Group-Based Serialization

Group-based serialization in NestJS is a powerful technique for controlling the data exposed in API responses based on custom-assigned groups. This approach provides a fine-grained mechanism to control which properties should be exposed, enhancing the security and efficiency of the API.

In this lesson, we’ll explore how to implement group-based serialization using the @Expose decorator from the class-transformer library.

A group is a logical grouping of properties within a class. Each group is assigned a name, and properties can be associated with one or more groups.

We can achieve group-based serialization by using the class-transformer library, along with the built-in @Expose() decorator.

Dependencies

First, make sure we have the class-transformer and class-validator packages installed using the following command: