SQLSTATE[42000]: Syntax error or access violation: 1071 Specified key was too long; max key length is 767 bytes

According to the official documentation, you can solve this quite easily.

Add following code to AppServiceProvider.php (/app/Providers/AppServiceProvider.php)

use Illuminate\Database\Schema\Builder; // Import Builder where defaultStringLength method is defined

function boot()
{
    Builder::defaultStringLength(191); // Update defaultStringLength
}

MySQL reserves always the max amount for a UTF8 field which is 4 bytes so with 255 + 255 with your DEFAULT CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci; you are over the 767 max key length limit. By @scaisedge

And Another Solution is –

in AppServiceProvider didn’t work for me. What worked for was editing the database.php file in config folder. Just edit

'charset' => 'utf8mb4',
'collation' => 'utf8mb4_unicode_ci',

to

'charset' => 'utf8',
'collation' => 'utf8_unicode_ci',

and it should work, although you will be unable to store extended multibyte characters like emoji.

I did it with Laravel 5.7. Hope it helps.