Encode special HTML characters (<, >, &, quotes) to HTML entities, or decode entities back to plain text.
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HTML entity encoding converts special characters that have meaning in HTML syntax into safe representations that display correctly in browsers without being interpreted as code. The five characters with special HTML meaning — angle brackets, ampersand, and quotation marks — must be encoded when they appear as literal content.
Cross-Site Scripting (XSS) is one of the most common web vulnerabilities, and HTML encoding is the primary defence. If your application displays user-submitted content without encoding, an attacker can inject a script tag into a page that other users visit. Their browser executes the injected script. Encoding converts the angle bracket to its entity equivalent so the browser renders it as text, not as the start of an HTML tag — the attack is neutralised.
Output encoding which means applying HTML entity encoding to all user-supplied content before rendering it in a web page is the primary defence against Cross-Site Scripting attacks. These remain one of the most common web application vulnerabilities. A web application that displays a user's submitted comment without encoding it allows an attacker to inject script tags that execute in other users' browsers, potentially stealing session cookies or redirecting visitors to phishing pages.
Different contexts within an HTML document require different encoding approaches. HTML element content requires entity encoding of the five special characters including angle brackets, ampersand, and quotes. JavaScript context requires JavaScript string encoding, not HTML encoding. URL parameters require URL percent-encoding. Using the wrong encoding for the context can create security vulnerabilities and corrupt the intended output simultaneously. Always use an encoding library appropriate for your specific programming language and context.
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