Print content of JavaScript object

Question

Typically if we just use alert object   it will show as  object Object    How to print all the content parameters of an object in JavaScript

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You can give your objects their own toString methods in their prototypes

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If you just want to have a string representation of an object  you could use the JSON stringify function  using a JSON library

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You should consider using FireBug for JavaScript debugging  It will let you interactively inspect all of your variables  and even step through functions

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Internet Explorer 8 has developer tools which is similar to Firebug for Firefox  Opera has Opera DragonFly  and Google Chrome also has something called Developer Tools  Shift Ctrl J    Here is more a more detailed answer to debug JavaScript in IE6-8  Using the IE8   39 Developer Tools  39  to debug earlier IE versions

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This will give you very nice output with indented JSON object  alert JSON stringify YOUR OBJECT HERE  null  4     The second argument alters the contents of the string before returning it  The third argument specifies how many spaces to use as white space for readability

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You could Node s util inspect object  to print out object s structure    It is especially helpful when your object has circular dependencies e g     node  var obj         name     John       surname     Doe    obj self ref   obj   util   require  util     var obj str   util inspect obj   console log obj str      prints   name   John   surname   Doe   self ref   Circular      It that case JSON stringify throws exception  TypeError  Converting circular structure to JSON

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Simple function to alert contents of an object or an array   Call this function with an array or string or an object it alerts the contents   Function  function print r printthis  returnoutput        var output            if   isArray printthis     typeof printthis      object             for var i in printthis                output    i           print r printthis i   true      n                  else           output    printthis            if returnoutput  amp  amp  returnoutput    true            return output       else           alert output             Usage  var data    1  2  3  4   print r data

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Javascript for all   String prototype repeat   function num        if  num  lt  0            return           else           return new Array num   1  join this             function is defined x        return typeof x      undefined      function is object x        return Object prototype toString call x        object Object       function is array x        return Object prototype toString call x        object Array              Main      function xlog v  label        var tab   0       var rt   function             return        repeat tab                  Log Fn     var lg   function x               Limit         if  tab  gt  10  return                  var r               if   is defined x                 r     VAR  UNDEFINED              else if  x                       r     VAR  EMPTY STRING              else if  is array x                 r      n               tab                for  var k in x                    r    rt     k           lg x k        n                             tab--              r    rt                    else if  is object x                 r      n               tab                for  var k in x                    r    rt     k           lg x k        n                             tab--              r    rt                    else               r   x                    return r                 Space     document write   n n            Log     document write   lt       is defined label     label                Object prototype toString call v       gt  n    lg v             Demo     var o          aaa    123       bbb     zzzz        o               obj1     val1            obj2     val2            obj3     1  3  5  6            obj4                   a     aaaa                b    null                       a       asd   123  false  true         func    function             alert  test                fff    false       t    true       nnn    null     xlog o   Object       With label xlog o      Without label  xlog   asd    bbb   123  true    ARRAY Title      var no definido  xlog no definido   Undefined      xlog true    xlog      Empty String

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I faced similar problem  The reason for it was i make use of ajax to fetch data  In this case i had made two asynchronous ajax call  In one i just return string msg and show in alert  In second ajax call i fetch arraylist in json format and decode it in js  So my second request use to process first and i was getting alert of object   So just check  1  alert should contain string  2  If u get arrayList or any other Object decode it   All the best

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Aside from using a debugger  you can also access all elements of an object using a foreach loop  The following printObject function should alert   your object showing all properties and respective values   function printObject o      var out         for  var p in o        out    p          o p      n         alert out         now test it  var myObject     something   1   other thing   2   printObject myObject     Using a DOM inspection tool is preferable because it allows you to dig under the properties that are objects themselves  Firefox has FireBug but all other major browsers  IE  Chrome  Safari  also have debugging tools built-in that you should check

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You can use json js from http   www json org js html to change json data to string data

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Print content of object you can use  console log obj str     you can see the result in console like below   Object  description   test      For open console press F12 in chrome browser  you will found console tab in debug mode

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If you are using Firefox  alert object toSource    should suffice for simple debugging purposes

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Use dir object   Or you can always download Firebug for Firefox  really helpful

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You can also use Prototype s Object inspect   method  which  Returns the debug-oriented string representation of the object    http   api prototypejs org language Object inspect

[javascript] Print content of JavaScript object?

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