Lumen Micro Framework => php artisan key:generate

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The Laravel command is fairly simple. It just generates a random 32 character long string. You can do the same in Lumen. Just temporarily add a route like this:

$router->get('/key', function() {
    return \Illuminate\Support\Str::random(32);
});

Then go to /key in your browser and copy paste the key into your .env file.
Afterwards remove the route.

Obviously you could also use some random string generator online. Like this one

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