What does validator mean?
A validator is someone or something that establishes whether a document, claim, piece of data, or digital object meets the rules required for acceptance. The word is especially common in computing, where a validator may check the syntax of a form, the conformity of data with a schema, the integrity of a file, or the authenticity of a digital certificate. A human validator can likewise serve as an official reviewer, examiner, or certifier. The term is generally formal and technical, although it can carry a mildly bureaucratic tone when used of an administrative approver. The distinction between a validator and a verifier is one of emphasis: a validator primarily tests something against criteria, while a verifier usually confirms that a particular claim, identity, or result is genuine. Understanding the word is useful because validators are widespread in both everyday institutional processes and the systems that regulate online activity.
nounA person, organization, program, or device that checks whether something is valid, especially by applying established rules or criteria. In computing, the term commonly refers to software that checks the format, integrity, or compliance of data, forms, or files.
- A person or authority responsible for checking and confirming that something meets specified requirements.
- A program, device, or software component that checks data, input, or digital material against defined rules or criteria.
"The form validator rejected the submission because the date field was incomplete."
"Independent validators reviewed the election returns before the results were certified."
"The certificate validator checks that each signature was issued by a trusted authority."
The standard plural of validator.
"Several validators reviewed the submitted research data."
A validator is a system’s gatekeeper: it decides whether a password, certificate, or submission has earned the right to pass through.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does validator come from?
Validator was formed from validate with the noun-forming suffix -or, indicating a person or agent that performs an action. Validate comes through French and Medieval Latin from Latin validus, meaning “strong” or “valid,” ultimately from valere, “to be strong” or “to be well.” The same Latin root accounts for cognates such as valid, validity, and valor, while validator itself developed as a modern English noun for an authority or mechanism that confirms validity.
Related word forms
How validator is actually used
The term is formal and neutral, but it can sound bureaucratic when applied to a person who routinely approves documents. In computing and cryptography, it usually denotes software or hardware that performs an automated check.
Easily confused with validator
A validator performs a check, whereas validity is the quality or condition of being valid.
A validator assesses whether something satisfies formal rules or criteria, while a verifier independently confirms the authenticity or accuracy of a claim.