Reverse of JSON stringify

Question

I m stringyfing an object like   foo    bar    How can I turn the string back to an object

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http   jsbin com tidob 1 edit js console output  The native JSON object includes two key methods   1  JSON parse   2  JSON stringify       The JSON parse   method parses a JSON string - i e  reconstructing the original JavaScript object  var jsObject   JSON parse jsonString   JSON stringify   method accepts a JavaScript object and returns its JSON equivalent     var jsonString   JSON stringify jsObject

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Recommended is to use JSON parse   There is an alternative you can do     var myObject   eval       myJSONtext           Json in javascript  Why is using the JavaScript eval function a bad idea

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You need to JSON parse   the string   x000D   x000D  var str      hello   world     try     var obj   JSON parse str      this is how you parse a string into JSON    document body innerHTML    obj hello    catch  ex      console error ex     x000D   x000D   x000D

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How about this    var parsed   new Function  return     stringifiedJSON        This is a safer alternative for eval    x000D   x000D  var stringifiedJSON      hello   world     x000D  var parsed   new Function  return     stringifiedJSON     x000D  alert parsed hello   x000D   x000D   x000D

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Check this out  http   jsfiddle net LD55x   Code     var myobj       myobj name  javascriptisawesome   myobj age 25  myobj mobile 123456789  debugger  var str   JSON stringify myobj   alert str   var obj   JSON parse str   alert obj

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save   click function          debugger     var xx           var dd      firstname        lastname        address             var otable1       table1   dataTable   fnGetData         for  var i   0  i  lt  otable1 length  i              dd firstname   otable1 i  0           dd lastname   otable1 i  1           dd address   otable1 i  2           xx push dd           var dd      firstname        lastname        address                   JSON stringify alert xx          ajax            url      Home save           type   POST           data  JSON stringify   u  xx             contentType   application json            dataType   json           success  function  event                alert event                   table2   dataTable   fnDraw                location reload

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JSON parse is the opposite of JSON stringify

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how about this partial solution  I wanna store  using a Config node  a global bigobj  with data   methods  as an alternative to importing an external library   used in many function nodes on my flow  Strange but it works  The global variable  bigobj     some  more   dx  quot here quot        array of objects with  array of objects  The  Config  node requires JSON          quot get dx quot    quot function  d p     return this some d  more p  dx    quot      test function    i e  a JSON version of a function      all in one line      USE  Inside a function node  var bigO   global get  quot bigobj quot     function callJSONMethod obj  fname  a  b  c  d          see  https   stackoverflow com questions 49125059 how-to-pass-parameters-to-an-eval-based-function-injavascript var wrap   s   gt   quot   return  quot    obj fname     quot     quot    return the block having function expression var func   new Function wrap obj fname     return func call  null   call  obj  a  b  c  d     invoke the function using arguments    msg payload  callJSONMethod bigO   quot get dx quot   2  2    return msg   returns  quot here quot   unbelieve  i e I must add the function callJSONMethod   to any function block using bigobj      maybe acceptable  Best regards

User · Answer

JSON stringify and JSON parse are almost oposites  and  usually  this kind of thing will work   var obj        var json   JSON stringify obj     var obj2   JSON parse json     so that obj and obj2 are  the same    However there are some limitations to be aware of  Often these issues dont matter as you re dealing with simple objects  But I ll illustrate some of them here  using this helper function   function jsonrepack  obj     return JSON parse JSON stringify obj          You ll only get ownProperties of the object and lose prototypes   var MyClass   function     this foo  foo      MyClass prototype     bar  bar     var o   new MyClass    var oo   jsonrepack o   console log oo bar      undefined console log  oo instanceof MyClass       false  You ll lose identity   var o       var oo   jsonrepack o   console log  o     oo       false  Functions dont survive   jsonrepack    f function             Returns     Date objects end up as strings   jsonrepack new Date 1990 2 1       Returns  1990-02-01T16 00 00 000Z   Undefined values dont survive   var v     x undefined   console log  x  in v                   true console log  x  in jsonrepack v        false  Objects that provide a toJSON function may not behave correctly   x     f  foo   toJSON function    return  EGAD       jsonrepack x     Returns  EGAD     I m sure there are issues with other built-in-types too   All this was tested using node js so you may get slightly different behaviour depending on your environment too    When it does matter it can sometimes be overcome using the additional parameters of JSON parse and JSON stringify  For example   function MyClass  v       this date   new Date v year 1 1      this name    an object       MyClass prototype dance   function    console log  I m dancing       var o   new MyClass  year 2010    var s   JSON stringify o       Smart unpack function var o2   JSON parse  s  function k v     if k               var rv   new MyClass 1990 0 0        rv date   v date       rv name   v name       return rv     else if k    date         return new Date  Date parse v         else   return v          console log o                    date   lt Mon Feb 01 2010     gt   name   an object    console log o constructor       Function  MyClass  o dance                        I m dancing  console log o2                   date   lt Mon Feb 01 2010     gt   name   an object    console log o2 constructor      Function  MyClass          o2 dance                       I m dancing

[javascript] Reverse of JSON.stringify?

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