Answer by basak for Login only if user is active using Laravel

Laravel 6.6 tested. Overwrite validateLogin in your LoginController.php

use Illuminate\Http\Request;use App\User;use Illuminate\Validation\ValidationException;

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/** * Validate the user login request. * * @param  \Illuminate\Http\Request  $request * @return void * * @throws \Illuminate\Validation\ValidationException */protected function validateLogin(Request $request){    // Get the user details from database and check if user is exist and active.    $user = User::where('email',$request->email)->first();    if( $user && !$user->activation){        throw ValidationException::withMessages([$this->username() => __('User has been desactivated.')]);    }    // Then, validate input.    return $request->validate([        $this->username() => 'required|string','password' => 'required|string',    ]);}