JSON string to JS object

Question

I am using a JS object to create graphs with Google visualization  I am trying to design the data source  At first  I created a JS object client-side     var JSONObject       cols           id   date         label   Date         type   date                     id   soldpencils         label   Sold Pencils         type   number                     id   soldpens         label   Sold Pens         type   number               rows           c             v  new Date 2008  1  1           f   2 1 2008                     v  30000                    v  40645                             c             v  new Date 2008  1  2           f   2 2 2008                     v  14045                    v  20374                             c             v  new Date 2008  1  3           f   2 3 2008                     v  55022                    v  50766                        var data   new google visualization DataTable JSONObject  0 5     Now I need to fetch the data dynamically  So I send an AJAX request to a page that returns the JSON string     cols    id   date   label   Date   type   date     id   soldpencils   label   Sold Pencils   type   number     id   soldpens   label   Sold Pens   type   number       rows    c   v  new Date 2008 1 1  f  2 1 2008    v  30000    v  40645            c   v  new Date 2008 1 2  f  2 2 2008    v  14045    v  20374      c   v  new Date 2008 1 3  f  2 3 2008    v  55022    v  50766       This I save into a variable   var var1    cols    i         66       and show as   alert var1     Now my task is to create a JS object from this string  This is not working  When I use a JS object  everything works fine and I am able to get my required graph  Now if I try putting the same value of string from the AJAX request which I confirmed from a alert message into a n object  the object is not getting created correctly  Please let me know your opinion and any correction or advices

User · Answer

You can use eval jsonString  if you trust the data in the string  otherwise you ll need to parse it properly - check json org for some code samples

User · Answer

The string you are returning is not valid JSON  The names in the objects needs to be quoted and the whole string needs to be put in         to form an object  JSON also cannot contain something like new Date    JSON is just a small subset of JavaScript that has only strings  numbers  objects  arrays  true  false and null   See the JSON grammar for more information

User · Answer

Some modern browsers have support for parsing JSON into a native object   var var1      cols      i          66      var result   JSON parse var1     For the browsers that don t support it  you can download json2 js from json org for safe parsing of a JSON object   The script will check for native JSON support and if it doesn t exist  provide the JSON global object instead   If the faster  native object is available it will just exit the script leaving it intact   You must  however  provide valid JSON or it will throw an error  mdash  you can check the validity of your JSON with http   jslint com or http   jsonlint com

User · Answer

You can use this library from JSON org to translate your string into a JSON object   var var1 obj   JSON parse var1     Or you can use the jquery-json library as well   var var1 obj     toJSON var1

User · Answer

the string in your question is not a valid json string  From json org website      JSON is built on two structures     A collection of name value pairs  In various languages  this is    realized as an object  record  struct  dictionary  hash table  keyed list  or   associative array    An ordered list of values  In most languages  this is realized as an   array  vector  list  or sequence     Basically a json string will always start with either   or     Then as  Andy E and  Cryo said you can parse the string with json2 js or some other libraries   IMHO you should avoid eval because it will any javascript program  so you might incur in security issues

[javascript] JSON string to JS object

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