diff --git a/README.md b/README.md
index b4fef9b..bace41d 100644
--- a/README.md
+++ b/README.md
@@ -23,32 +23,7 @@ npm install sonarqube-webapis --save
 ```
 
 ## Usage Example
-```js
-// Example 1: get all components / projects in the organization.
-import { AxiosError } from 'axios';
-import Sonar from 'sonarqube-webapis';
-
-(async () => {
-  // Initiate Sonar.
-  const sonar = new Sonar({
-    auth: {
-      username: '',
-      password: '',
-    },
-    // You can use sonarcloud / sonarqube web api url.
-    baseURL: 'https://sonarcloud.io/api',
-  });
-  try {
-    // {@link https://sonarcloud.io/web_api/api/components/search}
-    const result = await sonar.components.search('my-org2');
-    // The result is in: result.data
-    console.log('Components:', result.data.components);
-  } catch (error) {
-    // This is to show error messages from sonar.
-    console.log('Errors: ',(error as AxiosError).response?.data.errors);
-  }
-})();
-```
+See samples folder.
 
 ## License
 The project is available under the [MIT license](https://tldrlegal.com/license/mit-license).
\ No newline at end of file
diff --git a/samples/sample-01.ts b/samples/sample-01.ts
new file mode 100644
index 0000000..7514b63
--- /dev/null
+++ b/samples/sample-01.ts
@@ -0,0 +1,37 @@
+/**
+ * @file
+ * sample-01.ts
+ *
+ * Example 1: makesure your web api credential is correct.
+ *
+ * @see https://docs.sonarqube.org/latest/extend/web-api/#header-2
+ */
+
+import { AxiosError } from 'axios';
+import Sonar from 'sonarqube-webapis';
+
+(async () => {
+  // Initiate Sonar.
+  const sonar = new Sonar({
+    // 1. User token: set your token in the username, set empty string password.
+    // 2. Basic access: set your standard login username & password.
+    auth: {
+      username: 'token / your login username',
+      password: 'empty string / your login password',
+    },
+    // You can use sonarcloud / sonarqube web api url.
+    baseURL: 'https://sonarcloud.io/api',
+    // baseURL: 'http://localhost:9000/api',
+  });
+  try {
+    // {@link https://sonarcloud.io/web_api/api/authentication/validate}
+    // {@link http://localhost:9000/web_api/api/authentication/validate}
+    const result = await sonar.authentication.validate();
+    // The result is in: result.data
+    // Sample: { valid: true }
+    console.log('Validation result:', result.data);
+  } catch (error) {
+    // This is to show error messages from sonar.
+    console.log('Errors: ', (error as AxiosError).response?.data);
+  }
+})();