diff --git a/test/test.type.ts b/test/test.type.ts
index 753ee95..b6e31f5 100644
--- a/test/test.type.ts
+++ b/test/test.type.ts
@@ -5,4 +5,10 @@ tap.test('should state valuid utf8', async () => {
   expect(smartstring.type.isUtf8('hithere')).to.be.true;
 });
 
+tap.test('should state wether base64 string is valid', async () => {
+  const base64String = smartstring.base64.encode('hi there');
+  expect(smartstring.type.isBase64(base64String)).to.be.true;
+  expect(smartstring.type.isBase64('hi there')).to.be.false;
+});
+
 tap.start();
\ No newline at end of file
diff --git a/ts/smartstring.type.ts b/ts/smartstring.type.ts
index 35ad5ed..bbfef91 100644
--- a/ts/smartstring.type.ts
+++ b/ts/smartstring.type.ts
@@ -1,4 +1,5 @@
 import * as plugins from './smartstring.plugins';
+import * as base64 from './smartstring.base64';
 
 export const isUtf8 = (stringArg: string) => {
   const bytes = Buffer.from(stringArg);
@@ -74,4 +75,8 @@ export const isUtf8 = (stringArg: string) => {
     }
 
     return true;
-};
\ No newline at end of file
+};
+
+export const isBase64 = (stringArg: string) => {
+  return stringArg.endsWith('=');
+};