Uncaught SyntaxError Unexpected token On Chrome

Question

I know this question has been asked many times but I can t find similarity with my issue  I m getting this error only in Chrome  in every other browser everything is ok  I return data with JSON in several places but since my code works in other browsers I assume nothing is wrong with it  Chrome doesn t show me where is error  in my code  it shows me these errors     This is how I use JSON     post  getData php     id    id   function data           var obj   jQuery parseJSON data              some mysqli query  data    query- gt fetch assoc    echo json encode  data     So I don t see a problem here  can someone help me with this

User · Answer

Seems everyone has difference experiences from this and therfore solutions as well :) This is my "story".

My thing came from a validate.php file fetched with ajax. The output was meant to be :

$response['status'] = $status;
$response['message'] = $message;
$response['param'] = $param;

echo json_encode($response);

And the error that cause the "Unexpected token <" error was simply that in some cases $message hadn't been declared (but only $status and $param). So, added this in the beginning of the code.

$message = ''; // Default value, in case it doesn't get set later on.

So I guess, those "little things" may in this scenario big of quite importance. So be sure to really check your code and making it bulletproof.

User · Answer

Error with Uncaught SyntaxError  Unexpected token  lt  using  Mario answer but that was only part of my problem  Another problem is  javascript doesn t get any data from PHP file  That was solved using this code  inside PHP file  header  Content-Type  text javascript  charset utf-8    This answer is found on this link  where I opened another question to solve this issue  Can  39 t receive json data from PHP in Chrome and Opera

User · Answer

I got the same error   Uncaught SyntaxError  Unexpected token  lt     at these two lines when testing a sample application      lt script type    text javascript   src  raphael-min js  gt  lt  script gt   lt script type    text javascript   src  kuma-gauge jquery js  gt  lt  script gt    After a control  I realized that  local file locations are not correct and my local server app returns default page as the result  Client app can find the files but the founded files are default page  not the   js files  So I receive Uncaught SyntaxError  Unexpected token  lt    I changed to orginal location on the intenet andit solved    lt script type    text javascript   src    cdnjs cloudflare com ajax libs raphael 2 1 2 raphael-min js  gt  lt  script gt   lt script type    text javascript   src    www jqueryscript net demo Creating-Animated-Gauges-Using-jQuery-Raphael-js-kumaGauge js kuma-gauge jquery js  gt  lt  script gt

User · Answer

My solution to this is pretty unbelievable    lt script type  text javascript  src   js dataLayer js v 1  gt  lt  script gt    The filename in the src attribute needed to be lowercase    lt script type  text javascript  src   js datalayer js v 1  gt  lt  script gt    and that somewhat inexplicably fixed the problem    In both cases the reference was returning 404 for testing

User · Answer

To override the error that you might experience in Chrome  and probably in Safari   try to set the Ajax parameter as dataType   json   Then you shouldn t call parseJSON   on the obj because the response you ll get comes deserialized

User · Answer

I have commented my this code          description   val   lt  php echo   POST  description      gt     and I got that error

User · Answer

You can check your Network  console  and See the answer from the Server     The   lt   will be the first letter of your response  Something like   lt  undefined index XY in line Z

User · Answer

change it to     post             url    getData php              data      id  id               dataType    text               This way ajax will not try to parse the data into json or similar

User · Answer

It could be that the resource you re trying to request is under restricted access via your web app configuration  i e  user must be logged for the application to serve the file   Try adding this to your Web Config file  this is for  NET applications     lt location path  js resourcefile js  gt     lt system web gt       lt authorization gt         lt allow users       gt       lt  authorization gt     lt  system web gt   lt  location gt    You can place it anywhere before the closing configuration tag

User · Answer

I faced similar issue when I moved some of the js files into folders then deployed into production  after some struggle I found out that the js files were not actually got deployed to production  So    make sure that the file for which the error is shown does exist in  the server  the path given is correct   So  In the absence of js file  the server then server responds with as below    lt  doctype html gt       lt html gt           lt someTag   gt           lt AnotherTag   gt       lt  html gt    Thats why we get Uncaught SyntaxError  Unexpected token  lt

User · Answer

The only place it worked for me is when I place the scripts in public folder where my index html resides and then placing these  lt script type  text javascript  src  test test js  gt  lt  script gt  inside  lt body gt  tag

User · Answer

header  Location  route to main page      I ve encountered this problem while having a custom 404 error handling file  Instead of throwing some html content it was suppose to redirect to the main page url  It worked well   Then I used this as a skeleton for a next project  therefore not changing the  route to main page  actually on the new project  different URL  became a  route to external url  so any 404 errors within your code  missing css stylesheets  js libraries  would return the  Uncaught SyntaxError  Unexpected token  lt

User · Answer

If you are trying to perform Ajax file upload or something similar  you have to get rid of displaying further HTML after printing your ajax response text  Probably that gives this error message  If you are using PHP framework you have to follow framework syntax to end the application  If you are coding pure PHP  you can use  exit  after your ajax response text   Hope this will help save some ones  time on finding solution for this     happy coding

User · Answer

Had the same error  My problem was caused from shifting around my project directory  and failing to adjust the path to my static files on the server to reflect the new path  i e  was   src public but should have been   public

[json] Uncaught SyntaxError: Unexpected token < On Chrome

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