Sanitise User Input for HTML Output
Encode user-provided strings before inserting them into HTML โ prevents XSS injection attacks.
Common HTML entities reference
Security tips
Paste any user input here to see exactly which characters get encoded. < becomes <, > becomes >, & becomes & โ all rendered as text, not HTML.
Cross-Site Scripting (XSS) attacks inject <script> tags via user input fields. Encoding all user output is the primary defense.
Always encode on output (when rendering), not on input (when saving). Store raw data, encode when displaying โ this avoids double-encoding bugs.
Test with payloads like <script>alert(1)</script> and onmouseover="alert(1)" to verify your encoding catches all attack vectors.
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