Laravel | PHP | How to use file_get_contents?

I want to learn and to understand how can i use data, sent from an external server into my laravel project.

So i made this route :

Route::get('/receive','MyController@Receive');

And in Controller i did that :

 public function Receive(Request $request){
     $data = file_get_contents("php://input");
     $json_dat = json_decode($data, true);
     echo $json_dat;
 }

Using POSTMAN, i sent i POST request to `http://my_domain/receive

With Body > Row > JSON APP And a simple table like that : `

[{
    "type_3": "Hero",
 }]

When executing the URL in Postman, nothing happens in echo $json_dat

What I'm expecting is : Json data with type_3 : Hero

Thank you in advance

via Chebli Mohamed