validador

Validador is a term used in Spanish and Portuguese to denote an entity that confirms the correctness, legitimacy, or compliance of something. In computing and information systems, a validator is a component or process that checks whether data, operations, or actions conform to defined rules or constraints.

In software development and data processing, validators perform input validation, ensuring that user-provided data meets type, range, format, and business rules. Examples include form validators, validation libraries, and schema validators (for JSON, XML, or relational constraints). They help prevent errors, security vulnerabilities, and inconsistent data. Validators can operate on the client side, server side, or as part of data pipelines.

In databases and data stores, validation mechanisms enforce integrity, such as constraints, checks, triggers, or domain-specific validators that enforce business logic before data is stored or processed.

In distributed systems and blockchain networks, a validator is a node or actor responsible for verifying transactions and proposing or signing blocks. In proof-of-stake networks, validators stake tokens to participate in consensus and must meet criteria related to uptime, stake, and security. Validator performance is monitored, and misbehavior may incur penalties.

In quality assurance and validation theory, validation refers to the process of confirming that a system, product, or service fulfills its intended use and requirements, distinct from verification, which checks that it was built correctly.