Error occured while storing data to file SyntaxError: Unexpected end of JSON input

Question

I need help with this error:

Error occured while storing data to file SyntaxError: Unexpected end of JSON input
    at JSON.parse (<anonymous>)
    at storeDataToFile (C:\Users\alaiy\Documents\NFTs\nft-demo-master\scripts\ipfsHelper.js:19:23)
    at async pinFileToIPFS (C:\Users\alaiy\Documents\NFTs\nft-demo-master\scripts\pinFileToIPFS.js:29:5)
Successfully added IPFS response to json file

I'm using the following scripts to upload an image to a IPFS site (Pinata) and then add the IPFS hash to either new/existing json file. Any help is appreciated!

I've got my dev.json file which basically says to add the hash to the ipfsHash.json file. If not then create one and add:

    {
        "ipfsFile": {
            "location": "../data/ipfsHash.json"
          }
    }

I've got my runScript.js file which basically calls the pinFiletoIPFS file below:

    const path = require('path');
    const pinFileToIPFS = require('./pinFileToIPFS');
    
    const filePath = path.join(__dirname, '../assets/homer.jpg');
    // const filePath = path.join(__dirname, '../data/metadata.json');
    
    pinFileToIPFS(filePath);

This is the script that is having issues. I have the ipfsHelp.js file which should add the data to my json file:

const fs = require('fs').promises;
const path = require('path');
const config = require('config');

// https://stackoverflow.com/questions/36856232/write-add-data-in-json-file-using-node-js
// Accepts json data and stores in specified filePath.
// If the file does not exists in specified location, it creates it
const storeDataToFile = async (jsonData) => {
  try {
    const filePath = path.join(__dirname, config.get('ipfsFile.location'));
    const ipfsFileExists = await fileExists(filePath);
    if (!ipfsFileExists) {
      console.log('ipfsFileExists: ', ipfsFileExists);
      // First time creating an empty file with [].
      // We will be storing all ipfsHashes as array of objects
      await fs.writeFile(filePath, JSON.stringify([]));
    }
    const data = await fs.readFile(filePath, 'utf8');
    const json = JSON.parse(data);
    json.push(jsonData);
    await fs.writeFile(filePath, JSON.stringify(json));
  } catch (err) {
    console.log('Error occured while storing data to file', err);
  }
};

async function fileExists(path) {
  try {
    const res = await fs.access(path);
    return true;
  } catch (err) {
    // no such file or directory. File really does not exist
    if (err.code == 'ENOENT') {
      return false;
    }
    console.log('Exception fs.statSync (' + path + '): ' + err);
    // some other exception occurred
    throw err;
  }
}

module.exports = {
  storeDataToFile,
  fileExists,
};

I've used this module: https://www.npmjs.com/package/config

I have a config folder in my root folder where the json file is inside.

Not sure what i'm doing wrong.

EDITTT:

I FOUND THE SOLUTIO thanks to Why is process.env.NODE_ENV undefined?

The code was not working all because I have to type the following in cmd which sets the variable in the environment!! :

SET NODE_ENV=dev