Add middleware to set Content-type to application/json on all API requests

app/Http/Middleware/JsonResponse.php

@@ -0,0 +1,18 @@
+<?php
+/**
+ * Set the content type in the API layer
+ */
+
+namespace App\Http\Middleware;
+
+use Closure;
+
+class JsonResponse
+{
+    public function handle($request, Closure $next)
+    {
+        $response = $next($request);
+        $response->headers->set('Content-Type', 'application/json');
+        return $response;
+    }
+}