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Can't access Array or Object?

I cant render results from server onto page in react.

import React, {useState} from 'react';
import getJson from "../helperFunctions/getJson";

const JobListings = () => {
  const [listOfJobs, setListofJobs] = useState("");

  const func = () => {
    getJson("/postajob").then(res => {

  console.log(typeof listOfJobs); // returns object
  console.log(listOfJobs) // return (2) [{…}, {…}]

  // let result = Object.keys(listOfJobs).map(function(key) {
  //   return [Number(key), listOfJobs[key]];
  // });

  // console.log(result);

  return (
      <h1>Job Listings Below</h1>
      <button onClick={func}>click here to show jobs</button>

export default JobListings;