retrieve data from JSON file

Question

retrieve data from JSON file

function retrieveDataFromProfiles(){
  const fs = require('fs')
  fs.readFile('src/data/profileInfo.json', function(error, data){
    if(error){
    alert(error);
   }
  var profileData = JSON.parse(data);
  //retrieves the JSON data of profiles
  return profileData;
 });
}

I am attempting to extract the JSON data from this function and assign it to a variable in another function. However, I am uncertain about the correct method to achieve this, as the traditional return approach is not effective. I have been advised to utilize either a promise or async function, but I lack clarity on how to proceed with that.

javascript json

Answer 1

Answer №1

Make sure to return a Promise from the function, and resolve it after reading the JSON data.

function retrieveUserProfiles() {
  const fs = require("fs");
  return new Promise((resolve, reject) => {
    fs.readFile("src/data/profileInfo.json", function (err, data_array) {
      if (err) {
        // Reject if an error occurs
        reject(err);
      }
      var json = JSON.parse(data_array);
      // Resolve when data is retrieved
      resolve(json);
    });
  });
}

When calling the function, remember to use either async/await or then/catch.

retrieveUserProfiles()
  .then(json => console.log(json))
  .catch(err => alert(err)); // Display alert for errors

Answer 2

Make sure to return a Promise from the function, and resolve it after reading the JSON data.

function retrieveUserProfiles() {
  const fs = require("fs");
  return new Promise((resolve, reject) => {
    fs.readFile("src/data/profileInfo.json", function (err, data_array) {
      if (err) {
        // Reject if an error occurs
        reject(err);
      }
      var json = JSON.parse(data_array);
      // Resolve when data is retrieved
      resolve(json);
    });
  });
}

When calling the function, remember to use either async/await or then/catch.

retrieveUserProfiles()
  .then(json => console.log(json))
  .catch(err => alert(err)); // Display alert for errors

Answer 3

Answer №2

let user_profile = fs.readFileSync(__dirname + '/data/profileInfo.json',(err,data)=>{});

Parsed_user_profile = JSON.parse(user_profile)

This solution worked for me, although the previous comment also had a valid suggestion.

Answer 4

let user_profile = fs.readFileSync(__dirname + '/data/profileInfo.json',(err,data)=>{});

Parsed_user_profile = JSON.parse(user_profile)

This solution worked for me, although the previous comment also had a valid suggestion.

retrieve data from JSON file

Answer №1

Answer №2

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