DIY Security: Writing Your Own HTML Sanitizer from Scratch

Website security is a critical concern for businesses and individuals alike. Today more than ever, with all the connected devices and more websites than people on this planet. One of the most common threats to website security is HTML injection, a type of attack where malicious code is inserted into a website’s HTML. To protect against this, it is essential to sanitize user input and remove any potentially harmful HTML elements. While there are many existing libraries that can help with this, some developers choose to write their own HTML sanitizer from scratch. In this article, we will explore the process of writing your own HTML sanitizer, including the benefits and challenges of doing so, and provide a step-by-step guide for implementing a custom HTML sanitizer for your website.

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Here is an example of how you can implement a simple HTML sanitizer in JavaScript:

function sanitizeHTML(html) {
  // Define the list of allowed HTML elements and attributes
  const…