Uncaught SyntaxError Unexpected token with JSON parse

Question

what causes this error on the third line    x000D   x000D  var products      x000D     name    Pizza   x000D     price    10   x000D     quantity    7  x000D       x000D     name    Cerveja   x000D     price    12   x000D     quantity    5  x000D       x000D     name    Hamburguer   x000D     price    10   x000D     quantity    2  x000D       x000D     name    Fraldas   x000D     price    6   x000D     quantity    2  x000D      x000D  console log products   x000D  var b   JSON parse products     unexpected token o x000D   x000D   x000D    Open console to view error

User · Answer

Check this code  It gives you the clear solution of JSON parse error  It commonly happen by the newlines and the space between json key start and json key end data val   data val replace    n s  1    quot  g   quot   quot  quot                     replace    quot   n s  1   g   quot   quot  quot                     replace    n  g   quot   n quot

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Why you need JSON parse  It s already in array of object format   Better use JSON stringify as below   var b   JSON stringify products    This may help you

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The mistake I was doing was passing null  unknowingly  into JSON parse     So it threw Unexpected token n in JSON at position 0

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Oh man  solutions in all above answers provided so far didn t work for me   I had a similar problem just now   I managed to solve it with wrapping with the quote   See the screenshot  Whoo     Original    x000D   x000D  var products      x000D     name    Pizza   x000D     price    10   x000D     quantity    7  x000D       x000D     name    Cerveja   x000D     price    12   x000D     quantity    5  x000D       x000D     name    Hamburguer   x000D     price    10   x000D     quantity    2  x000D       x000D     name    Fraldas   x000D     price    6   x000D     quantity    2  x000D      x000D  console log products   x000D  var b   JSON parse products     unexpected token o x000D   x000D   x000D

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Hopefully this helps someone else   My issue was that I had commented HTML in a PHP callback function via AJAX that was parsing the comments and return invalid JSON   Once I removed the commented HTML  all was good and the JSON was parsed with no issues

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JSON parse is waiting for a String in parameter  You need to stringify your JSON object to solve the problem    products      name   Pizza   price   10   quantity   7      name   Cerveja   price   12   quantity   5      name   Hamburguer   price   10   quantity   2      name   Fraldas   price   6   quantity   2     console log products   var b   JSON parse JSON stringify products       solves the problem

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products      name   Pizza   price   10   quantity   7      name   Cerveja   price   12   quantity   5      name   Hamburguer   price   10   quantity   2      name   Fraldas   price   6   quantity   2       change to   products       name   Pizza   price   10   quantity   7      name   Cerveja   price   12   quantity   5      name   Hamburguer   price   10   quantity   2      name   Fraldas   price   6   quantity   2

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Use eval  It takes JavaScript expression code as string and evaluates executes it   eval inputString

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If there are leading or trailing spaces  it ll be invalid  Trailing Leading spaces can be removed as  mystring   mystring replace    s   s   g         Source  http   www toptip ca 2010 02 javascript-trim-leading-or-trailing html

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It seems you want to stringify the object  So do this     JSON stringify products     The reason for the error is that JSON parse   expects a String value and products is an Array   Note  I think it attempts json parse   object Array    which complains it didn t expect token o after

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I found the same issue with JSON parse inputString    In my case the input string is coming from my server page  return of a page method    I printed the typeof inputString  - it was string  still the error occurs   I also tried JSON stringify inputString   but it did not help   Later I found this to be an issue with the new line operator   n   inside a field value   I did a replace  with some other character  put the new line back after parse  and everything is working fine

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Now apparently  r   b   t   f  etc aren t the only problematic chars that can give you this error   Note that some browsers may have additional requirements for the input of JSON parse   Run this test code on your browser   var arr       for var x 0  x  lt  0xffff    x       try          JSON parse String fromCharCode 0x22  x  0x22         catch e           arr push x           console log arr     Testing on Chrome  I see that it doesn t allow JSON parse String fromCharCode 0x22  x  0x22    where x is 34  92  or from 0 to 31    Chars 34 and 92 are the   and   characters respectively  and they are usually expected and properly escaped  It s chars 0 to 31 that would give you problems   To help with debugging  before you do JSON parse input   first verify that the input doesn t contain problematic characters   function VerifyInput input       for var x 0  x lt input length    x           let c   input charCodeAt x           if c  gt   0  amp  amp  c  lt   31               throw  problematic character found at position     x

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The error you are getting i e   unexpected token o  is because json is expected but object is obtained while parsing  That  o  is the first letter of word  object

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Let s say you know it s valid JSON but your are still getting this      In that case it s likely that there are hidden special characters in the string from whatever source your getting them  When you paste into a validator  they are lost - but in the string they are still there  Those chars  while invisible  will break JSON parse    If s is your raw JSON  then clean it up with      preserve newlines  etc - use valid JSON s   s replace    n g     n                     replace      g                         replace      g                         replace     amp  g      amp                    replace    r g     r                   replace    t g     t                   replace    b g     b                   replace    f g     f       remove non-printable and other non-valid JSON chars s   s replace    u0000- u0019   g       var o   JSON parse s

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When you are using POST or PUT method  make sure to stringify the body part   I have documented an example here https   gist github com manju16832003 4a92a2be693a8fda7ca84b58b8fa7154

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products is an object    creating from an object literal   JSON parse   is used to convert a string containing JSON notation into a Javascript object   Your code turns the object into a string  by calling  toString    in order to try to parse it as JSON text  The default  toString   returns   object Object    which is not valid JSON  hence the error

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products is an array which can be used directly   var i  j   for i 0 i lt products length i      for j in products i       console log  property name      j  value    products i  j

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In my case there is following character problems in my JSON string   r  t  r n  n    quot   I have replaced them with another characters or symbols  and then revert back again from coding

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You should validate your JSON string here   A valid JSON string must have double quotes around the keys   JSON parse   u1  1000  u2  1100            will be ok   If there are no quotes  it will cause an error   JSON parse  u1 1000 u2 1100          error Uncaught SyntaxError  Unexpected token u in JSON at position 2   Using single quotes will also cause an error   JSON parse   u1  1000  u2  1100          error Uncaught SyntaxError  Unexpected token   in JSON at position 1

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It can happen for a lot of reasons  but probably for an invalid char  so you can use JSON stringify obj   that will turn your object into a JSON but remember that it is a JQUERY expression

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name    Pizza        price    10        quantity    7                name    Cerveja        price    12        quantity    5                name    Hamburguer        price    10        quantity    2                name    Fraldas        price    6        quantity    2            Here is your perfect Json that you can parse

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One other gotcha that can result in  SyntaxError  Unexpected token  exception when calling JSON parse   is using any of the following in the string values    New-line characters  Tabs  yes  tabs that you can produce with the Tab key   Any stand-alone slash    but for some reason not    at least not on Chrome      For a full list see the String section here    For instance the following will get you this exception          msg               message    It cannot contain a new-line            description    Some discription with a     tabbed space is also bad            value    It cannot have 3 4 un-escaped            So it should be changed to          msg               message    It cannot ncontain a new-line            description    Some discription with a t ttabbed space            value    It cannot have 3  4 un-escaped            Which  I should say  makes it quite unreadable in JSON-only format with larger amount of text

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The only mistake you are doing is  you are parsing already parsed object so it s throwing error  use this and you will be good to go    x000D   x000D  var products      x000D     name    Pizza   x000D     price    10   x000D     quantity    7  x000D       x000D     name    Cerveja   x000D     price    12   x000D     quantity    5  x000D       x000D     name    Hamburguer   x000D     price    10   x000D     quantity    2  x000D       x000D     name    Fraldas   x000D     price    6   x000D     quantity    2  x000D      x000D  console log products 0  name     name of item at 0th index x000D   x000D   x000D    if you want to print entire json then use JSON stringify

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Here s a function I made based on previous replies  it works on my machine but YMMV                                 description Converts a string response to an array of objects                  param  string  string - The string you want to convert                  returns  array  - an array of objects                             function stringToJson input                  var result                        replace leading and trailing     if present               input   input replace                          input   input replace                             change the delimiter to                input   input replace      g                             preserve newlines  etc - use valid JSON                 https   stackoverflow com questions 14432165 uncaught-syntaxerror-unexpected-token-with-json-parse             input   input replace    n g     n                  replace      g                      replace      g                      replace     amp  g      amp                 replace    r g     r                replace    t g     t                replace    b g     b                replace    f g     f                   remove non-printable and other non-valid JSON chars             input   input replace    u0000- u0019   g                      input   input split                        input forEach function element                       console log JSON stringify element                     result push JSON parse element                     this                  return result

User · Answer

JSON parse   deals with strings  but your products are objects  You need to convert them into strings  Also  make sure that your json format is correct  and there can be no format errors  otherwise there will be exceptions  You can use some online sites to verify JSON Formatter

[javascript] Uncaught SyntaxError: Unexpected token with JSON.parse

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