Encoding Javascript Object to Json string

Question

I want to encode a Javascript object into a JSON string and I am having considerable difficulties.

The Object looks something like this

new_tweets[k]['tweet_id'] = 98745521;
new_tweets[k]['user_id'] = 54875;       
new_tweets[k]['data']['in_reply_to_screen_name'] = "other_user";
new_tweets[k]['data']['text'] = "tweet text";

I want to get this into a JSON string to put it into an ajax request.

{'k':{'tweet_id':98745521,'user_id':54875, 'data':{...}}}

you get the picture. No matter what I do, it just doesn't work. All the JSON encoders like json2 and such produce

[]

Well, that does not help me. Basically I would like to have something like the php encodejson function.

what did you actually try? please provide some code of your trials... — user57508
– user57508, Commented Jul 24, 2011 at 22:15

Community · Accepted Answer · 2013-06-27 08:36:02Z

162

Unless the variable k is defined, that's probably what's causing your trouble. Something like this will do what you want:

var new_tweets = { };

new_tweets.k = { };

new_tweets.k.tweet_id = 98745521;
new_tweets.k.user_id = 54875;

new_tweets.k.data = { };

new_tweets.k.data.in_reply_to_screen_name = 'other_user';
new_tweets.k.data.text = 'tweet text';

// Will create the JSON string you're looking for.
var json = JSON.stringify(new_tweets);

You can also do it all at once:

var new_tweets = {
  k: {
    tweet_id: 98745521,
    user_id: 54875,
    data: {
      in_reply_to_screen_name: 'other_user',
      text: 'tweet_text'
    }
  }
}

edited Jun 27, 2013 at 8:36

CommunityBot

11 silver badge

answered Jul 24, 2011 at 22:15

Dave Ward

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5 Comments

Lukas Oppermann Over a year ago

You are a genius. Thank you very much. The k was defined. The problem was me being stupid using new Array() instead of an object {}.

equiman Over a year ago

Works perfect... I make a test and result are awesome. Thanks.

console.info(json); console.log(new_tweets["k"]); console.log(new_tweets["k"]["user_id"]); console.log(new_tweets["k"]["data"]["text"]);

ashes999 Over a year ago

After all this time reading about CORS and Chrome security, this is a simple and effective way to encode JSON data. A very well-deserved +1

Dave Ward Over a year ago

@TomášZato: Why specifically would it be? JSON.stringify predates PHP's json_encode, if that's what you're alluding to.

Tomáš Zato Over a year ago

Yes, that was what I was thinking. I found out about JSON very recently. In past, I used eval to parse JSON responses. I was happy the eval will be gon from my code.

ashleedawg · Accepted Answer · 2019-08-25 09:51:12Z

16

You can use JSON.stringify like:

JSON.stringify(new_tweets);

edited Aug 25, 2019 at 9:51

ashleedawg

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answered Dec 5, 2015 at 9:45

Luca C.

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