Question 1

How to validate an email address using validator.js?

Accepted Answer

Use the isEmail function with optional parameters like allow_display_name or require_tld. Import it individually (e.g., from validator/lib/isEmail) to optimize bundle size, and refer to the README for all configurable options.

Question 2

validator.js vs Joi: which is better for Node.js API validation?

Accepted Answer

validator.js excels at lightweight, function-based string validation with no dependencies, ideal for simple checks. Joi is better for complex schema validation with object structures and declarative rules. Choose based on whether you need schema support or minimal footprint.

Question 3

Does validator.js support phone number validation for multiple countries?

Accepted Answer

Yes, the isMobilePhone validator supports numerous locales (e.g., en-US, fr-FR) with options for strict mode. Check the locale list in the README, which includes over 50 regions, and use an array for multi-locale validation.

Question 4

How to sanitize user input to prevent XSS with validator.js?

Accepted Answer

validator.js removed XSS sanitization; use external libraries like DOMPurify. However, it includes escape and unescape functions for basic HTML entity handling, and sanitizers like stripLow for control characters.

Question 5

Can I use validator.js in React for form validation?

Accepted Answer

Yes, integrate it with React by importing validators in useEffect or form handlers. Since it's framework-agnostic, pair it with state management (e.g., useState) or libraries like Formik, but note it only validates strings, not form state.

Question 6

What are common mistakes when using validator.js?

Accepted Answer

Forgetting to coerce non-strings to strings, misconfiguring locale options leading to false negatives, and overlooking the removed XSS sanitization. Always check input types and test with edge cases using the provided options.

validator.js

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