Creating JSON in javascript

Question

How should I encode this data as JSON in javascript?

I use javascript to get an arbitrary number of 'tags' on photos. Each tag has a firstname and a lastname in this form:

firstname = 'john';
lastname  = 'doe';

firstname = 'jane';
lastname  = 'smith';

I want to encode this data as JSON, send it to my server with Ajax, and decode it in PHP.

My thought was to create a multidimensional array. Is there a better way to do this?

The output of JSON.stringify() is [{\"firstname\":\"John\",\"lastname\":\"Doe\"},{\"firstname\":\"Jane\",\"lastname\":\"Smith\"}]. How can I have JSON.stringify() not escape all of the quotes?

Unless youre using an API the requires you to send a request in JSON its much easier just send a standard post to the server. — prodigitalson
– prodigitalson, Commented Dec 25, 2012 at 3:11
I'm using FormData, so unfortunately it has to be sent as JSON — Don P
– Don P, Commented Dec 25, 2012 at 3:11
Curious, you've tagged the question as [json] and [stringify] but apparently JSON.stringify() is the one thing you've not tried. — Tomalak
– Tomalak, Commented Dec 25, 2012 at 3:13
I was trying JSON.stringify(), and it seems to format my data incorrectly, so I figured I'd check here. — Don P
– Don P, Commented Dec 25, 2012 at 3:13

elclanrs · Accepted Answer · 2012-12-25 03:10:38Z

4

JSON is inspired by JavaScript's object syntax, so all you need to do is create an array of objects:

var data = [
  {
    firstname: 'john',
    lastname: 'doe'
  },
  {
    firstname: 'jane',
    lastname: 'smith'
  }
]

var json = JSON.stringify( data ); // send this object to server

answered Dec 25, 2012 at 3:10

elclanrs

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3 Comments

user166390 Over a year ago

Note: JSON.stringify/JSON.parse require a shim on IE7 (ick!) and before.

Don P Over a year ago

When I do this I end up with [{"firstname":"John","lastname":"Doe"},{"firstname":"Jane","lastname":"Smith"}], and it seems that PHP's json_decode can't get a result out of this

Don P Over a year ago

The output of JSON.stringify() is [{\"firstname\":\"John\",\"lastname\":\"Doe\"},{\"firstname\":\"Jane\",\"lastname\":\"Smith\"}]. How can I have JSON.stringify() not escape all of the quotes?

cjds · Accepted Answer · 2012-12-25 03:37:49Z

1

JSON is the way to go

JAVASCRIPT

 var data = [{
    firstname: 'john',
    lastname: 'doe'
    },
    {
    firstname: 'jane',
    lastname: 'smith'
   }
 ]

var json = JSON.stringify( data );

Now your JSON string will be

[{"firstname":"John","lastname":"Doe"},{"firstname":"Jane","lastname":"Smith"}]

PHP

$arr=json_decode('$jsonVar');

Make sure you put the single quotes cover on the php side. Otherwise PHP won't read this as a string

answered Dec 25, 2012 at 3:37

cjds

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1 Comment

Don P Over a year ago

I'm pretty sure you don't have to wrap it in single quotes. Why would you need to do this? It's supposed to be evaluating the value of the variable, not reading the string.

Manish · Accepted Answer · 2012-12-25 03:18:55Z

0

you can convert your tags into json object

var jsonObj = '{"TeamList" : [{"teamid" : "1","teamname" : "Barcelona"}]}';
var obj = $.parseJSON(jsonObj);

or

 var jsonObj = {
"employees": [
{ "firstName":"John" , "lastName":"Doe" }, 
{ "firstName":"Anna" , "lastName":"Smith" }, 
{ "firstName":"Peter" , "lastName":"Jones" }
]
}
var obj = $.parseJSON(jsonObj);

answered Dec 25, 2012 at 3:18

Manish

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