typestack/class-validator

Features

• Data Validation - Ensures TypeScript class properties meet specific criteria using decorators to maintain data integrity and type safety.
• Class Property Validation - Checks that class properties meet specific criteria using decorators to ensure data integrity before processing.
• Property Whitelisting - Compares object keys against decorated class properties to strip or block non-whitelisted data.
• Asynchronous Validators - Supports promise-based asynchronous rules for verifying data against external sources or databases.
• Contextual Validation Groups - Assigns decorators to specific groups to apply different validation schemas to the same object in different contexts.
• Recursive Hierarchy Validation - Provides a recursive validation system for checking complex data hierarchies and individual elements within collections.
• Strict Schema Enforcers - Blocks objects containing properties not defined in the class to ensure strict adherence to the data schema.
• Asynchronous Validation - Wraps validation checks in promises to allow for network requests or database lookups before returning results.
• Schema Tree Traversers - Recursively walks through nested objects and collections to apply validation rules across deep data hierarchies.
• Custom Validation Rules - Allows defining reusable validation logic by implementing constraint interfaces and registering them globally.
• Nested Object Validation - Recursively checks properties that are instances of other decorated classes or multi-dimensional arrays.
• Recursive Object Validation - Implements a recursive validation system for verifying complex data hierarchies, including nested classes and collections.
• Decorator-Based Validation - Uses TypeScript decorators to define constraints and rules for object properties as metadata.
• Validation Grouping - Filters which validation constraints to run by matching active group names against metadata tags.
• Validation Libraries - Offers a comprehensive library of decorator-driven rules for verifying data integrity and structural correctness in TypeScript classes.
• Additional Property Filtering - Removes properties without decorators from an object or triggers errors when non-whitelisted properties are found.
• Metadata Collection - Uses TypeScript decorators to store validation constraints as metadata for runtime retrieval.
• Conditional Validation Rules - Allows skipping specific property checks based on boolean condition functions or property-level triggers.
• Conditional Enforcement - Supports applying specific sets of validation constraints based on active group tags for context-dependent schemas.
• Dependency-Injected Constraints - Enables providing external tools and data to custom validation constraint classes via a service container.
• Input Sanitization - Includes an object property whitelist utility to strip undocumented properties and prevent unknown fields from entering the system.
• Property Strictness - Provides a whitelist utility that ensures objects contain only specified keys by stripping or prohibiting extra properties.
• Array Schema Validation - Applies validation rules to every individual element within arrays, sets, or maps.
• Dependency Injection Containers - Integrates a service container to resolve custom validation logic and provide external dependencies to validators.
• Request Validation - Provides utilities to validate incoming request data against class-based schemas to ensure security and correctness.
• External Data Validation - Processes properties that return promises to allow for validation requiring external data or API calls.
• Data Validation - Decorator-based class property validation.

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