Nest.js is to JavaScript what Spring is to Java, that is, it provides mechanisms for creating controllers. It then uses decorators - to denote methods that support specific methods, e.g. @Get, @Post, etc., and to denote the controllers themselves by means of decorators. It then uses decorators - to mark the methods that support specific methods, e.g. @Get, @Post etc., and to mark the controllers themselves with the @Controller() decorator (the parameter of this decorator is the path to the resource). For the service classes that will be injected, we in turn add the @Injectable decorator.
We also have a tool for creating an initial project and its individual components (module, controller, service and many others).
The framework benefits from other libraries and frameworks. Under the hood we will find express js as a http server by default. Optionally, you can use another engine - the architecture theoretically allows you to plug in any http server.
A popular passport js framework is used for authentication. When using the standard user/password method for this purpose, its use comes down to writing a service
and implementing a single method.
Also included is a database client along with mapping relationships to objects - the typeorm library is used here. If someone uses MongoDb, they will also find Mongoose on board.
The framework integrates several other libraries and provides mechanisms to implement many different scenarios (such as microservices or graphql). It is very well documented. The official documentation page presents every aspect of this library in detail, along with examples. The entry threshold is very low, especially if you already have experience with the technologies mentioned at the very beginning.
I think that this is a very successful project, which takes a comprehensive approach to backend development using many proven solutions. Its popularity and maturity is confirmed by the fact that on github at the time of writing these words the project has 23 thousand stars. If you are considering developing a web application on the node.js platform, this is a very good starting point.
