Laravel use Request validation with api

I’m trying to implement validation in my api like this:

public function store(RideUpdateRequest $request)
    {
        $user = JWTAuth::parseToken()->authenticate();

        $ride = Ride::create([
            'user_id'       => $user->id,
            'time'          => $request->time,
            'date'          => $request->date,
            'type_id'       => $request->type_id,
            'location_id'   => $request->location_id,
            'billabletime'  => $request->billabletime
        ]);

        $ride->save();

        return response()->json(['success' => 'Rit succesvol aangemaakt.'], 200);
    }

RideUpdateRequest:

 public function rules()
    {
        return [
            'time'             =>  'required|integer',
            'date'             =>  'required|date',
            'type_id'          =>  'required|integer',
            'location_id'      =>  'required|integer',
            'billabletime'     =>  'required|integer'
        ];
    }

So how could I give a error message back in json (if the request validation fails)? Right now in postman I receive nothing back?

–EDIT–

response:

{
  "billabletime": [
    "The billabletime field is required."
  ]
}

Could I get something like this?:

    {
      "error": {
        "The billabletime field is required."
      }
    }

Answer

If you take a look at the FormRequest class, you’ll see a response() method defined as something like:

public function response(array $errors)
{
    if ($this->expectsJson()) {
        return new JsonResponse($errors, 422);
    }
    ...
}

So you can either set an Accept: aplication/json request header to comply with the expectsJson condition, or force the default response behavior by sepcifying the response() method in your own RideUpdateRequest class:

public function response(array $errors)
{
    // Always return JSON.
    return response()->json($errors, 422);
}