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 […]
TypeScript is a superset of JavaScript. Any JavaScript code is a valid TypeScript code, as long we set the compiler not to be strict. Therefore, TypeScript aims to be as flexible as possible so that it can apply to various situations. In this article, we look into type compatibility in TypeScript and explain what a […]
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 […]
Branches are the bread and butter of a software developer using a Version Control System (VCS) of any kind. Today we explore how they work in Git. In the previous part of this series, we’ve learned that a commit is a full snapshot of the project state. In Git, the branch is a pointer to a […]