XSS Pattern Checker
NewDetect common Cross-Site Scripting (XSS) patterns and payloads in text strings for educational and defensive security purposes. Checks for script injection patterns, event handlers, javascript: URIs, encoded XSS variants, DOM-based XSS patterns, and template injection syntax. Useful for security code reviews, input validation testing, learning XSS detection, and building WAF rules. Note: This tool is for educational and defensive use only.
XSS Pattern Detector
Detect common XSS patterns in user input. Educational tool for web developers to understand injection vectors.
This is a pattern-matching tool for educational purposes. It does not replace a full WAF or security audit.
How to Use XSS Pattern Checker
- 1Paste text or a URL parameter value to analyze
- 2View detected XSS patterns and risk level
- 3See which patterns triggered (script, event handler, etc.)
- 4Use findings to improve input sanitization
Your Privacy is Protected
XSS Pattern Checker runs entirely in your browser. Your files and data are never uploaded to any server, never stored, and never shared. Everything happens locally on your device using secure browser APIs.
Frequently Asked Questions
What is XSS?
Cross-Site Scripting (XSS) is a web security vulnerability where attackers inject malicious scripts into web pages viewed by other users. It can steal sessions, redirect users, or deface sites.
Why Use This Tool?
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