How to parse JSON in node js

Question

I have this JSON array, and what I want is to get the password field alone

var user = [ { _id: 5902086ecbc0dd11e4870fd9,
    password: '$2a$08$FIpkmFT1WDZggQYyBA4CVuop6pelbKBfUEJ1/KAVIV2Si9Ho1EYhi',
    email: 'jv100@gmail.com',
    lastName: 'v',
    firstName: 'j',
    updatedDate: 2017-04-27T15:04:14.483Z,
    createdDate: 2017-04-27T15:04:14.483Z } ]

I tried to parse it using this code

var obj = JSON.parse(user);
console.log(user.password);

but still it is undefined.

It doesn't need parsing. It's already an array. And since it's an array of objects you'll have to use it like this: `user[ index ].password;` (`user[0].password;` for the first object ...). — ibrahim mahrir, Apr 27 '17 at 15:56
Possible duplicate of [What's the difference between Javascript Object and JSON object](http://stackoverflow.com/questions/6489783/whats-the-difference-between-javascript-object-and-json-object) — Álvaro González, Apr 27 '17 at 15:58
Possible duplicate of [Access / process (nested) objects, arrays or JSON](http://stackoverflow.com/questions/11922383/access-process-nested-objects-arrays-or-json) — Heretic Monkey, Apr 27 '17 at 15:58
actually that is what I received from my db (I'm using moongose for that), and I dont know how will I get the password field. thanks for the response, it helps — JerVi, Apr 27 '17 at 15:58
Then I don't think you've posted real code. If you are getting data from a database you cannot have a fragment of JavaScript code with an array literal, unless of course your database wrapper decodes it for you. In either case, it's unlikely we can offer help. — Álvaro González, Apr 27 '17 at 16:27

Peter LaBanca · Accepted Answer · 2021-06-01T18:53:09.307

4

User is already a list of objects, so you don't need to parse it. However, it is an array. So if you meant for it to be an array, you'd need to access the password by using this code:

console.log(user[0].password);

edited Jun 01 '21 at 18:53

answered Apr 27 '17 at 15:58

Peter LaBanca

475
3
9

2

`user` is already an array of objects not JSON. JSON is a string representation of objects. – ibrahim mahrir Apr 27 '17 at 15:59
yes it solved my problem. sorry for noob question question. Im newby for nodejs. thanks alot – JerVi Apr 27 '17 at 16:01
1

I fixed my answer to clarify that change @ibrahimmahrir – Peter LaBanca Jun 01 '21 at 18:53
@PeterLaBanca a response after 4 years, 1 month and 6 days haha. Better late than never :-) – ibrahim mahrir Jun 02 '21 at 01:03

score 2 · Answer 2 · answered Apr 27 '17 at 15:59

It's already an array there is nothing to parse. You can access your property via :

console.log(user[0].password);

You can't access your property with user.password because user variable is not object, it's an array, your object is stored at the zero index of your array.

score 2 · Answer 3 · answered Apr 28 '17 at 08:26

You already have JSON object. hence, no need to parse it again.

DEMO

var user = [{ _id: "5902086ecbc0dd11e4870fd9",
    password: '$2a$08$FIpkmFT1WDZggQYyBA4CVuop6pelbKBfUEJ1/KAVIV2Si9Ho1EYhi',
    email: 'jv100@gmail.com',
    lastName: 'v',
    firstName: 'j',
    updatedDate: "2017-04-27T15:04:14.483Z",
    createdDate: "2017-04-27T15:04:14.483Z" } ];
    
var password = user[0].password;

console.log(password);

score 1 · Answer 4 · answered Apr 27 '17 at 16:11

The variable 'user' is not a JSON array. It's an array with a single Javascript object as its element. JSON.parse(arg) can only be used to parse a JSON string to a plain Javascript object. That being said, to access the javascript object within the array, you can do:

var userData = user[0];

To access the password within the variable, userData, you can do:

var password = userData.password;

Log the password to the console with:

console.log(password);

score 1 · Answer 5 · answered Apr 27 '17 at 16:13

Try This:

var user = [ {_id:'5902086ecbc0dd11e4870fd9',password: '$2a$08$FIpkmFT1WDZggQYyBA4CVuop6pelbKBfUEJ1/KAVIV2Si9Ho1EYhi',email: 'jv100@gmail.com',lastName: 'v',firstName: 'j',updatedDate: '2017-04-27T15:04:14.483Z',createdDate:' 2017-04-27T15:04:14.483Z' } ];

var obj = user[0];
console.log(obj.password);

How to parse JSON in node js

5 Answers5