How to fix Unexpected token o in JSON at position 1 using JavaScript?

Question

This question is seems to be already answered but my scenario is different. I am getting Unexpected token o in JSON at position 1 everytime. Can anyone help me to fix this.Thanks

here is my code

function send()
{

    let detail = new FormData();
    detail.append("start",true);
    detail.append("user",'david');
   
postRequest("https://myjson-url/game.php?"
,detail, getData);

}

function getData(res)
{

    let data = JSON.parse(res);
    console.log(data);

}
//async function
  async function checkStatus(res) {
    if (!res.ok) {
      throw new Error(await res.text());
    }
    return res;
  }

//my post request

    function postRequest(url, info, func){
        fetch(url, {method: "POST", body: info})
        .then(checkStatus)
        .then(func)
        .catch(console.error);
    }

Put your console.log above your JSON.parse and make sure you are getting a valid JSON response. — Ryan Wilson
– Ryan Wilson, Commented Nov 12, 2020 at 20:59
@RyanWilson Thanks for your response. Yes I just did I am getting console message but the rest of the JSON.parse is not working.. — user3718511
– user3718511, Commented Nov 12, 2020 at 21:01
@user3718511 If it's returning valid JSON you wouldn't be getting an error. — Ryan Wilson
– Ryan Wilson, Commented Nov 12, 2020 at 21:03

Shell Code · Accepted Answer · 2020-11-12 21:02:15Z

14

It could be that in getData(res) the res is already a parsed JSON object so this line is not necessary :

let data = JSON.parse(res);

Try change it to

let data = res;

answered Nov 12, 2020 at 21:02

Shell Code

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6 Comments

user3718511 Over a year ago

Thanks for your answer. I just tried but its not working..I am only getting response message from Response {type: "cors", url: "myjson-url/game.php?", redirected: false, status: 200, ok: true, …}

Shell Code Over a year ago

@user3718511 what do you expect to be getting? Does the response or res variable have a res.body attribute?

Shell Code Over a year ago

Does the res.body attribute contain the data you want to get from the server?

user3718511 Over a year ago

yes it is. Thats why I am confused why its not working..

Shell Code Over a year ago

JSON.parse() only parses a string into a javascript object. But res is already a javascript object. So it gives an error when trying to parse it. Res is not a string.

|

user3718511 · Accepted Answer · 2022-05-23 19:51:53Z

2

add json() let data = res.json();

edited May 23, 2022 at 19:51

answered Nov 12, 2020 at 21:49

user3718511

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