Validate request to api

Hi all. I have a rest full api. So I want to validate via DI my request.

I have a request look like this

<?php

namespace App\Http\Requests;

use Illuminate\Foundation\Http\FormRequest;

class DownloadRequest extends FormRequest
{
    /**
     * Determine if the user is authorized to make this request.
     *
     * @return bool
     */
    public function authorize()
    {
        return true;
    }

    /**
     * Get the validation rules that apply to the request.
     *
     * @return array
     */
    public function rules()
    {
        return [
            'url' => 'required'
        ];
    }
}

In my controller I have a code look like this

public function store(DownloadRequest $request){
       
       // my logic here

   }

But its not working. Also I want to validate my web form request by this DownlaodRequest . Please help me to solve this problem