web/app/src/views/TagsView.vue

@@ -19,7 +19,13 @@
             placeholder="New Tag Name"
             class="create-tag-input"
           />
-          <button id="submit-button" type="submit">Create Tag</button>
+          <button
+            id="submit-button"
+            type="submit"
+            :disabled="newTagName.trim() === ''"
+          >
+            Create Tag
+          </button>
         </div>
       </form>
     </div>