Class 'MongoDB\Driver\Manager' not found
Stefan Bogdanescu
Founder & Senior Architect · 2026-06-29
Title: Understanding and Resolving "Class 'MongoDB\Driver\Manager' not found" Error When Integrating MongoDB with Laravel
Body:
When integrating MongoDB with your Laravel application using the jenssegers/laravel-mongodb package, you might encounter the error "FatalErrorException in Client.php line 56: Class 'MongoDB\Driver\Manager' not found" while running your code. This error typically occurs when the required classes for interacting with MongoDB are missing from your project.
To resolve this problem, follow these steps.
1. Ensure that you have installed and configured the jenssegers/laravel-mongodb package correctly. You can check out their installation guide on GitHub: https://github.com/jenssegers/laravel-mongodb#installation.
2. Confirm that your Laravel project is using composer autoloading to register the required namespaces. The autoloader can be found in the root of your project. For example, assume you have installed laravel-mongodb via Composer:
```php
require __DIR__.'/autoload.php';
$loader = require 'vendor/autoload.php';
// ... (existing code)
```
3. Ensure that the jenssegers/laravel-mongodb package is registered in your composer.json file:
```json
"require": {
"jenssegers/laravel-mongodb": "*"
}
```
4. Verify your PHP configuration to ensure that the mongo extension is enabled and that MongoDB client libraries are being loaded in the correct location. This can be found in your phpinfo() output in the "Mongodb" section:
- Ensure that mongo.so is listed under Loaded Extensions.
- Check if mongo support is set to On.
5. Double-check your code and confirm you are using the correct namespaces for MongoDB classes. In this case, the code you provided should be:
```php