//Controller and method

public function store(Request $request)
    {
        $user = Sentinel::getUser();
        $plan = new Plan();
        $plan->plan_start = $request->plan_start;
        $plan->part_id = $request->part_id;
        $plan->exercise_id = $request->exercise_id;
        $plan->weight = $request->weight;
        $plan->series = $request->series;
        $plan->repeat = $request->repeat;
        $plan->time = $request->time;

        $user->plans()->save($plan);
        return response()->json(['plan' => $plan], 202);
    }

//app.js

validation working when send form is problem
POST http://localhost:3000/klient/plany/zapisz 500 (Internal Server Error)

validateBeforeSubmit: function() {
                this.$validator.updateDictionary({
                    pl: {
                        attributes: {
                            repeat: 'powtórzenia',
                            weight: 'ciężar',
                            time: 'czas',
                        }
                    }
                })
                this.$validator.setLocale('pl')

				// this could be error

				this.$validator.validateAll().then(() => {
                    // Data is valid, so we can submit the form.
                    this.submitForm()
            }).catch(() => {
                    return false
                })

				//
        },
        submitForm:function(){
            axios.post('/klient/plany/zapisz')
                .then(function (response) {
                    console.log(response);
                })
                .catch(function (error) {
                    console.log(error);
                });
            }
        }