Parse json response in nodejs

Question

I am beginner and learning javascript and never came across parsing json array. I have following string

[{"_id":"5810abfec95a8743ec237fab","credentials":[{"_id":"5810abfec95a8743ec237fab","username":"sam"}]}]

I tried following,

     //using following middle-ware as well
     let app = express();
     const collectioName = "credentials";
     app.use(bodyParser.json());
     app.use(express.static(__dirname + '/public'));

     //i get 'result' from one of query from mongodb
     let response = JSON.parse(result);
     console.log("got res " +response.credentials);

I also tried to get data in following way

 for (var i=0; i<response['credentials'].length; i++){
       console.log("got res " +response['credentials'][i]);
   }

I need to get the username and its value from above json response. I want to know what is correct way to get data from such json response.

Please suggest

You JSON is an array, so probably all your accesses will start with response[0].credentials. — Sirko
– Sirko, Commented Nov 3, 2016 at 6:26
When i tried response[0].credentials it gave me output as ` [object Object]` . — Sohan
– Sohan, Commented Nov 3, 2016 at 6:28
Because this again is an array, which you have to access basically in the same way. — Sirko
– Sirko, Commented Nov 3, 2016 at 6:50

Sohan · Accepted Answer · 2016-11-03 07:10:59Z

3

After looking at above answer i got some clue and i think this should work as well, this save time of iteration for me as the datastructure will return only one json object for respective credentials match (as same credentials cannot be there in DB).

   let response = JSON.parse(result);
   var data=response[0].credentials;
   let username = data[0].username;
   let password = data[0].password;
   console.log("username : " +username + "password : " +password );

answered Nov 3, 2016 at 7:10

Sohan

6,8796 gold badges40 silver badges59 bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

Mihai Alexandru-Ionut Over a year ago

Yes..if you have only one user, there's no need to iterate.

Mihai Alexandru-Ionut Over a year ago

A simpler method is here : jsfiddle.net/j7ya1L97/3 .You must return json without array.

Mihai Alexandru-Ionut · Accepted Answer · 2016-11-03 06:43:07Z

1

Please try this:

var data=response[0].credentials;
for (var i=0; i<data.length; i++){
  console.log(data[i]._id);
  console.log(data[i].username);
}

Here is jsfiddle

answered Nov 3, 2016 at 6:43

Mihai Alexandru-Ionut

48.6k14 gold badges106 silver badges132 bronze badges

3 Comments

Sohan Over a year ago

It works, so is this the most efficient way to access data?

Mihai Alexandru-Ionut Over a year ago

@Sohan,yes,because we have an array called credentials and must to iterate it.

Mihai Alexandru-Ionut Over a year ago

@Sohan, another method is using forEach function. Here is an solution: jsfiddle.net/j7ya1L97/2

Collectives™ on Stack Overflow

Parse json response in nodejs

2 Answers 2

2 Comments

3 Comments

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

2 Comments

3 Comments

Related