SyntaxError Unexpected token o in JSON at position 1

Question

I parse few data using a type class in my controller I m getting data as follows           data             userList                                id  1               name   soni                               status  200      config             method   POST          transformRequest               null                 transformResponse               null                 url    home main module userlist          headers                rt   ajax             Tenant   Id null             Access-Handler   Authorization null             Accept   application json  text plain                         statusText   OK      I tried to store the data like this  var userData    data  var newData   JSON parse userData  data userList    How can I extract the user list to a new variable

User · Answer

Don t ever use JSON parse without wrapping it in try-catch block     payload  let userData   null   try          Parse a JSON     userData   JSON parse payload      catch  e           You can read e for more info        Let s assume the error is that we already have parsed the payload        So just return that     userData   payload        Now userData is the parsed result

User · Answer

We can also add checks like this  function parseData data        if   data  return         if  typeof data      object   return data      if  typeof data      string   return JSON parse data        return

User · Answer

var data   JSON parse userData   console log data

User · Answer

the first parameters of function JSON parse should be a String  and your data is a JavaScript object  so it will convert to a String  object object   you should use JSON stringify before pass the data  JSON parse JSON stringify userData

User · Answer

Unexpected  O  error is thrown when JSON data or String happens to get parsed   If it s string  it s already stringfied  Parsing ends up with Unexpected  O  error   I faced similar  although in different context   I solved the following error by removing JSON Producer        POST      Produces     MediaType APPLICATION JSON         public Response login  QueryParam  agentID   String agentID   Officer aOffcr           return Response status 200  entity  OK   build           The response contains  OK  string return   The annotation marked as  Produces     MediaType APPLICATION JSON     tries to parse the string to JSON format which results in Unexpected  O    Removing  Produces   MediaType APPLICATION JSON   works fine  Output   OK  Beware  Also  on client side  if you make ajax request and use JSON parse  OK    it throws Unexpected token  O   O is the first letter of the string  JSON parse object  compares with jQuery parseJSON object    JSON parse     name   Yergalem    city   Dover        --- Works Fine

User · Answer

You can simply check the typeof userData  amp  JSON parse   it only if it s string  var userData    data  var newData  if  typeof userData      object     newData   userData data userList     dont parse if its object else if  typeof userData      string     newData   JSON parse userData  data userList     parse if its string

User · Answer

Give a try catch like this  this will parse it if its stringified or else will take the default value let example     try      example    JSON parse data      catch e        example   data

User · Answer

The JSON you posted looks fine  however in your code  it is most likely not a JSON string anymore  but already a JavaScript object  This means  no more parsing is necessary   You can test this yourself  e g  in Chrome s console   new Object   toString        object Object    JSON parse new Object       Uncaught SyntaxError  Unexpected token o in JSON at position 1  JSON parse   object Object       Uncaught SyntaxError  Unexpected token o in JSON at position 1   JSON parse   converts the input into a string  The toString   method of JavaScript objects by default returns  object Object   resulting in the observed behavior   Try the following instead   var newData   userData data userList

User · Answer

Just above JSON parse  use   var newData   JSON stringify userData

User · Answer

Well  I meant that I need to parse object like this  var jsonObj     first name     fname    But  I don t actually  Because it s already an JSON

[javascript] SyntaxError: Unexpected token o in JSON at position 1

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