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if (!parseResult.success) { return HttpResponse.badRequest(parseResult.error.issues); } // Validated DTO enters the application layer const result = await this.orderService.createOrder(parseResult.data); return result.match({ success: (order) => HttpResponse.created(order), failure: (error) => HttpResponse.unprocessableEntity(error) }); } } // APPLICATION LAYER: Orchestrates domain operations class OrderService { async createOrder(dto: CreateOrderDto): Promise> { // Application-level validation (authorization, resource existence) const customer = await this.customerRepo.findById(dto.customerId); if (!customer) { return Result.failure(OrderError.customerNotFound(dto.customerId)); } // Delegate to domain for business validation return this.orderFactory.create(customer, dto.items); } } // DOMAIN LAYER: Business rule validation in Value Objects class Money { private constructor( private readonly amount: number, private readonly currency: Currency ) {} static create(amount: number, currency: Currency): Result { // Semantic validation: amounts must be non-negative if (amount < 0) { return Result.failure(ValidationError.negativeAmount(amount)); 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type CreateUserDto = z.infer; // PATTERN 2: Specification Pattern for Business Rules interface Specification { isSatisfiedBy(candidate: T): boolean; and(other: Specification): Specification; or(other: Specification): Specification; not(): Specification; } class OrderValueSpecification implements Specification { constructor(private readonly minValue: Money) {} isSatisfiedBy(order: Order): boolean { return order.totalValue.isGreaterThanOrEqual(this.minValue); } and(other: Specification): Specification { return new AndSpecification(this, other); } // ... or, not implementations } // Compose complex business rules const eligibleForFreeShipping = new OrderValueSpecification(Money.dollars(50)) .and(new CustomerTierSpecification(CustomerTier.Gold)) .or(new PromotionActiveSpecification("FREE_SHIP_2024")); // PATTERN 3: Validation Result Pattern (accumulating errors) class ValidationResult { private constructor( private readonly errors: ValidationError[] ) {} static valid(): ValidationResult { return new ValidationResult([]); } static invalid(...errors: ValidationError[]): ValidationResult { return new ValidationResult(errors); } combine(other: ValidationResult): ValidationResult { return new ValidationResult([...this.errors, ...other.errors]); } get isValid(): boolean { return this.errors.length === 0; } get allErrors(): ValidationError[] { return [...this.errors]; } } // Usage: Accumulate all errors for user feedback function validateUserProfile(data: UserProfileData): ValidationResult { return ValidationResult.valid() .combine(validateEmail(data.email)) .combine(validatePhoneNumber(data.phone)) .combine(validateAddress(data.address)) .combine(validateDateOfBirth(data.dateOfBirth)); }74:T78c,// SECURE: Allowlist validation for file uploads const ALLOWED_EXTENSIONS = new Set(['.jpg', '.jpeg', '.png', '.gif', '.webp']); const ALLOWED_MIME_TYPES = new Set([ 'image/jpeg', 'image/png', 'image/gif', 'image/webp' ]); function validateFileUpload(file: UploadedFile): Result { // Validate extension (case-insensitive) const ext = path.extname(file.originalName).toLowerCase(); if (!ALLOWED_EXTENSIONS.has(ext)) { return Result.failure(SecurityError.invalidFileType(ext)); } // Validate MIME type from actual file content, not headers const detectedMime = detectMimeType(file.buffer); if (!ALLOWED_MIME_TYPES.has(detectedMime)) { return Result.failure(SecurityError.mimeTypeMismatch(detectedMime)); } // Validate file size if (file.size > MAX_FILE_SIZE) { return Result.failure(SecurityError.fileTooLarge(file.size)); } // Validate filename doesn't contain path traversal if (file.originalName.includes('..') || file.originalName.includes('/')) { return Result.failure(SecurityError.pathTraversal()); } return Result.success(); } // SECURE: Path validation preventing directory traversal class SecureFileAccess { constructor(private readonly baseDirectory: string) { // Ensure base directory is absolute and canonical this.baseDirectory = path.resolve(baseDirectory); } getFilePath(userProvidedPath: string): Result { // Resolve to absolute path const requestedPath = path.resolve(this.baseDirectory, userProvidedPath); // Verify it's still within base directory (canonical path comparison) if (!requestedPath.startsWith(this.baseDirectory + path.sep)) { return Result.failure(SecurityError.pathTraversal()); } return Result.success(requestedPath); } }75:Ta0c,// Composable Validator Interface interface Validator { validate(value: T): Result; } // Validator Combinators class Validators { // Combine validators, collecting all errors static all(...validators: Validator[]): Validator { return { validate(value: T): Result { const errors: ValidationError[] = []; for (const validator of validators) { const result = validator.validate(value); if (result.isFailure) { errors.push(...result.error); } } return errors.length > 0 ? Result.failure(errors) : Result.success(value); } }; } // Chain validators, stopping on first failure static chain(...validators: Validator[]): Validator { return { validate(value: T): Result { for (const validator of validators) { const result = validator.validate(value); if (result.isFailure) { return result; } } return Result.success(value); } }; } // Conditional validator static when( condition: (value: T) => boolean, validator: Validator ): Validator { return { validate(value: T): Result { if (condition(value)) { return validator.validate(value); } return Result.success(value); } }; } } // Reusable primitive validators const nonEmpty = (field: string): Validator => ({ validate: (value) => value.trim().length > 0 ? Result.success(value) : Result.failure([ValidationError.required(field)]) }); const maxLength = (max: number, field: string): Validator => ({ validate: (value) => value.length <= max ? 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This includes type checking, format validation (email patterns, phone numbers), and encoding verification. Syntactic validation answers: *Is this input well-formed?*\n\n**Semantic Validation** ensures input values make sense within the domain context. A syntactically valid date like '2024-02-30' fails semantic validation because February never has 30 days. Semantic validation answers: *Does this input make sense?*\n\n**Business Rule Validation** confirms input satisfies domain-specific constraints. An order quantity of 1000 might be syntactically and semantically valid but violate business rules limiting orders to 100 units. 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Comprehensive validation addresses all categories systematically.","variant":"warning"},"type":"callout"}],"titleType":"number","titleNumber":1},{"id":"validation-location","title":"Where Validation Should Live","content":[{"data":{"content":"One of the most contentious architectural decisions is **where** validation logic belongs. The answer isn't singular—different validation types belong at different layers, and some validation must occur at multiple points.\n\n**The Boundary Principle:** Validate all external input at system boundaries before it enters your domain. This includes API endpoints, message queue consumers, file upload handlers, and configuration loaders. Boundary validation prevents malformed data from propagating into system internals.\n\n**The Domain Principle:** Business rules and semantic validation belong in the domain layer. Value Objects should enforce their own invariants. Entities should validate state transitions. This ensures domain integrity regardless of how data enters the system.\n\n**The Defense-in-Depth Principle:** Critical validations should occur at multiple layers. Don't trust that upstream validation occurred correctly. This redundancy protects against bugs, refactoring errors, and security vulnerabilities."},"type":"text"},{"data":{"fileName":"layered-validation.ts","languages":[{"code":"$72","label":"TypeScript","value":"typescript"}]},"type":"code"}],"titleType":"number","titleNumber":2},{"id":"validation-patterns","title":"Validation Patterns and Techniques","content":[{"data":{"content":"Effective validation requires choosing appropriate patterns for different scenarios. Each pattern has distinct characteristics suited to specific use cases."},"type":"text"},{"data":{"items":["**Schema Validation** — Declarative validation using schemas (JSON Schema, Zod, Yup). Excellent for API boundaries where you need clear, documentable contracts. Schemas generate both validation logic and TypeScript types.","**Specification Pattern** — Encapsulates business rules as composable objects. Rules can be combined with AND/OR logic, enabling complex validation scenarios. Ideal for configurable business rules.","**Value Objects** — Enforce invariants at construction time. An `EmailAddress` type that can only contain valid emails eliminates scattered validation checks. The type system becomes your validation system.","**Validation Result Pattern** — Accumulates all validation errors rather than failing on the first. Essential for user-facing forms where users need complete feedback, not iterative error discovery.","**Pipeline/Chain Validation** — Sequences validators, passing results through transformations. Each step can validate and transform, enabling complex multi-stage validation workflows."],"title":{"icon":"Target","text":"Core Validation Patterns","type":"icon","color":"primary","variant":"outline-circle"},"variant":"accent"},"type":"list"},{"data":{"fileName":"validation-patterns.ts","languages":[{"code":"$73","label":"TypeScript","value":"typescript"}]},"type":"code"}],"titleType":"number","titleNumber":3},{"id":"security-validation","title":"Security-Focused Validation","content":[{"data":{"content":"Security validation requires a fundamentally different mindset: **assume all input is malicious**. Attackers craft inputs specifically designed to bypass validation and exploit system vulnerabilities."},"type":"text"},{"data":{"rows":[["SQL Injection","Malicious SQL in user input","Parameterized queries, input sanitization, allowlists"],["XSS","Script injection in output","Output encoding, Content Security Policy, sanitization"],["Path Traversal","Access files outside intended directory","Canonical path validation, allowlist directories"],["Command Injection","OS commands in input","Never construct commands from input, strict allowlists"],["Integer Overflow","Values exceeding type bounds","Range validation before arithmetic, safe math libraries"],["Deserialization","Malicious serialized objects","Type allowlists, avoid deserializing untrusted data"]],"caption":"Common Attack Vectors and Defenses","headers":["Attack","Description","Validation Defense"]},"type":"table"},{"data":{"icon":"AlertCircle","title":"The Allowlist Principle","content":"Always validate against allowlists (what IS permitted), never blocklists (what IS NOT permitted). Blocklists inevitably miss attack vectors. If you expect a color, validate against ['red', 'green', 'blue']—don't try to block every possible malicious string.","variant":"error"},"type":"callout"},{"data":{"fileName":"security-validation.ts","languages":[{"code":"$74","label":"TypeScript","value":"typescript"}]},"type":"code"}],"titleType":"number","titleNumber":4},{"id":"composable-validation","title":"Composable Validation Architecture","content":[{"data":{"content":"Production systems require validation logic that is **composable**, **reusable**, and **testable**. This demands treating validators as first-class architectural components rather than scattered conditionals."},"type":"text"},{"data":{"fileName":"composable-validators.ts","languages":[{"code":"$75","label":"TypeScript","value":"typescript"}]},"type":"code"}],"titleType":"number","titleNumber":5},{"id":"summary","title":"Summary: Input Validation Strategies","content":[{"data":{"type":"ordered","items":["**Validation is multi-dimensional** — Syntactic, semantic, business, and security validation each require distinct strategies and belong at different architectural layers.","**Validate at boundaries, enforce in domain** — External input validation at system edges, business rules enforced within domain objects and Value Objects.","**Choose appropriate patterns** — Schema validation for APIs, Specification pattern for complex rules, Value Objects for domain invariants, Result pattern for user feedback.","**Security requires allowlists** — Always validate against what IS permitted, never try to block what IS NOT. Assume all input is potentially malicious.","**Build composable validators** — Treat validators as first-class components that can be combined, tested, and reused across the system."],"title":{"icon":"CheckCircle","text":"Key Takeaways","type":"icon","color":"primary","variant":"outline-circle"},"variant":"accent"},"type":"list"},{"data":{"icon":"CheckCircle","title":"Page Complete","content":"You now understand the comprehensive landscape of input validation strategies. 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