class-validator is a TypeScript class validation library that uses decorators to define constraints and rules for object properties. It functions as a decorator-based schema validator that ensures data integrity and structural correctness through a combination of synchronous checks and promise-based asynchronous rules. The library provides a recursive validation system for checking complex data hierarchies, including nested classes and individual elements within collections. It includes an object property whitelist utility capable of stripping undocumented properties or blocking unknown field
ozzo-validation is a programmable data validation library for Go that verifies structs, maps, and primitive types using a declarative, rule-based approach. It functions as an interface-based validator, allowing for the recursive checking of nested data structures and custom types without the use of struct tags. The framework distinguishes itself as a context-aware validation engine, supporting the propagation of request-scoped data to rules that depend on external state. It provides extensive extensibility through custom rule definitions and the ability to override default failure text with l
This library is a declarative validation framework for Rust that enforces data integrity and business rules on structured data models. It utilizes procedural macros to transform attribute-based annotations into executable validation logic, ensuring that data structures adhere to defined constraints before processing. The framework distinguishes itself by performing validation at compile time, which eliminates runtime overhead and provides strict type checking for all rules. It supports recursive traversal of nested data structures and collections, ensuring that every level of a hierarchy is v
Hibernate Validator is a reference implementation of the Jakarta Validation specification, serving as a framework for enforcing data integrity across Java applications. It functions as a declarative validation engine that processes object constraints to ensure that application state remains consistent. By utilizing metadata-driven rules, the library validates object properties, method parameters, and nested collections to maintain data standards throughout an application's layers. The library distinguishes itself through its ability to perform static analysis on validation configurations, ide