Only get part of the SharePoint list with JavaScript Fetch

I have a problem with getting all SP list item (257 currently) with fetch.

I have the following code:

var tasks = new Request(
        webUrl + "/_api/web/lists/GetByTitle('" + listName + "')/items?$top=300"
    , {
        method: "GET",
        credentials: 'same-origin',    
        headers: new Headers({
            "Accept": "application/json; odata=nometadata",
        })
    });


    fetch(tasks)
        .then((response) => response.json())
        .then((data) => {
            let items = data.value;
            console.log('Van: ' + data["@odata.nextLink"])
            items.forEach((item) => {
                console.log(item.ID,item.Title,item.Program);
            });
        });

Without the top=300 part it is only listing 131 item. And it wont work with a list with 1000+ row.

The odata.nextLink is undefined. So it seems I don't get that. How can I get all data?