How to Securely Escape HTML Strings in jQuery to Prevent XSS Attacks?

Escaping HTML Strings in jQuery for Enhanced Security

Properly escaping HTML strings is critical to prevent cross-site scripting (XSS) attacks, where malicious scripts are injected into a web page through unprotected user input. jQuery provides powerful tools for DOM manipulation, making it essential to understand how to escape HTML strings effectively when using this framework.

Question:

How can HTML strings be securely escaped in jQuery to prevent XSS attacks?

Answer:

While jQuery does not have a built-in function for HTML escaping, there are several methods for implementing it using jQuery's capabilities:

Using the mustache.js Library:

Mustache.js provides a comprehensive method for HTML escaping:

var entityMap = {
  '&': '&',
  '<': '&amp;lt;',
  '>': '&amp;gt;',
  '"': '&amp;quot;',
  "'": '&amp;#39;',
  '/': '&amp;#x2F;',
  '`': '&amp;#x60;',
  '=': '&amp;#x3D;'
};

function escapeHtml (string) {
  return String(string).replace(/[&amp;<>"'`=\/]/g, function (s) {
    return entityMap[s];
  });
}

You can then use this function to escape HTML strings in jQuery:

var escapedString = escapeHtml(originalString);
$('element').html(escapedString);

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