tasks.js

import { Headers } from "node-fetch";
import { classifyTaks } from "../../utils/classifyTaks";
import fetch from "node-fetch";

export default async function fetchTasks(req, res) {
  const url = `http://localhost:3000/api/${req.params.id}`;

  // ! IMPORTANT: A .env file should be used here for the api-key value, but for the sake of this example, I'm using a hardcoded value.
  const headers = new Headers();
  headers.append("api-key", "globus");

  const requestOptions = {
    method: "GET",
    headers: headers,
    redirect: "follow",
  };

  try {
    const result = await fetch(url, requestOptions).then((res) => res.json());
    const classifiedTasks = await classifyTaks(result.DATA);
    const sorted = await classifiedTasks.sort(function (a, b) {
      if (a.secondaryId === 0 || b.secondaryId === 1 || a.secondaryId === 1 || b.secondaryId === 0) {
        return a.secondaryId - b.secondaryId;
      } else {
        const dateA = new Date(a.end_date);
        const dateB = new Date(b.end_date);

        return dateA - dateB;
      }
    });

    console.log("sorted: ", sorted);
    res.status(200).json(classifiedTasks);
  } catch (err) {
    const error = new Error("An error ocurred while fetching the data");
    error.status = res.status;
    error.info = await res.json();
    throw error;
  }
}

Line 21 where I'm implemeting .sort() is not sorting.