SyntaxError JSON parse unexpected character at line 1 column 1 of the JSON data

Question

I ve spend over 6 hours to find an exception or a special character to find in my code but I couldn t  I checked every similar messages in here   I m sending the form with magnific popup  First I m using inline popup to open my form than I m sending all inputs to main js to validate    So  I just need a third-eye    I ve got  index html  register php  main js     Here s the code   FORM  JS AJAX  PHP-register php     Here goes the error messages   JSON Output   Chrome Console     Firefox console        What am i  missing

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In some cases data was not encoded into JSON format  so you need to encode it first e g   json encode  data     Later you will use json Parse in your JS  like  JSON parse data

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I have the exact same issue and I ve found something   I ve commented the line     dataType    json    after that it was successful but    when I did console log data  it returned the main  index html   That s why you have  Unexpected token  lt   error and it cannot parse

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Sending JSON data with NodeJS on AJAX call      ajax       url    listClientsNames       type   POST       dataType   json       data  JSON stringify  foo  bar       done function response       console log  response      response 0  nom         Be aware of removing white spaces   app post   listClientsNames   function req res            var querySQL    SELECT id  nom FROM clients              var data   new Array             var execQuery   connection query querySQL  function err  rows  fields                if  err                   for var i 0  i lt 25  i                         data push   nom  rows i  nom                                               res contentType  application json                    res json data                 else                    console log   SQL005  - Une erreur est survenue

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JSON parse   doesn t recognize That data as string  For example  objAskGrant  quot Yes quot  objPass  quot asdfasdf quot  objNameSurname  quot asdfasdf adfasdf quot  objEmail  quot asdfaf asdfaf com quot  objGsm 3241234123 objAdres  quot asdfasdf quot  objTerms  quot CheckIsValid quot   Which is like this  JSON parse  objAskGrant  quot Yes quot  objPass  quot asdfasdf quot  objNameSurname  quot asdfasdf adfasdf quot  objEmail  quot asdfaf asdfaf com quot  objGsm 3241234123 objAdres  quot asdfasdf quot  objTerms  quot CheckIsValid quot     That will output SyntaxError  missing  quot     quot  instead of  quot   quot  on line    So correctly wrap all data like this     quot objAskGrant quot   quot Yes quot   quot objPass quot   quot asdfasdf quot   quot objNameSurname quot   quot asdfasdf adfasdf quot   quot objEmail quot   quot asdfaf asdfaf com quot   quot objGsm quot  3241234123  quot objAdres quot   quot asdfasdf quot   quot objTerms quot   quot CheckIsValid quot    Which works perfectly well for me  And not like this   quot   quot objAskGrant quot   quot Yes quot   quot objPass quot   quot asdfasdf quot   quot objNameSurname quot   quot asdfasdf adfasdf quot   quot objEmail quot   quot asdfaf asdfaf com quot   quot objGsm quot  3241234123  quot objAdres quot   quot asdfasdf quot   quot objTerms quot   quot CheckIsValid quot   quot  Which give the present error you are experiencing

User · Answer

I have got same Error while fetch data from json filesee attached link   SyntaxError  JSON parse  unexpected character at line 1 column 1 of the JSON data    So  i check the path of the json file which isn t correct    const search   document getElementById  search    const matchList   document getElementById  match-list       search json data and filter const searchStates   async searchText   gt        const res   await fetch     state json        const states   await res json        console log states      search addEventListener  input        gt  searchStates search value      so that i changed the path of the file   const res   await fetch    state json       amp  it gives me array back as a result  so  check your path  amp  try changed it  It will work in my case  I hope that s works

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For the benefit of searchers looking to solve a similar problem  you can get a similar error if your input is an empty string   e g   var d       var json   JSON parse d     or if you are using AngularJS  var d       var json   angular fromJson d     In chrome it resulted in  Uncaught SyntaxError  Unexpected end of input   but Firebug showed it as  JSON parse  unexpected end of data at line 1 column 1 of the JSON data    Sure most people won t be caught out by this  but I hadn t protected the method and it resulted in this error

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Even if your JSON is ok it could be DB charset  UTF8  problem  If your DB s charset collation are UTF8 but PDO isn t set up properly  charset workaround missing  some                     etc  in your DB could break your JSON encoding  still encoded but causing parsing issues   Check your connection string  it should be similar to one of these    pdo   new PDO  mysql host hostname dbname DBname   charset utf8     username   password       PHP  gt   5 3 6   pdo   new PDO  mysql host hostname dbname DBname   username   password    array PDO  MYSQL ATTR INIT COMMAND   gt   SET NAMES utf8          older versions   P S  Outdated but still could be helpful for people who re stuck with  unexpected character

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When the result is success but you get the   lt   character  it means that some PHP error is returned   If you want to see all message  you could get the result as a success response getting by the following   success  function response        var out            for var i   0  i  lt  response length  i              out    response i               alert out

User · Answer

Remove   dataType   json    replacing it with    dataType   text

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May be its irrelevant answer but its working in my case   don t know what was wrong on my server   I just enable error log on Ubuntu 16 04 server     For PHP error reporting E ALL   ini set  display errors   1

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The fact the character is a  lt  make me think you have a PHP error  have you tried echoing all errors   Since I  don t have your database  I m going through your code trying to find errors  so far  I ve updated your JS file      register-form   submit function  event         var entrance     this  find  input name  IsValid     val        var password     this  find  input name  objPassword     val        var namesurname     this  find  input name  objNameSurname     val        var email     this  find  input name  objEmail     val        var gsm     this  find  input name  objGsm     val        var adres     this  find  input name  objAddress     val        var termsOk     this  find  input name  objAcceptTerms     val         var formURL     this  attr  action          if  request            request abort       cancel if any process on pending            var postData              objAskGrant   entrance           objPass   password           objNameSurname   namesurname           objEmail   email           objGsm   parseInt gsm            objAdres   adres           objTerms   termsOk               post formURL postData function data status           console log  Data      data     nStatus      status                event preventDefault          PHP Edit    if  isset   POST           fValid   clear   POST  objAskGrant          fTerms   clear   POST  objTerms          if   fValid             fPass   clear   POST  objPass              fNameSurname   clear   POST  objNameSurname              fMail   clear   POST  objEmail              fGsm   clear int   POST  objGsm               fAddress   clear   POST  objAdres              UserIpAddress    hidden            UserCityLocation    hidden            UserCountry    hidden             DateTime   new DateTime             result    date- gt format  d-m-Y-H i s             krr   explode  -    result            resultDateTime   implode      krr             data   array  error    gt   Y  kleme Sirasinda Hata Olustu              kayit    INSERT INTO tbl Records UserNameSurname  UserMail  UserGsm  UserAddress  DateAdded  UserIp  UserCityLocation  UserCountry  IsChecked  GivenPasscode  VALUES    fNameSurname     fMail     fGsm     fAddress     resultDateTime     UserIpAddress     UserCityLocation     UserCountry     fTerms     fPass              retval   mysql query   kayit   conn       Update with you connection details             if   retval                     data   array  success    gt   Register Completed    postData    gt    POST                               valid ends      echo json encode  data

User · Answer

Are you sure you are not using a wrong path in the url field  - I was facing the same error  and the problem was solved after I checked the path  found it wrong and replaced it with the right one   Make sure that the URL you are specifying is correct for the AJAX request and that the file exists

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Changing the data type to text helped dataType   text   I have check with JSONlint and my json format was proper  Still it was throwing error when I set dataType   json   JSON Data    eventinvite  1  groupcount  8  totalMessagesUnread  0  unreadmessages    378  0  379  0  380  0  385  0  390  0  393  0  413  0  418  0

User · Answer

Try using MYSQLI ASSOC instead MYSQL ASSOC    usually the problem is solved changing that  Good luck

[javascript] SyntaxError: JSON.parse: unexpected character at line 1 column 1 of the JSON data

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