How can we ensure consistency between the models of our Spring Boot and Angular applications? Any other suggestions?

When working on client-server applications using spring-boot and angular, I often come across resources that explain the process of exposing REST endpoints in spring boot and consuming them in angular with an http client.

The usual approach involves communication in JSON format, requiring the maintenance of DTOs (DataTransferObjects) on both the angular and spring boot sides.

I am curious if those experienced in full-stack development are aware of any alternatives to avoid maintaining separate DTOs on both ends, such as sharing models between the front and backend of the application?

javaangulartypescriptspring-bootdto

Answer №1

Consider using Swagger as a valuable tool for this task.

You have the option to either take a code-first approach, which will create a swagger spec from your Java controllers & TOs, or a spec-first approach, which will generate your Java controllers & TOs from a swagger spec.

In both cases, you can utilize the swagger spec to produce a collection of TypeScript interfaces for the client side.

Answer №2

According to Pace, utilizing Swagger can greatly benefit your project. By combining this with comprehensive documentation for API endpoints, you can seamlessly synchronize object models between the frontend and backend. Simply utilize the Swagger file in either .json or .yaml format to generate services and object models on the frontend by leveraging ng-swagger-gen.

...
    "scripts": {
    ...
    "start": "ng-swagger-gen && ng serve",
    "build": "ng-swagger-gen && ng build -prod"
     ...
  },
...

Running any of these commands will update your object models. Any changes in object property names or types must be addressed promptly to avoid errors before proceeding.

Note that the services and object models generated are based on the Swagger file, so regular updates are essential.

PS: In a previous project, all backend code was automatically generated from the Swagger file, simplifying the process significantly.

Answer №3

Tackling this complex subject involves navigating two distinct technology stacks. To bridge the gap, I propose creating objects based on a shared data model.

Answer №4

While it may sound promising, in reality, it falls short. Simply maintaining DTOs is not sufficient. For example, if the API changes a String to a List, updating your TypeScript DTO from a string to a string[] is not enough. There is additional logic needed for handling lists of strings when manipulating strings. Personally, I don't see it as a hassle to keep both sides of the DTO updated. It's a small sacrifice for the sake of flexibility and cleaner code (you'll end up with different methods in different DTOs).

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