Answer
Input validation ensures request data meets expected formats and prevents injection attacks using libraries like Joi or Zod.
Quick Answer
Input validation ensures data from the user matches expected formats before you process it — preventing SQL injection, XSS, type errors, and business logic bugs. Always validate on the server, even if you validate on the frontend too. Libraries like Joi, Zod, or express-validator make it easy to define schemas and validate req.body automatically.
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SugharaIQ Editorial Team
Verified Answer
This answer has been peer-reviewed by industry experts holding senior engineering roles to ensure technical accuracy and relevance for modern interview standards.
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Source: SugharaIQ