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snippets/js/s/escape-html.md

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+---
+title: Escape HTML
+type: snippet
+language: javascript
+tags: [string,regexp]
+cover: periscope
+dateModified: 2021-10-13T19:29:39+02:00
+---
+
+Escapes a string for use in HTML.
+
+- Use `String.prototype.replace()` with a regexp that matches the characters that need to be escaped.
+- Use the callback function to replace each character instance with its associated escaped character using a dictionary object.
+
+```js
+const escapeHTML = str =>
+  str.replace(
+    /[&<>'"]/g,
+    tag =>
+      ({
+        '&': '&amp;',
+        '<': '&lt;',
+        '>': '&gt;',
+        "'": '&#39;',
+        '"': '&quot;'
+      }[tag] || tag)
+  );
+```
+
+```js
+escapeHTML('<a href="#">Me & you</a>');
+// '&lt;a href=&quot;#&quot;&gt;Me &amp; you&lt;/a&gt;'
+```