Category: NestJS

JavaScript NestJS TypeScript

API with NestJS #12. Introduction to Elasticsearch

This entry is part 12 of 13 in the API with NestJS

We can find some searching functionalities in a lot of web applications. While we might be fine when iterating through a small data set, the performance for more extensive databases can become an issue. Relational databases might prove to be relatively slow when searching through a lot of data. A solution to the above problem […]

Express JavaScript NestJS Testing TypeScript

API with NestJS #9. Testing services and controllers with integration tests

This entry is part 9 of 13 in the API with NestJS

In the previous part of this series, we’ve focused on unit tests. This time, we look into integration tests. In this article, we explain their principles and how they differ from unit tests. We write a few of them using Jest to test our services. We also look into the SuperTest library to test our controllers. […]

JavaScript NestJS TypeScript

API with NestJS #8. Writing unit tests

This entry is part 8 of 13 in the API with NestJS

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 […]

Express JavaScript NestJS TypeScript

API with NestJS #6. Looking into dependency injection and modules

This entry is part 6 of 13 in the API with NestJS

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 […]