Validating data with pipes and guards

Pipes and guards are like the keen-eyed bouncers at a prestigious club, ensuring every guest (all data, in our case) meets the requisite criteria before entry.

Pipes – transforming and validating

Pipes operate in two main capacities: data transformation and data validation. By chaining multiple pipes, you can ensure data integrity and uniformity across your application.

See the following for a brief overview:

import {
  PipeTransform,
  Injectable,
  ArgumentMetadata
} from '@nestjs/common';
@Injectable()
export class SamplePipe implements PipeTransform {
  transform(value: any, metadata: ArgumentMetadata) {
    // Validation or transformation logic here
    return transformedValue;
  }
}

We can break this code down as follows:

• Imports:
  • The PipeTransform instance is a contract that our custom pipes will adhere to.
  • The Injectable...