What does "validate" mean in programming?

validate is one of the most common terms in software development. This guide explains what it means, how it is used in practice, and why it matters, with real examples from the developer world.

Definition

To check that a value, input, or data structure meets the expected format and constraints. Validation happens on both the client (for UX) and the server (for security).

Example

"if (!email.includes('@')) { throw new Error('Invalid email'); }"

Word forms

Form	Type	Meaning	Example
validate	verb (infinitive)	To check that data meets the expected rules or format	"Validate the email address before submitting the form."
validated	past tense	Checked that data met the expected rules	"The input was validated on both client and server."
validating	gerund	Checking that data meets the expected rules	"Validating on the server is required even if you validate on the client."

Related terms

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