Trim and convert strings to nulls.

app/Http/Kernel.php

@@ -16,6 +16,8 @@ class Kernel extends HttpKernel
     protected $middleware = [
         \Illuminate\Foundation\Http\Middleware\CheckForMaintenanceMode::class,
         \Illuminate\Foundation\Http\Middleware\ValidatePostSize::class,
+        \App\Http\Middleware\TrimStrings::class,
+        \Illuminate\Foundation\Http\Middleware\ConvertEmptyStringsToNull::class,
     ];
 
     /**

app/Http/Middleware/TrimStrings.php

@@ -0,0 +1,18 @@
+<?php
+
+namespace App\Http\Middleware;
+
+use Illuminate\Foundation\Http\Middleware\TrimStrings as BaseTrimmer;
+
+class TrimStrings extends BaseTrimmer
+{
+    /**
+     * The names of the attributes that should not be trimmed.
+     *
+     * @var array
+     */
+    protected $except = [
+        'password',
+        'password_confirmation',
+    ];
+}