nestjs-validation-and-pipes

Validate incoming requests in NestJS by configuring a global ValidationPipe with class-validator and DTOs. The pipe enforces payload shapes, strips unknown properties, transforms data to DTO instances, and returns structured error responses automatically across all endpoints.

Secure your NestJS API by implementing a global ValidationPipe with whitelist: true, forbidNonWhitelisted: true, and transform: true. This rejects unknown fields, enforces DTO contracts, sanitizes payloads, and prevents malformed requests from reaching your business logic.

Transform query and parameter data in NestJS using DTOs with class-transformer and enableImplicitConversion: true in your global ValidationPipe. This automatically coerces string inputs to their correct types and normalizes parameters before handlers receive them.

Yes, NestJS supports custom pipes for specialized validation beyond DTOs. Build custom pipes to parse IDs, coerce strings, or enforce domain-specific rules while keeping controllers focused on business logic and separating concerns.

DTOs with validation in NestJS provide type safety, enforce data contracts at the API boundary, enable automatic transformation and sanitization, and generate consistent error responses. This prevents invalid data from entering your application and reduces security vulnerabilities.

NestJS ValidationPipe automatically generates structured error responses for invalid requests. Configure the pipe to reject non-whitelisted fields and return detailed validation messages, ensuring clients receive clear feedback without custom error handling logic.