diff --git a/MssqlMcp/Node/README.md b/MssqlMcp/Node/README.md
index 3f7e687..c72e1a6 100644
--- a/MssqlMcp/Node/README.md
+++ b/MssqlMcp/Node/README.md
@@ -142,11 +142,38 @@ This server leverages the Model Context Protocol (MCP), a versatile framework th
 
 - **SERVER_NAME**: Your MSSQL Database server name (e.g., `my-server.database.windows.net`)
 - **DATABASE_NAME**: Your database name
+- **AUTHENTICATION_TYPE**: Authentication method to use. Options:
+  - `"entra"` - Use Microsoft Entra ID (Azure AD) authentication with interactive browser login (default)
+  - `"sql"` - Use SQL Server authentication with username/password
+- **SQL_USER**: (Required when `AUTHENTICATION_TYPE` is `"sql"`) SQL Server username
+- **SQL_PASSWORD**: (Required when `AUTHENTICATION_TYPE` is `"sql"`) SQL Server password
 - **READONLY**: Set to `"true"` to restrict to read-only operations, `"false"` for full access
 - **Path**: Update the path in `args` to point to your actual project location.
 - **CONNECTION_TIMEOUT**: (Optional) Connection timeout in seconds. Defaults to `30` if not set.
 - **TRUST_SERVER_CERTIFICATE**: (Optional) Set to `"true"` to trust self-signed server certificates (useful for development or when connecting to servers with self-signed certs). Defaults to `"false"`.
 
+### Example: SQL Server Authentication
+
+```json
+{
+  "mcpServers": {
+    "mssql": {
+      "command": "node",
+      "args": ["C:/path/to/your/Node/dist/index.js"],
+      "env": {
+        "SERVER_NAME": "your-server-name",
+        "DATABASE_NAME": "your-database-name",
+        "AUTHENTICATION_TYPE": "sql",
+        "SQL_USER": "your_username",
+        "SQL_PASSWORD": "your_password",
+        "TRUST_SERVER_CERTIFICATE": "true",
+        "READONLY": "true"
+      }
+    }
+  }
+}
+```
+
 ## Sample Configurations
 
 You can find sample configuration files in the `src/samples/` folder:
diff --git a/MssqlMcp/Node/src/index.ts b/MssqlMcp/Node/src/index.ts
index 8dc1f30..c41197e 100644
--- a/MssqlMcp/Node/src/index.ts
+++ b/MssqlMcp/Node/src/index.ts
@@ -24,22 +24,62 @@ import { DescribeTableTool } from "./tools/DescribeTableTool.js";
 // MSSQL Database connection configuration
 // const credential = new DefaultAzureCredential();
 
+// Authentication types
+type AuthenticationType = 'sql' | 'entra';
+
 // Globals for connection and token reuse
 let globalSqlPool: sql.ConnectionPool | null = null;
 let globalAccessToken: string | null = null;
 let globalTokenExpiresOn: Date | null = null;
 
-// Function to create SQL config with fresh access token, returns token and expiry
-export async function createSqlConfig(): Promise<{ config: sql.config, token: string, expiresOn: Date }> {
+// Get authentication type from environment variable (defaults to 'entra' for backward compatibility)
+function getAuthenticationType(): AuthenticationType {
+  const authType = process.env.AUTHENTICATION_TYPE?.toLowerCase();
+  if (authType === 'sql') return 'sql';
+  if (authType === 'entra') return 'entra';
+  // Default to 'entra' for backward compatibility
+  return 'entra';
+}
+
+// Function to create SQL config - supports both SQL auth and Entra ID auth
+export async function createSqlConfig(): Promise<{ config: sql.config, token: string | null, expiresOn: Date | null }> {
+  const trustServerCertificate = process.env.TRUST_SERVER_CERTIFICATE?.toLowerCase() === 'true';
+  const connectionTimeout = process.env.CONNECTION_TIMEOUT ? parseInt(process.env.CONNECTION_TIMEOUT, 10) : 30;
+  const authType = getAuthenticationType();
+
+  if (authType === 'sql') {
+    // Use SQL Server authentication (username/password)
+    const sqlUser = process.env.SQL_USER;
+    const sqlPassword = process.env.SQL_PASSWORD;
+
+    if (!sqlUser || !sqlPassword) {
+      throw new Error('SQL authentication requires SQL_USER and SQL_PASSWORD environment variables');
+    }
+
+    return {
+      config: {
+        server: process.env.SERVER_NAME!,
+        database: process.env.DATABASE_NAME!,
+        user: sqlUser,
+        password: sqlPassword,
+        options: {
+          encrypt: true,
+          trustServerCertificate
+        },
+        connectionTimeout: connectionTimeout * 1000, // convert seconds to milliseconds
+      },
+      token: null,
+      expiresOn: null
+    };
+  }
+
+  // Use Entra ID (Azure AD) authentication
   const credential = new InteractiveBrowserCredential({
     redirectUri: 'http://localhost'
     // disableAutomaticAuthentication : true
   });
   const accessToken = await credential.getToken('https://database.windows.net/.default');
 
-  const trustServerCertificate = process.env.TRUST_SERVER_CERTIFICATE?.toLowerCase() === 'true';
-  const connectionTimeout = process.env.CONNECTION_TIMEOUT ? parseInt(process.env.CONNECTION_TIMEOUT, 10) : 30;
-
   return {
     config: {
       server: process.env.SERVER_NAME!,
@@ -164,8 +204,16 @@ runServer().catch((error) => {
 // Connect to SQL only when handling a request
 
 async function ensureSqlConnection() {
-  // If we have a pool and it's connected, and the token is still valid, reuse it
+  const authType = getAuthenticationType();
+
+  // If using SQL auth, just check if pool is connected (no token expiry to worry about)
+  if (authType === 'sql' && globalSqlPool && globalSqlPool.connected) {
+    return;
+  }
+
+  // If using Entra ID auth, check if pool is connected and token is still valid
   if (
+    authType === 'entra' &&
     globalSqlPool &&
     globalSqlPool.connected &&
     globalAccessToken &&
@@ -175,7 +223,7 @@ async function ensureSqlConnection() {
     return;
   }
 
-  // Otherwise, get a new token and reconnect
+  // Otherwise, get config (and new token if using Entra ID) and reconnect
   const { config, token, expiresOn } = await createSqlConfig();
   globalAccessToken = token;
   globalTokenExpiresOn = expiresOn;
diff --git a/MssqlMcp/Node/src/samples/claude_desktop_config.json b/MssqlMcp/Node/src/samples/claude_desktop_config.json
index 5f2c0fa..8714389 100644
--- a/MssqlMcp/Node/src/samples/claude_desktop_config.json
+++ b/MssqlMcp/Node/src/samples/claude_desktop_config.json
@@ -6,6 +6,7 @@
         "env": {
           "SERVER_NAME": "your-server-name.database.windows.net",
           "DATABASE_NAME": "your-database-name",
+          "AUTHENTICATION_TYPE": "entra",
           "READONLY": "false"
         }
       }
diff --git a/MssqlMcp/Node/src/samples/vscode_agent_config.json b/MssqlMcp/Node/src/samples/vscode_agent_config.json
index a8f91ff..85cfe24 100644
--- a/MssqlMcp/Node/src/samples/vscode_agent_config.json
+++ b/MssqlMcp/Node/src/samples/vscode_agent_config.json
@@ -8,6 +8,7 @@
                 "env": {
                   "SERVER_NAME": "your-server-name.database.windows.net",
                   "DATABASE_NAME": "your-database-name",
+                  "AUTHENTICATION_TYPE": "entra",
                   "READONLY": "false"
                 }
             }