diff --git a/lib/processMultipart.js b/lib/processMultipart.js
index 990639b..5f3d24c 100644
--- a/lib/processMultipart.js
+++ b/lib/processMultipart.js
@@ -111,7 +111,7 @@ module.exports = (options, req, res, next) => {
     });
 
     file.on('data', (data) => {
-      uploadTimer.set(); // Refresh upload timer each time new data chunk came.
+      uploadTimer.refresh(); // Refresh upload timer each time new data chunk came.
       dataHandler(data); // Handle new piece of data.
     });
 
diff --git a/lib/uploadtimer.js b/lib/uploadtimer.js
index d29ab46..007e517 100644
--- a/lib/uploadtimer.js
+++ b/lib/uploadtimer.js
@@ -1,24 +1,45 @@
 class UploadTimer {
   /**
    * @constructor
-   * @param {number} timeout - timer timeout in msecs. 
+   * @param {number} timeout - timer timeout in msecs.
    * @param {Function} callback - callback to run when timeout reached.
    */
-  constructor(timeout = 0, callback = () => {}) {
-    this.timeout = timeout;
-    this.callback = callback;
+  constructor(timeout, callback) {
+    this.timeout = timeout || 0;
+    this.callback = callback || (() => {});
     this.timer = null;
   }
 
+  /**
+   * Sets the timer.
+   * Initializes & starts the timer.
+   * @returns {boolean} True if timer has been set.
+   */
+  set() {
+    if (this.timer || !this.timeout) return false;
+    this.timer = setTimeout(() => {
+      this.clear();
+      this.callback();
+    }, this.timeout);
+    return true;
+  }
+
+  /**
+   * Clears the timer.
+   * If timer cleared, it has to be re-initialized again with set method.
+   */
   clear() {
     clearTimeout(this.timer);
   }
 
-  set() {
-    // Do not start a timer if zero timeout or it hasn't been set. 
-    if (!this.timeout) return false;
-    this.clear();
-    this.timer = setTimeout(this.callback, this.timeout);
+  /**
+   * Refreshes timer.
+   * @returns {boolean} True if timer has been refreshed.
+   */
+  refresh() {
+    // Do nothing if zero/empty timeout or timer hasn't been initialized.
+    if (!this.timer) return false;
+    this.timer.refresh();
     return true;
   }
 }
diff --git a/test/uploadtimer.spec.js b/test/uploadtimer.spec.js
index 9dfd158..9b91ce6 100644
--- a/test/uploadtimer.spec.js
+++ b/test/uploadtimer.spec.js
@@ -6,13 +6,14 @@ const UploadTimer = require('../lib/uploadtimer');
 describe('uploadTimer: Test UploadTimer class', () => {
 
   it('It runs a callback function after specified timeout.', (done) => {
-    const uploadTimer = new UploadTimer(1000, done);
+    const uploadTimer = new UploadTimer(500, done);
     uploadTimer.set();
   });
 
   it('set method returns true if timeout specified.', () => {
-    const uploadTimer = new UploadTimer(1000);
+    const uploadTimer = new UploadTimer(500);
     assert.equal(uploadTimer.set(), true);
+    uploadTimer.clear();
   });
 
   it('set method returns false if timeout has not specified.', () => {
@@ -25,4 +26,16 @@ describe('uploadTimer: Test UploadTimer class', () => {
     assert.equal(uploadTimer.set(), false);
   });
 
+  it('set method returns false if timer allready set.', () => {
+    const uploadTimer = new UploadTimer(500);
+    uploadTimer.set();
+    assert.equal(uploadTimer.set(), false);
+    uploadTimer.clear();
+  });
+
+  it('refresh method returns false if timer has not been set/initialized.', () => {
+    const uploadTimer = new UploadTimer(500);
+    assert.equal(uploadTimer.refresh(), false);
+  });
+
 });