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What is ADB?

Android Debug Bridge (ADB) is a command-line tool from Google that enables communication between your computer and Android devices. APK Extractor requires ADB to:
  • Connect to Android devices (USB or WiFi)
  • List installed applications
  • Extract APK files from devices
  • Read device properties and metadata
APK Extractor automatically searches for ADB in multiple locations and provides options to download or configure it manually.

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Automatic ADB Detection

When you first launch APK Extractor, it automatically searches for ADB in the following order:
  1. config.txt file - Previously saved ADB path
  2. System PATH - Checks if adb command is available
  3. C:\platform-tools\adb.exe - Common installation location
The search logic from server.js:30: 
function getAdbPath() {
  if (_adbPathCache) return _adbPathCache;
  if (fs.existsSync(CONFIG_FILE)) {
    const saved = fs.readFileSync(CONFIG_FILE, 'utf8').trim();
    if (saved && fs.existsSync(saved)) { _adbPathCache = saved; return saved; }
  }
  try {
    const found = execSync('where adb', { encoding: 'utf8' }).trim().split('\n')[0].trim();
    if (found) { saveAdbPath(found); return found; }
  } catch { }
  const def = 'C:\\platform-tools\\adb.exe';
  if (fs.existsSync(def)) { saveAdbPath(def); return def; }
  return null;
}
If ADB is found automatically, the path is saved to config.txt for faster startup next time.

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Download ADB Automatically

If ADB is not found, APK Extractor can download and install it for you:

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Web Interface

The server provides an automated download endpoint at /api/config/download that:
  1. Downloads Android Platform Tools from Google’s official repository
  2. Extracts it to C:\platform-tools\
  3. Saves the path to config.txt
  4. Returns real-time progress via Server-Sent Events (SSE)
The download process (server.js:140): 
app.get('/api/config/download', (req, res) => {
  const zipUrl = 'https://dl.google.com/android/repository/platform-tools-latest-windows.zip';
  const zipPath = path.join(os.tmpdir(), 'platform-tools.zip');
  const destDir = 'C:\\';
  
  // Downloads zip file
  const dlCmd = `powershell -Command "Invoke-WebRequest -Uri '${zipUrl}' -OutFile '${zipPath}' -UseBasicParsing"`;
  
  // Extracts to C:\platform-tools
  const extractCmd = `powershell -Command "Expand-Archive -Path '${zipPath}' -DestinationPath '${destDir}' -Force"`;
  
  // Saves path
  saveAdbPath('C:\\platform-tools\\adb.exe');
});

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CLI Tool

The batch script (apk-downloader.bat:122) offers the same functionality: 
echo  Descargando Android Platform Tools desde Google...
echo  URL: https://dl.google.com/android/repository/platform-tools-latest-windows.zip

curl -L -o "%TEMP%\platform-tools.zip" "https://dl.google.com/android/repository/platform-tools-latest-windows.zip"

tar -xf "%TEMP%\platform-tools.zip" -C "C:\"

set "ADB_EXE=C:\platform-tools\adb.exe"
echo %ADB_EXE%>"%CONFIG_FILE%"
The automatic download requires administrator privileges to write to C:\platform-tools\. If extraction fails, you’ll need to manually extract the zip file.

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Manual Path Configuration

If you already have ADB installed (e.g., from Android Studio), you can manually configure the path.

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Via Web Interface

Use the /api/config/path endpoint: 
POST /api/config/path
Content-Type: application/json

{
  "path": "C:\\Users\\YourName\\AppData\\Local\\Android\\Sdk\\platform-tools\\adb.exe"
}
The server validates the path exists before saving (server.js:131): 
app.post('/api/config/path', (req, res) => {
  const { path: adbPath } = req.body;
  if (!adbPath || !fs.existsSync(adbPath)) {
    return res.status(400).json({ error: 'Ruta inválida o no existe' });
  }
  saveAdbPath(adbPath);
  res.json({ ok: true, adbPath });
});

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Via CLI

The batch script prompts for manual input (apk-downloader.bat:102): 
echo  Ingresa la ruta completa a adb.exe
echo  Ejemplo: C:\Users\User\AppData\Local\Android\Sdk\platform-tools\adb.exe
set /p USER_ADB="  Ruta: "

if not exist "%USER_ADB%" (
    echo  [!] El archivo no existe en esa ruta.
    goto MANUAL_PATH
)
set "ADB_EXE=%USER_ADB%"
echo %ADB_EXE%>"%CONFIG_FILE%"

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config.txt File Format

The config.txt file is a simple text file containing the absolute path to adb.exe: 
C:\platform-tools\adb.exe
File location: Same directory as server.js or apk-downloader.bat Format: Single line with the full path (no quotes, no extra whitespace) Save function (server.js:45): 
function saveAdbPath(p) {
  _adbPathCache = p.trim();
  fs.writeFileSync(CONFIG_FILE, _adbPathCache, 'utf8');
}
The path is cached in memory (_adbPathCache) for performance. The file is only read once on startup.

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Changing the ADB Path

You can change or reset the ADB configuration at any time.

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Reset Configuration

Delete the saved path to trigger automatic detection again: 
DELETE /api/config
This removes config.txt and clears the cache (server.js:125): 
app.delete('/api/config', (req, res) => {
  try { if (fs.existsSync(CONFIG_FILE)) fs.unlinkSync(CONFIG_FILE); } catch { }
  _adbPathCache = null;
  res.json({ ok: true });
});

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Update to New Path

Send a new path via POST request (see Manual Path Configuration).

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Via CLI

In the batch script, select option [4] Cambiar ruta de ADB from the main menu: 
if "%MAIN_CHOICE%"=="4" (
    del "%CONFIG_FILE%" >nul 2>&1
    goto SETUP_ADB
)

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Verification

Check if ADB is configured correctly: 
GET /api/status
Response: 
{
  "configured": true,
  "adbPath": "C:\\platform-tools\\adb.exe"
}
Implementation (server.js:120): 
app.get('/api/status', (req, res) => {
  const adb = getAdbPath();
  res.json({ configured: !!adb, adbPath: adb || null });
});
If configured is false, all device operations will fail with “ADB no configurado” error.

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Common Locations

ADB is typically found in these locations:
Installation MethodTypical Path
Platform ToolsC:\platform-tools\adb.exe
Android StudioC:\Users\{Username}\AppData\Local\Android\Sdk\platform-tools\adb.exe
ChocolateyC:\ProgramData\chocolatey\bin\adb.exe
System PATHDetected via where adb command

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Troubleshooting

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ADB Not Found Error

If you see “ADB no configurado” errors:
  1. Check config.txt exists and contains a valid path
  2. Verify the file at that path exists and is executable
  3. Try deleting config.txt to trigger auto-detection
  4. Use the automatic download feature

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Path with Spaces

ADB paths with spaces work correctly - they are properly quoted when executing commands (server.js:99): 
function adbCmd(args, serial = null) {
  const adb = getAdbPath();
  if (!adb) throw new Error('ADB no configurado');
  const serialFlag = serial ? `-s "${serial}"` : '';
  return `"${adb}" ${serialFlag} ${args}`;
}

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Permission Issues

If ADB fails to run:
  • Ensure the ADB executable has execution permissions
  • On Windows, ADB may be blocked by antivirus software
  • Try running APK Extractor as administrator

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