diff --git a/.github/workflows/test-node.yml b/.github/workflows/test-node.yml
index 38fe2fa..fb6e4ea 100644
--- a/.github/workflows/test-node.yml
+++ b/.github/workflows/test-node.yml
@@ -11,6 +11,7 @@ on:
       - '!CHANGELOG.md'
       - '!.github/**'
       - '!.vscode/**'
+      - '.github/workflows/app-test.yml'
   # trigger deployment manually
   workflow_dispatch:
 
diff --git a/README.md b/README.md
index 926e686..159b934 100644
--- a/README.md
+++ b/README.md
@@ -4,7 +4,8 @@
 
 `machini` is a utility to get hardware information about system devices.
 
-- Lightweight, zero-dependency, super-fast!
+- Lightweight and Fast!
+- It doesn't use any additional modules - it utilizes pure NodeJS APIs.
 - You don't need system privileges to get the value.
 - Friendly to modern **Node.js** development and [**TypeScript**](https://www.typescriptlang.org).
 - Cross-platform (Windows, macOS, Unix/Linux) support.
diff --git a/lib/index.ts b/lib/index.ts
index b23e95c..01efde3 100644
--- a/lib/index.ts
+++ b/lib/index.ts
@@ -1,47 +1,57 @@
 import { platform } from 'os';
 import { exec as processExec } from 'child_process';
 
-export default class Machini {
-	static machineId(): Promise<string> {
-		return new Promise((resolve, reject) => {
-			const platformName = platform();
-			let execCommands = '';
-
-			if (platformName === 'win32') {
-				execCommands =
-					'for /f "tokens=3 delims= " %i in (\'REG QUERY HKLM\\SOFTWARE\\Microsoft\\Cryptography /v MachineGuid ^| findstr MachineGuid\') do @echo %i';
-			} else if (platformName === 'darwin') {
-				execCommands =
-					"ioreg -rd1 -c IOPlatformExpertDevice | awk '/IOPlatformUUID/' | cut -d '\"' -f4";
-			} else if (platformName === 'freebsd') {
-				execCommands = 'kenv -q smbios.system.uuid || sysctl -n kern.hostuuid';
-			} else {
-				execCommands =
-					'(cat /var/lib/dbus/machine-id /etc/machine-id 2> /dev/null || hostname) | head -n 1 || :';
-			}
-
-			const execProcess = processExec(
-				execCommands,
-				{ encoding: 'utf8', windowsHide: true },
-				(error, stdout) => {
-					if (error) {
-						reject(error);
-						return;
-					}
+const execCommand = (platformName: string, command: string): Promise<string> =>
+	new Promise((resolve, reject) => {
+		const execCommandProcess = processExec(
+			command,
+			{ encoding: 'utf8', windowsHide: true },
+			(error, stdout) => {
+				if (error) {
+					reject(error);
+					return;
+				}
 
-					const output = platformName === 'win32' ? stdout : stdout.split('\r\n')?.[0] || '';
+				const output = platformName === 'win32' ? stdout : stdout.split('\r\n')?.[0] || '';
 
-					if (output) {
-						resolve(output);
-						return;
-					}
+				execCommandProcess?.stdin?.end();
 
-					reject(new Error(`Failed to get machine id`));
+				if (output) {
+					resolve(output);
+					return;
 				}
-			);
 
-			execProcess?.stdin?.end();
-		});
+				reject(new Error(`Command failed`));
+			}
+		);
+	});
+
+export default class Machini {
+	static async machineId(): Promise<string> {
+		const platformName = platform();
+		let command = '';
+
+		if (platformName === 'win32') {
+			command =
+				'for /f "tokens=3 delims= " %i in (\'REG QUERY HKLM\\SOFTWARE\\Microsoft\\Cryptography /v MachineGuid ^| findstr MachineGuid\') do @echo %i';
+		} else if (platformName === 'darwin') {
+			command = "ioreg -rd1 -c IOPlatformExpertDevice | awk '/IOPlatformUUID/' | cut -d '\"' -f4";
+		} else if (platformName === 'freebsd') {
+			command = 'kenv -q smbios.system.uuid || sysctl -n kern.hostuuid';
+		} else {
+			command =
+				'(cat /var/lib/dbus/machine-id /etc/machine-id 2> /dev/null || hostname) | head -n 1 || :';
+		}
+
+		try {
+			return await execCommand(platformName, command);
+		} catch (error) {
+			if (error instanceof Error) {
+				throw new Error(error?.message);
+			}
+		}
+
+		throw new Error('Failed to get machine id');
 	}
 }