How to parse JSON in JavaScript to take value

Question

I am really stuck in parsing a JSON string and take it's values. I got the JSON string as

{"user":{"id":"1","firstname":"Freelogin","created":"0000-00-00 00:00:00","lastname":"Administrator","email":"fred@websecurify.com", "usergroup_id":"1","status":"1","ip_enable":"N","priv":"0","expire":""},"data":{ "1":{"5":{"last_update":"2010-12-13 16:16:16","status":"0"},"3":{"last_update":"2010-12-13 16:41:48","status":"1"}},"2":{"6":{"last_update":"2010-12-13 16:41:48","status":"1"}}},"server_array":[{"id":"1","name":"anes.yyy.net"},{ "id":"2","name":"neseema.xxx.net"}],"service_array":[{"id":"5","name":"POP3"}, {"id":"6","name":"Cpanel"},{"id":"3","name":"SMTP"}],"sort_by":"servername", "sort_order":"ASC","pagelinks":"","totrows":"2","offset":"0","limitvalue":"10", "rows_monitor":2,"current":"monitor","uri":false}

How to Parse this and take the Results for further processing in JavaScript

Answer 1

You should use jQuery.parseJSON . It will use native JSON if available, and only use eval if necessary, after a sanity check.

Answer 2

使用JSON.parse （从http://json.org重定向），或者MDN

Answer 3

Json is already some javascript. so parsing is just using eval

like:

 var foobar = eval(yourjson);
 alert(foobar.user);

Also jquery has some function for it jquery.parseJSON

like:

   var foobar = $.parseJSON(yourjson);

Jquery is better because it would make some checks and perform better.

Answer 4

First, download jQuery .

Second, include it in your page.

Third, if your variable is this:

var jsonString = '{"user":{"id":"1","firstname":"Freelogin","created":"0000-00-00 00:00:00","lastname":"Administrator","email":"fred@websecurify.com", "usergroup_id":"1","status":"1","ip_enable":"N","priv":"0","expire":""},"data":{ "1":{"5":{"last_update":"2010-12-13 16:16:16","status":"0"},"3":{"last_update":"2010-12-13 16:41:48","status":"1"}},"2":{"6":{"last_update":"2010-12-13 16:41:48","status":"1"}}},"server_array":[{"id":"1","name":"anes.yyy.net"},{ "id":"2","name":"neseema.xxx.net"}],"service_array":[{"id":"5","name":"POP3"}, {"id":"6","name":"Cpanel"},{"id":"3","name":"SMTP"}],"sort_by":"servername", "sort_order":"ASC","pagelinks":"","totrows":"2","offset":"0","limitvalue":"10", "rows_monitor":2,"current":"monitor","uri":false}';

then,

var parsedJson = jQuery.parseJSON(jsonString);

will give you the desired parsed object that's ready for manipulation.

I tried out your JSON string on JSONLint and it says it's valid, so you should have no problems with it.

Answer 5

you probably got your json in som String variable

var json = '{"user":{"id":"1","firstname":"Freelogin","created":"0000-00-00 00:00:00","lastname":"Administrator","email":"fred@websecurify.com", "usergroup_id":"1","status":"1","ip_enable":"N","priv":"0","expire":""},"data":{ "1":{"5":{"last_update":"2010-12-13 16:16:16","status":"0"},"3":{"last_update":"2010-12-13 16:41:48","status":"1"}},"2":{"6":{"last_update":"2010-12-13 16:41:48","status":"1"}}},"server_array":[{"id":"1","name":"anes.yyy.net"},{ "id":"2","name":"neseema.xxx.net"}],"service_array":[{"id":"5","name":"POP3"}, {"id":"6","name":"Cpanel"},{"id":"3","name":"SMTP"}],"sort_by":"servername", "sort_order":"ASC","pagelinks":"","totrows":"2","offset":"0","limitvalue":"10", "rows_monitor":2,"current":"monitor","uri":false}';

now you can easily parse it via jQuery (you also can parse it via native javaScript eval, but there are some security issues, badly formated input string fe, that is covered with jQuery and not in eval)

result = jQuery.parseJSON(json);

Now you can easily acces your json object

alert('Hello user, your name is ' + json.user.firstname);

Answer 6

You don't need jQuery, in ECMAScript5 JSON object will be supported natively and with it you can use JSON.parse method to parse a string into a JS object. IE9 will support ES5 and FF and Chrome already do.

For the moment you can use json2.js (you can look at the source here ) as fallback for the browsers that don't support JSON natively.