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Replace repetitive request validation in NestJS by using ValidationPipe with class‑validator decorators. Learn how to set it up globally, create DTOs, add async custom validators, and understand trade‑offs.
C# records provide value equality and init-only properties that make them suitable for DTOs and domain models at trust boundaries. This architecture note covers the minimal design, validation patterns, shallow immutability limits, and when to switch to entity semantics.
Learn how PHP 8.1+ readonly properties and PHP 8.2+ readonly classes enforce immutability in value objects and DTOs. See a concrete UserId example, trade-offs, and a quick adoption checklist.
Learn how to use NestJS ValidationPipe to eliminate payload pollution and manual type checking using declarative DTOs and class-validator.
Java records reduce boilerplate for immutable data carriers, but their validation does not run during deserialization, requiring explicit trust boundaries and operational checks.
Learn how to replace verbose POJOs with Java Records to eliminate boilerplate, ensure immutability, and implement safe data carriers in Java 16+.
Records reduce boilerplate for immutable DTOs and value objects by generating value-based equality. Learn how positional records work, where shallow equality bites, and how to verify the behavior.
Immutable DTOs in PHP 8.x let you enforce read‑only state with a few lines of code. Learn how readonly properties, constructor promotion, and shallow immutability work together to keep data safe across your application.
Learn how to use Java Records as minimal, immutable DTOs for cross-service communication, including strategies for validation, defensive copying, and avoiding binary compatibility issues.
nestjs
csharp
php
java