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Class ‘Validator’ not found in Lumen

Solution:1

Validator is a facade. Facades aren’t enabled by default in lumen.

If you would like to use the a facade, you should uncomment the

$app->withFacades();

call in your bootstrap/app.php file.

Solution:2

This is for Lumen version 5.3 (as shown in the docs):

use Illuminate\Http\Request;

$app->post('/user', function (Request $request) {
    $this->validate($request, [
    'name' => 'required',
    'email' => 'required|email|unique:users'
 ]);

    // Store User...
});

https://lumen.laravel.com/docs/5.3/validation