index.js

// contents of NIFTY.json

[
    17861.5,
    17890,
    17613.15,
    17900
  ]


// index.js begins

const get_prediction = () => {
   pre = fetch('./NIFTY.json')
    .then((response) => {
      response.json();
    })
    .then((data) => {
      return data;
    });
    return pre
    } 

// following should return the array stored in the json file
pre = get_prediction()
console.log(pre)