Print JSON parsed object

Question

I ve got a javascript object which has been JSON parsed using JSON parse I now want to print the object so I can debug it  something is going wrong with the function   When I do the following     for  property in obj        output    property          obj property          console log output     I get multiple  object Object  s listed  I m wondering how would I print this in order to view the contents

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You know what JSON stands for   JavaScript Object Notation   It makes a pretty good format for objects     JSON stringify obj  will give you back a string representation of the object

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try console dir   instead of console log    console dir obj     MDN says console dir   is supported by    FF8  IE9  Opera Chrome Safari

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to Print JSON parsed object just type  console log  JSON stringify data  null             and you will get output very clear

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Nice and simple   console log  object   O   obj

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The following code will display complete json data in alert box  var data     employees          firstName   John   lastName   Doe           firstName   Anna   lastName   Smith           firstName   Peter   lastName   Jones         json   JSON parse data   window alert JSON stringify json

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I don t know how it was never made officially  but I ve added my own json method to console object for easier printing stringified logs      Observing Objects  non-primitives  in javascript is a bit like quantum mechanics  what you  measure  might not be the real state  which already have changed     x000D   x000D  console json   console json    function argument   x000D      for var arg 0  arg  lt  arguments length    arg  x000D          console log   JSON stringify arguments arg   null  4     x000D    x000D   x000D     use example x000D  console json     1  a   null   a 1     a  1 2        x000D   x000D   x000D    Many times it is needed to view a stringified version of an Object because printing it as-is  raw Object  will print a  live  version of the object which gets mutated as the program progresses  and will not mirror the state of the object at the logged point-of-time  for example   var foo    a 1  b  1 2 3       lets peek under the hood console log foo       program keeps doing things which affect the observed object foo a   2 foo b   null

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If you want to debug why not use console debug  window console debug jsonObject

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Most debugger consoles support displaying objects directly  Just use  console log obj     Depending on your debugger this most likely will display the object in the console as a collapsed tree  You can open the tree and inspect the object

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Use string formats   console log   s  O    My Object   obj     Chrome has Format Specifiers with the following     s Formats the value as a string    d or  i Formats the value as an integer    f Formats the value as a floating point value   o Formats the value as an expandable DOM element  as in the Elements panel     O Formats the value as an expandable JavaScript object    c Formats the output string according to CSS styles you provide    Firefox also has String Substitions which have similar options     o Outputs a hyperlink to a JavaScript object  Clicking the link opens an inspector   d or  i Outputs an integer  Formatting is not yet supported   s Outputs a string   f Outputs a floating-point value  Formatting is not yet supported    Safari has printf style formatters    d or  i Integer   0 N f Floating-point value with N digits of precision  o Object  s String

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Just use  console info  CONSOLE LOG      console log response   console info  CONSOLE DIR      console dir response     and you will get this in chrome console     CONSOLE LOG    facebookSDK JS html 56 Object  name   Diego Matos   id   10155988777540434   facebookSDK JS html 57 CONSOLE DIR    facebookSDK JS html 58 Objectid   10155988777540434 name   Diego Matos   proto    Object

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If you want a pretty  multiline JSON with indentation then you can use JSON stringify with its 3rd argument      JSON stringify value   replacer   space      For example   var obj    a 1 b 2 c  d 3  e 4     JSON stringify obj  null             or  JSON stringify obj  null  4     will give you following result           a   1       b   2       c              d   3           e   4            In a browser console log obj  does even better job  but in a shell console  node js  it doesn t

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If you re working in js on a server  just a little more gymnastics goes a long way    Here s my ppos  pretty-print-on-server    ppos    object  space   2    gt  JSON stringify object  null  space  split   n   forEach s   gt  console log s      which does a bang-up job of creating something I can actually read when I m writing server code

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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

[javascript] Print JSON parsed object?

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