JSON structure for form-data in Laravel API

Please provide more information to your problem.

I'm sorry, I forgot to add this links for the controller: https://drive.google.com/open?id=1wBJj32yGBNGMDnZVu6bLnRMKoJbcBX2H

How should the JSON from client be structured to map to that?

Try sending some as test, as long as it's properly formatted Json. The trick will be decoding and looping over it properly once received.

I have tried lots of tests but none works because I don't understand what the Laravel API wants from the client side.

Well the docs show a normal array prior to being json: From docs.

    public function toArray($request)
    {
        return [
            'id' => $this->id,
            'name' => $this->name,
            'email' => $this->email,
            'created_at' => $this->created_at,
            'updated_at' => $this->updated_at,
        ];
    }

And docs say:

Every resource class defines a toArray method which returns the array of attributes that should be converted to JSON when sending the response.

So sending or receiving you have to have well formed array to get well formed Json.

You receive the data through an api route, then do whatever you need to do with it.

Find this line Retrieving JSON Input Values

Here: https://laravel.com/docs/5.7/requests

Thanks everyone. I found the solution by appending FormData of the file data. Sorry I was not able to communicate the issue well. Thanks again.