#dto code explainers

java

public class Views {
    public interface Public {}
    public interface Internal extends Public {}
}

Filtering JSON fields with @JsonView in Spring

serialization json-view access-control

Intermediate 6 steps

typescript

import {
  IsEmail,
  IsNotEmpty,
  IsOptional,

How validation groups reuse one DTO in NestJS

validation dto decorators

Intermediate 9 steps

typescript

import {
  Injectable,
  PipeTransform,
  ArgumentMetadata,

A custom validation pipe in NestJS

validation dto recursion

Intermediate 10 steps

typescript

import { NestFactory } from '@nestjs/core';
import { DocumentBuilder, SwaggerModule } from '@nestjs/swagger';
import { ValidationPipe } from '@nestjs/common';
import { ApiProperty } from '@nestjs/swagger';

Wiring validation and Swagger docs in NestJS

validation openapi decorators

Intermediate 8 steps

typescript

import { Exclude, Expose, Transform, Type } from 'class-transformer';
 
export class AddressEntity {
  street: string;

Shaping API responses with class-transformer in NestJS

serialization decorators dto

Intermediate 10 steps

typescript

import { IsInt, IsOptional, Max, Min } from 'class-validator';
import { Type } from 'class-transformer';
 
export class PaginationQueryDto {

Type-safe pagination queries in NestJS

pagination validation dto

Intermediate 7 steps