SQLSTATE[HY000] [1698] Access denied for user 'hadi'#'localhost' - laravel

Question

currently I install laravel 8 in my Linux operating system without any error, so I started working on a simple blog-post application, and when I run php artisan migrate I get the following error.
Illuminate\Database\QueryException
SQLSTATE[HY000] [1698] Access denied for user 'hadi'#'localhost' (SQL: select * from information_schema.tables where table_schema = blog and table_name = migrations and table_type = 'BASE TABLE')
at vendor/laravel/framework/src/Illuminate/Database/Connection.php:671
667▕ // If an exception occurs when attempting to run a query, we'll format the error
668▕ // message to include the bindings with SQL, which will make this exception a
669▕ // lot more helpful to the developer instead of just the database's errors.
670▕ catch (Exception $e) {
➜ 671▕ throw new QueryException(
672▕ $query, $this->prepareBindings($bindings), $e
673▕ );
674▕ }
675▕
+34 vendor frames
35 artisan:37
Illuminate\Foundation\Console\Kernel::handle()
I search for my problem here and other sites but I can't find an exact solution.
Hope to get one

Answer 1

Check your file .env. Make sure its correctly.
DB_CONNECTION=mysql
DB_HOST=127.0.0.1
DB_PORT=3306
DB_DATABASE=your_database_name
DB_USERNAME=your_username
DB_PASSWORD=your_password
In case, you put correct credential but it still not work you can:
Delete Cache Files From root/boostrap/chache/files and Run The App