CODEWITHSUNDEEP
jsonnode.jsmongodbexpressmongoose
Chris Paterson
Chris Paterson

Reputation: 1149

How can I loop through an array of JSON objects?

I have JSON data that I need to loop through. The data is in a file titled "people.json" that is structured as listed below:

[{"firstname":"John","lastname":"Smith","age":"40"},{"firstname":"Bill","lastname":"Jones","age":"40"}, ...]

I want to read each object in this file and save it (I'm using Mongoose). Here is what I have so far:

var fs = require('fs');
var Person = require('../models/people');

fs.readFile('./people.json', 'utf8', function (err,data) {
    var i;
    for(i = 0; i < data.length; i++) {
        var newPerson = new Person();
        newPerson.firstname = data[i].firstname;
        newPerson.lastname = data[i].lastname;
        newPerson.age = data[i].age;
        newPerson.save(function (err) {});
    }
});

I'm unable to get this to work though. What am I doing wrong?

Upvotes: 14

Views: 51315

Answers (3)

Hossein Safari
Hossein Safari

Reputation: 379

const parsedData = JSON.parse(JSON.stringify(data));

Upvotes: 0

hedzr
hedzr

Reputation: 183

ES6 for..of can do that too.

fs.readFile('./people.json', 'utf8', function (err,data) {
  for(var item of data) {
     console.log('item: ', [item.firstname, ...]);
  }
});

Upvotes: 12

Ibrahim
Ibrahim

Reputation: 847

fs.readFile('./people.json', 'utf8', function (err,data) {
  data = JSON.parse(data); // you missed that...
  for(var i = 0; i < data.length; i++) {
    var newPerson = new Person();
    newPerson.firstname = data[i].firstname;
    newPerson.lastname = data[i].lastname;
    newPerson.age = data[i].age;
    newPerson.save(function (err) {});
  }
});

Upvotes: 33

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