diff --git a/src/base32.js b/src/base32.js
index 05f7ff5..815947e 100644
--- a/src/base32.js
+++ b/src/base32.js
@@ -4,7 +4,7 @@
  *  @author   : Gin (gin.lance.inside@hotmail.com)
  */
 
- class Base32 {
+ export default class Base32 {
     static decode() {
         console.log("static Base32.decode");
     }
diff --git a/src/hotp.js b/src/hotp.js
index ca8c694..00c08b2 100644
--- a/src/hotp.js
+++ b/src/hotp.js
@@ -5,7 +5,7 @@
 
 import OTP from './otp';
 
-class HOTP extends OTP {
+export default class HOTP extends OTP {
     /*＊
      * Generate the OTP with the given count
      *
diff --git a/src/jsotp.js b/src/jsotp.js
index c446fdb..afda1d4 100644
--- a/src/jsotp.js
+++ b/src/jsotp.js
@@ -5,8 +5,16 @@
  *  @Disc     : a node module to generate and verify one-time passwords
  */
 
-function jsotp(name) {
-    console.log(`Hello ${name}`);
-}
+import OTP from './otp';
+import TOTP from './totp';
+import HOTP from './hotp';
+import Base32 from './base32';
+import Util from './util';
 
-exports.jsotp = jsotp
\ No newline at end of file
+export {
+    OTP,
+    TOTP,
+    HOTP,
+    Base32,
+    Util
+};
\ No newline at end of file
diff --git a/src/totp.js b/src/totp.js
index 259401d..eebbec9 100644
--- a/src/totp.js
+++ b/src/totp.js
@@ -5,7 +5,7 @@
 
 import OTP from './otp';
 
- class TOTP extends OTP {
+export default class TOTP extends OTP {
     /*＊
      * @param {secret}
      * @type {String} 
diff --git a/src/util.js b/src/util.js
index 4862081..39efa29 100644
--- a/src/util.js
+++ b/src/util.js
@@ -3,6 +3,6 @@
  *  @author   : Gin (gin.lance.inside@hotmail.com)
  */
 
- class Util {
+ export default class Util {
     
  }
\ No newline at end of file