diff --git a/leetcode/20 - validparenthesis/validParenthesis.js b/leetcode/20 - validparenthesis/validParenthesis.js
new file mode 100644
index 0000000..6a9672e
--- /dev/null
+++ b/leetcode/20 - validparenthesis/validParenthesis.js	
@@ -0,0 +1,24 @@
+/**
+ * @param {string} s
+ * @return {boolean}
+ */
+var isValid = function (s) {
+	if (s.length <= 1) return false;
+
+	const left = '{[(';
+
+	let stack = [];
+
+	for (let i = 0; i < s.length; i++) {
+		if (left.indexOf(s[i]) >= 0) {
+			stack.push(s[i]);
+		} else {
+			if (stack.length === 0) return false;
+			const last = stack.pop();
+			const pair = `${last}${s[i]}`;
+			if (pair !== '{}' && pair !== '[]' && pair !== '()') return 0;
+		}
+	}
+
+	return stack.length === 0;
+};