fetch real life example

fetch.js

function requestBid(eventID,requestSlpAddress) {
  const url = AUCTION_BACKEND_URL;
  const data = {
      eventID: eventID,
      bidderAddress: requestSlpAddress
  };

  const jsonData = JSON.stringify(data);

  const params = {
    headers: {
        "content-type":"application/json; charset=UTF-8"
      },
      body: jsonData,
      method: "POST"
    };

    fetch(url, params)
    .then(data=>{return data.json()})
    .then(res=>{console.log('RES', res)})
    .catch(error=>console.log('ERROR', error));
}