diff --git a/javascript/1456-maximum-number-of-vowels-in-a-substring-of-given-length.js b/javascript/1456-maximum-number-of-vowels-in-a-substring-of-given-length.js
new file mode 100644
index 000000000..76c1c12eb
--- /dev/null
+++ b/javascript/1456-maximum-number-of-vowels-in-a-substring-of-given-length.js
@@ -0,0 +1,38 @@
+const maxVowels = (s, k) => {
+    let winStartPointer = 0
+    let winEndPointer = 0 + (k - 1)
+
+    const sl = s.toLowerCase()
+
+    let vowelCounter = 0
+    let maxVowelCount = 0
+
+    //
+    let vowelsSet = new Set(['a', 'e', 'i', 'o', 'u'])
+
+    for (let i = winStartPointer; i <= winEndPointer; i++) {
+        if (vowelsSet.has(sl[i])) {
+            vowelCounter++
+        }
+    }
+    maxVowelCount = vowelCounter
+
+    while (winEndPointer < sl.length) {
+
+        if (vowelsSet.has(sl[winStartPointer])) {
+            vowelCounter--
+        }
+        if (vowelsSet.has(sl[winEndPointer + 1])) {
+
+            vowelCounter++
+        }
+        if (vowelCounter > maxVowelCount) {
+            maxVowelCount = vowelCounter
+        }
+
+        winStartPointer++
+        winEndPointer++
+    }
+
+    return maxVowelCount
+}
\ No newline at end of file