csv.js

const obj = {
  list: [
    { param1: "gasgdgasdggasd", param2: 9 },
    { param1: "gasgdgasdggasd", param2: 9 },
    { param1: "gasgdgasdggasd", param2: 9 },
    { param1: "gasgdgasdggasd", param2: 9 },
    { param1: "gasgdgasdggasd", param2: 9 },
  ],
};

var str = "";

str =
  str +
  Object.keys(obj.list[0]).map((e2, i2, a2) => {
    return `${e2}`;
  }).join(';');
str = `${str} \n`;
str =
  str +
  obj.list.map((e, i, a) => {
    let line = Object.values(e).map((e2, i2, a2) => {
      return `${e2}`;
    }).join(';');
    return `${line} \n`;
  }).join('');

console.log(str);