jQuery.parseJSON returning null

Question

I am getting JSON back from a web service. When I use jQuery.parseJSON, for some reason it is null. This is an example of the JSON (got by using JSON.stringify(msg))

{"0":{"i":"1x 8351-3 & 2 x 8352-3","D":"Notes","V":"1x 8351-3 & 2 x 8352-3"},"1":{"i":"PC3","D":"Unit","V":"PC3"},"2":{"i":"PC3","D":"Unit","De":"Unit","V":"PC3"}}
var data = jQuery.parseJSON(msg);

data is null? Am I missing something? Thanks

Cannot reproduce: jsfiddle.net/5VVqg. Make sure the actual JSON you receive is valid: jsonlint.org. — Felix Kling
– Felix Kling, Commented May 28, 2012 at 14:05
when i load you page i get [object Object] in alert, is that suppose to happen? — Beginner
– Beginner, Commented May 28, 2012 at 14:07
That's the default string representation of an object. It should demonstrate that the result is not null. It could also be that the JSON is already parsed. How you are you getting the data? — Felix Kling
– Felix Kling, Commented May 28, 2012 at 14:09
Probably one of these questions stackoverflow.com/search?q=jquery+parseJSON+returns+null will help you. — Felix Kling
– Felix Kling, Commented May 28, 2012 at 14:14

Shyju · Accepted Answer · 2012-05-28 14:07:19Z

7

If your JSON is like this (assuming you are fetching data from web sevice via getJSON)

 {"error":"Error KL005"}

Then you don't need to call the parseJSON. It is a well formed JSON object. You can simply parse thru it.

var response={"error":"Error KL005"};
alert(response.error);

Example : http://jsfiddle.net/6YHeB/2/

Use JsonLint to check whether your expressions are valid JSON.

answered May 28, 2012 at 14:07

Shyju

220k106 gold badges420 silver badges499 bronze badges

Sign up to request clarification or add additional context in comments.

7 Comments

Felix Kling Over a year ago

var response={"error":"Error KL005"}; is not JSON nor a well formed JSON object. It's simply a JavaScript object.

Shyju Over a year ago

@FelixKling : Showed in a variable to demonstrate how to access the properties (from my js fiddle example). Fixed it now

Felix Kling Over a year ago

It's still confusing. The crucial part is that if OP uses getJSON, then the JSON is already parsed. But that has nothing to do with the structure of the JSON. If the response is not valid JSON, jQuery would not be able to parse it anyway.

Shyju Over a year ago

@FelixKling: Yea. I mentioned that (assuming you are using getJSON to get data). OP provided the JSON result he has and it seems to be valid JSON. So we do not need to parse it again. That was my whole point as well.

Felix Kling Over a year ago

I think you are confusing object literals with JSON. JSON is a data exchange format and by itself is just text. It has to be converted into the data structures of the language you are using, this means into JavaScript objcts/arrays here. Valid JSON does not mean it does not have to be parsed, it means it is "parse-able". Methods such as $.getJSON or setting the dataType: 'json' option for $.ajax do this automatically for you.

|

Collectives™ on Stack Overflow

jQuery.parseJSON returning null

1 Answer 1

7 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

7 Comments

Your Answer

Sign up or log in

Post as a guest

Related