Your JSON is invalid

Question

94

Get value from json undefined what I have wrong?

rated 0 times [ 101] [ 7] / answers: 1 / hits: 54227 / 9 Years ago, thu, october 29, 2015, 12:00:00

I have this string:

[

 {id:001,

  name:Charlie},

  {id:002,

  name:Ellie},

]

Them, I save this string in a variable and I parse it:

function parseJSON(string){

   var mylovelyJSON = JSON.stringify(string); 

   alert(mylovelyJSON[id]); 

}

When I make my alert, I get and undefined, I also tried with mylovelyJSON.id, And I get the same.

Could not be a Json? I get this string from an php array.

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monetm

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answered 9 Years ago abagail · Accepted Answer

There are many things wrong here

Your JSON is invalid

You have an extra , just before the end of the array that you need to remove

You need to parse

JSON.stringify converts a JavaScript data structure into a string of JSON.

You need to go the other way and use JSON.parse.

Square-bracket notation takes strings

mylovelyJSON[id] takes the value of id (which is undeclared so, in this case, would throw a reference error) and gets the property with the name that is the same as that value.

You need either mylovelyJSON[id] or mylovelyJSON.id

You have an array

Your JSON consists of an array of objects, not a single object.

You need to get an object out of the array before you can access properties on it.

mylovelyJSON[0][id]

var json_text = '[{id:001,name:Charlie},{id:002,name:Ellie}]';



parseJSON(json_text);



function parseJSON(string){

   var result_of_parsing_json = JSON.parse(string);

   document.body.appendChild(

     document.createTextNode(result_of_parsing_json[0][id])

   );

}