If you would like to get […]
When we build an application, we create many entities. They often somehow relate to each other, and defining such relationships is an essential part of designing a database. In this article, we go through what is a relationship in the context of a Postgres database and how do we work with them using TypeORM and […]
Express JavaScript NestJS TypeScript
NestJS strives to focus on the maintainability and testability of the code. To do so, it implements various mechanisms such as the Dependency Injection. In this article, we inspect how NestJS can resolve dependencies by looking into the output of the TypeScript compiler. We also strive to understand the modular architecture that NestJS is built […]
Sometimes we need to perform additional operations on the outcoming data. We might not want to expose specific properties or modify the response in some other way. In this article, we look into various solutions NestJS provides us with to change the data we send in the response. You can find the code from this […]
NestJS shines when it comes to handling errors and validating data. A lot of that is thanks to using decorators. In this article, we go through features that NestJS provides us with, such as Exception filters and Validation pipes. The code from this series results in this repository. It aims to be an extended version of […]
Authentication is a crucial part of almost every web application. There are many ways to approach it, and we’ve handled it manually in our TypeScript Express series. This time we look into the passport, which is the most popular Node.js authentication library. We also register users and make their passwords secure by hashing. You can find all […]
The next important thing when learning how to create an API is how to store the data. In this article, we look into how to do so with PostgreSQL and NestJS. To make the managing of a database more convenient, we use an Object-relational mapping (ORM) tool called TypeORM. To have an even better understanding, we also look […]
NestJS is a framework for building Node.js applications. It is somewhat opinionated and forces us to follow its vision of how an application should look like to some extent. That might be viewed as a good thing that helps us to keep consistency across our application and forces us to follow good practices. NestJS uses Express.js […]
When we develop a REST API, we have a set of HTTP methods that we can choose. An important thing to understand is that HTTP methods are, to a large extent, indicators of actions. Therefore, it is our job to make them work properly. In theory, not much stops us, for example, from deleting entities with […]
Mongoose does quite a bit of heavy-lifting for us. It is immensely useful, but not necessary in every case. In this article, we explore the Mongoose documents more and learn what we can achieve by giving up their benefits. Mongoose Document In the second part of this series, we’ve created our first models. They allow […]