XSS Validator
Detect and sanitize potential Cross-Site Scripting vulnerabilities
xsscross-sitescriptingsecurityvalidationsanitizeinjection
XSS Vulnerability Scanner
Detect and prevent Cross-Site Scripting attacks. Test your inputs against common XSS patterns and get instant security recommendations.
Instant validation
100% client-side
12+ XSS patterns
XSS Prevention Best Practices
Input Validation
- Validate all input on the server side
- Use allowlists instead of blocklists
- Reject invalid input rather than sanitizing
Output Encoding
- HTML encode for HTML context
- JavaScript encode for JS context
- URL encode for URL context
Security Headers
- Use Content Security Policy (CSP)
- Enable X-XSS-Protection header
- Set X-Content-Type-Options