diff --git a/leetcode/20 - validparenthesis/valid-parenthesis.js b/leetcode/20 - validparenthesis/valid-parenthesis.js
new file mode 100644
index 0000000..b41f838
--- /dev/null
+++ b/leetcode/20 - validparenthesis/valid-parenthesis.js	
@@ -0,0 +1,36 @@
+var isValid = function (s) {
+  var stack = [];
+  var dict = [];
+
+  dict.push({ key: "(", value: ")" });
+  dict.push({ key: "[", value: "]" });
+  dict.push({ key: "{", value: "}" });
+
+  const found = dict.find(element => element.key === '(');
+
+  for (const character of s) {
+    switch (character) {
+      case '(':
+      case '[':
+      case '{':
+        stack.push(dict.find(element => element.key === character));
+        break;
+      case ')':
+      case ']':
+      case '}':
+        const foundCharacter = dict.find(element => element.value === character);
+        if (stack.length === 0 || stack[stack.length - 1] != foundCharacter) {
+          return false;
+        }
+
+        stack.pop();
+        break;
+    }
+  }
+
+  return stack.length === 0;
+
+};
+
+console.log(isValid('()[]{}')); // true
+console.log(isValid('([)]')); // false
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