diff --git a/group-anagrams/nodejs/index.js b/group-anagrams/nodejs/index.js
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+/*
+ * Given an array of strings, group anagrams together.
+ *
+ * Example: 
+ * Input: ["eat", "tea", "tan", "ate", "nat", "bat"],
+ * Output: [
+ *    ["ate","eat","tea"],
+ *    ["nat","tan"],
+ *    ["bat"]
+ * ]
+ * 
+ * Note: 
+ * All inputs will be in lowercase.
+ * The order of your output does not matter.
+ *
+*/
+const { assert }  = require('../../util/js'); 
+
+/**
+ * @param {string[]} strs
+ * @return {string[][]}
+ */
+const groupAnagrams = (strs) => {
+    const map = {};
+    strs.forEach(str => {
+       const key = str.split('').sort().join('');
+       if (!map[key]) {
+           map[key] = [str];
+       } else {
+           map[key].push(str);
+       }
+    });
+    
+    return Object.values(map);
+};
+
+/* Test Case 1
+ * Input: ["eat", "tea", "tan", "ate", "nat", "bat"],
+ * Output: [
+ *    ["ate","eat","tea"],
+ *    ["nat","tan"],
+ *    ["bat"]
+ * ]
+ */
+x = [ 'eat', 'tea', 'tan', 'ate', 'nat', 'bat'];
+sol = [['eat', 'tea', 'ate'], ['tan', 'nat'], ['bat']];
+assert(JSON.stringify(groupAnagrams(x)) === JSON.stringify(sol), `Output: ${JSON.stringify(sol)}`);