Fetch API cannot load localhost:3000/send. URL scheme "localhost" is not supported

I am using Node Js as backend and basic html css js for frontend. I am sending request through node js that

app.get("/send", async (req, res) => {
  let products = await Product.find();
  products = await products;
  res.send(products);
});

and getting fetch on an html page:

const getData = async () => {
    const response = await fetch("localhost:3000/send", {
      method: "GET",
    });
    const data = await response.json();
    console.log(data);
  };
  getData();

But i am not getting the data, I have tested the api on Postman it works fine there. But throwing error on browser:

Error is :

Fetch API cannot load localhost:3000/send. URL scheme "localhost" is not supported.

Please help me out. Bundles of thanks!