JSON parsing error Jquery

Question

I am using a web server that returns JSON but jquery fails to parse that json and shows following error

Uncaught SyntaxError: Unexpected token ' in JSON at position 1

The data returned by api seems to be fine. I copied the response in my js file and tried to parse it with $.parseJSON but I get the same error. Here is the code snippet containing returned json and a call to parseJSON

var jso = "['ADCP1_SNR_CH1','ADCP1_SNR_CH2','ADCP1_SNR_CH3','ADCP1_RADVEL_CH0']";
        var dt = $.parseJSON(jso);

My question is, what is wrong with the above json array? why do I bump into this error?

json.org You can run the JSON through a service like JSONlint.com too. Basically, string literals have to be within double quotes. — Heretic Monkey
– Heretic Monkey, Commented Aug 1, 2017 at 16:49
Also duplicate of SyntaxError: Unexpected token ' in JSON at position 1. 9 times out of 10, searching for the error message gets you what you want. Someone with your rep should know we expect people to do their research... — Heretic Monkey
– Heretic Monkey, Commented Aug 1, 2017 at 16:52

Nicolas Budig · Accepted Answer · 2017-08-01 16:53:01Z

2

The problem is that single quotes are not valid in JSON. Swap the single and double quotes, like so:

var jso = '["ADCP1_SNR_CH1","ADCP1_SNR_CH2","ADCP1_SNR_CH3","ADCP1_RADVEL_CH0"]';
    var dt = $.parseJSON(jso);

Alternatively, you can escape the quotes like this:

var jso = "[\"ADCP1_SNR_CH1\",\"ADCP1_SNR_CH2\",\"ADCP1_SNR_CH3\",\"ADCP1_RADVEL_CH0\"]";
    var dt = $.parseJSON(jso);

answered Aug 1, 2017 at 16:53

Nicolas Budig

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Sumner Evans · Accepted Answer · 2017-08-01 16:49:53Z

2

JSON does not support single quotes ('). It must use double quotes:

var jso = '["ADCP1_SNR_CH1","ADCP1_SNR_CH2","ADCP1_SNR_CH3","ADCP1_RADVEL_CH0"]';
var dt = $.parseJSON(jso);
console.log(dt);

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>

answered Aug 1, 2017 at 16:49

Sumner Evans

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