makeTreeByArray.js

function makeTree(list, node) {  
  const tree = [];
 
  list.forEach((item) => { 
    if (item.parent_id !== null) {
      if(list[item.parent_id-1]["children"] === undefined){
        list[item.parent_id-1].children = [];
      }
      list[item.parent_id-1].children.push(item);
    } else {
      tree.push(item);
    }
  });

  console.log(tree);
}