Uncaught SyntaxError Unexpected token

Question

I am running an AJAX call in my MooTools script  this works fine in Firefox but in Chrome I am getting a Uncaught SyntaxError  Unexpected token   error  I cannot determine why  Commenting out code to determine where the bad code is yields nothing  I am thinking it may be a problem with the JSON being returned  Checking in the console I see the JSON returned is this     votes  47  totalvotes  90    I don t see any problems with it  why would this error occur   vote each function e     e set  send         onRequest   function          spinner show               onComplete   function          spinner hide               onSuccess   function resp         var j   JSON decode resp         if   j  return false        var restaurant   e getParent   restaurant          restaurant getElements   votes   0  set  html   j votes     vote s                restaurants  restaurant   pop   set  html    Total Votes      j totalvotes         buildRestaurantGraphs                   e addEvent  submit   function e       e stop        this send

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In my case i ran into the same error  while running spring mvc application due to  wrong mapping in my mvc controller   RequestMapping name   private updatestatus     i changed the above mapping to     RequestMapping   private updatestatus     or    RequestMapping value   private updatestatus  method   RequestMethod GET

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When you request your JSON file  server returns JavaScript Content-Type header  text javascript  instead of JSON  application json    According to MooTools docs      Responses with javascript content-type will be evaluated automatically    In result MooTools tries to evaluate your JSON as JavaScript  and when you try to evaluate such JSON     votes  47  totalvotes  90    as JavaScript  parser treats   and   as a block scope instead of object notation  It is the same as evaluating following  code     votes  47  totalvotes  90   As you can see    is totally unexpected there   The solution is to set correct Content-Type header for the JSON file  If you save it with  json extension  your server should do it by itself

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I got a   SyntaxError  Unexpected token I  when I used jQuery getJSON   to try to de-serialize a floating point value of Infinity  encoded as INF  which is illegal in JSON

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Seeing red errors      Uncaught SyntaxError  Unexpected token  lt    in your Chrome developer s console tab is an indication of HTML in the response body    What you re actually seeing is your browser s reaction to the unexpected top line  lt  DOCTYPE html gt  from the server

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For me the light bulb went on when I viewed the source to the page inside the Chrome browser  I had an extra bracket in an if statement  You ll immediately see the red circle with a cross in it on the failing line  It s a rather unhelpful error message  because the the Uncaught Syntax Error  Unexpected token makes no reference to a line number when it first appears in the console of Chrome

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My mistake was forgetting single double quotation around url in javascript   so wrong code was   window location   https   google com    and correct code   window location    https   google com

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This has just happened to me  and the reason was none of the reasons above  I was using the jQuery command getJSON and adding callback   to use JSONP  as I needed to go cross-domain   and returning the JSON code   foo   bar   and getting the error   This is because I should have included the callback data  something like jQuery17209314005577471107 1335958194322   foo   bar     Here is the PHP code I used to achieve this  which degrades if JSON  without a callback  is used    ret  foo      bar   finish     function finish         header  content-type application json        if    GET  callback              print   GET  callback                  print json encode  GLOBALS  ret         if    GET  callback              print                exit       Hopefully that will help someone in the future

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It sounds like your response is being evaluated somehow  This gives the same error in Chrome   var resp      votes  47  totalvotes  90    eval resp     This is due to the braces         being interpreted by javascript as a code block and not an object literal as one might expect   I would look at the JSON decode   function and see if there is an eval in there   Similar issue here  Eval     Unexpected token   error

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Uncaught SyntaxError  Unexpected token     Chrome gaved me the error for this sample code    lt div class  file-square  onclick  window location      dir zzz  gt       lt div class  square-icon  gt  lt  div gt       lt div class  square-text  gt zzz lt  div gt   lt  div gt    and solved it fixing the onclick to be like      onclick  window location     dir zzz         But the error has nothing to do with the problem

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This error might also mean a missing colon or   in your code

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I thought I d add my issue and resolution to the list   I was getting  Uncaught SyntaxError  Unexpected token  lt  and the error was pointing to this line in my ajax success statement   var total     parseJSON response     I later found that in addition to the json results  there was HTML being sent with the response because I had an error in my PHP   When you get an error in PHP you can set it to warn you with huge orange tables and those tables were what was throwing off the JSON   I found that out by just doing a console log response  in order to see what was actually being sent   If it s an issue with the JSON data  just try to see if you can do a console log or some other statement that will allow you to see what is sent and what is received

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This happened to because I have a rule setup in my express server to route any 404 back to    plus whatever the original request was  Allowing the angular router js to handle the request  If there s no js route to handle that path  a request to    whatever is made to the server  which is just a request for    the entire webpage    So for example if I wanted to make a request for  correct somejsfile js but I miss typed it to  wrong somejsfile js the request is made to the server  That location file does not exist  so the server responds with a 302 location     wrong somejsfile js  The browser happily follows the redirect and the entire webpage is returned  The browser parses the page as js and you get     Uncaught SyntaxError  Unexpected token  lt    So to help find the offending path request look for 302 requests   Hope that helps someone

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Uncaught SyntaxError  Unexpected token  error appearance when your data return wrong json format  in some case  you don t know you got wrong json format  please check it with alert    function    onSuccess   function resp        alert resp         your message received should be    firstName   John    lastName   Doe   and then you can use code below  onSuccess   function resp        var j   JSON decode resp      but in my case i m using  JSON parse resp        with out error  Uncaught SyntaxError  Unexpected token  but if you get wrong json format ex             firstName   John    lastName   Doe     or    Undefined variable  errCapt in      on line lt b gt 65 lt  b gt  lt br  gt   firstName   John    lastName   Doe     so that you got wrong json format  please fix it before you JSON decode or JSON parse

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If nothing makes sense  this error can also be caused by PHP Error that is embedded inside html javascript  such as the one below   lt br   gt   lt b gt Deprecated lt  b gt    mysql connect    The mysql extension is deprecated and will be removed in the future  use mysqli or PDO instead in  lt b gt C  Projects rwp demo en super ge php lt  b gt  on line  lt b gt 54 lt  b gt  lt br   gt  var zNodes     id 1  pId 0  name  ACE   url    ace1 php   target   self   open true    Not the  lt br   gt  etc in the code that are inserted into html by PHP is causing the error  To fix this kind of error  suppress warning   used this code in the start  error reporting E ERROR   E PARSE     To view  right click on page   view source  and then examine complete html to spot this error

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In my case it was a mistaken url  not existing   so maybe your  send  in second line should be other

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For those experiencing this in AngularJs 1 4 6 or similar  my problem was with angular not finding my template because the file at the templateUrl  path  I provided couldn t be found  I just had to provide a reachable path and the problem went away

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This happened to me today as well  I was using EF and returning an Entity in response to an AJAX call  The virtual properties on my entity was causing a cyclical dependency error that was not being detected on the server  By adding the  ScriptIgnore  attribute on the virtual properties  the problem was fixed   Instead of using the ScriptIgnore attribute  it would probably be better to just return a DTO

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I have just solved the problem  There was something causing problems with a standard Request call  so this is the code I used instead   vote each function element                     element addEvent  submit   function e       e stop        new Request JSON         url   e target action         onRequest   function            spinner show                   onComplete   function            spinner hide                   onSuccess   function resp           var j   resp          if   j  return false          var restaurant   element getParent   restaurant            restaurant getElements   votes   0  set  html   j votes     vote s                  restaurants  restaurant   pop   set  html    Total Votes      j totalvotes           buildRestaurantGraphs                   send this               If anyone knows why the standard Request object was giving me problems I would love to know

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I had the same problem and it turned out that the Json returned from the server wasn t valid Json-P  If you don t use the call as a crossdomain call use regular Json

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I did Wrong in this      var  fs   require  fs        var fs writeFileSync file  configJSON      Already I intialized the fs variable But again i put var in the second line This one also gives that kind of error

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Just an FYI for people who might have the same problem -- I just had to make my server send back the JSON as application json and the default jQuery handler worked fine

[javascript] Uncaught SyntaxError: Unexpected token :

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