Parsing a JSON object with escaped double quote attributes in javascript

Question

After reading a number of questions on parsing an object in javascript I'm still having issues with parsing the following query response:

{"messagesProfile": "[{\"message\": \"This is a test message\", \"sender\": \"[email protected]\", \"receiver
\": \"[email protected]\"}, {\"message\": \"This is a second test message\", \"sender\": \"[email protected]
\", \"receiver\": \"[email protected]\"}, {\"message\": \"This is a third test message\", \"sender\": \"test
@test.com\", \"receiver\": \"[email protected]\"}]", "successProfileMessages": true}

The code that parses the above response is:

if(data.successProfileMessages === false) {
            alert("Failed to retrieve messages");
        } else {
            if(typeof data.messagesProfile != "undefined" && data.messagesProfile != null && data.messagesProfile.length > 0) {
                messages = messages + "<tr>";
                messages = messages + "<td>";
                messages = messages + "There are no messages yet!";
                messages = messages + "</td>";
                messages = messages + "<td>";
            } else {
                // Successfully retrieved messages
                for(var i in  data) {
                    messages = messages + "<tr>";
                    messages = messages + "<td>";
                    messages = messages + data.messagesProfile.sender[i];
                    messages = messages + "</td>";
                    messages = messages + "<td>";
                    messages = messages + data.messagesProfile.message[i];
                    messages = messages + "</td>";
                    messages = messages + "</tr>";
                }
            }
        }

How is it possible to unescape the escaped double quotes and iterate through the JSON object's array fields?

"[{\"message\": \"This is a test message\", \"sender\": \"[email protected]\", \"receiver
\": \"[email protected]\"}, {\"message\": \"This is a second test message\", \"sender\": \"[email protected]
\", \"receiver\": \"[email protected]\"}, {\"message\": \"This is a third test message\", \"sender\": \"test
@test.com\", \"receiver\": \"[email protected]\"}]"

define 'having issues'? I assume you're parsing first with JSON.parse() before iterating over the data? — shennan
– shennan, Commented Oct 15, 2015 at 16:16
Yes the response is parsed with JSON.parse() but still the first branch in the if is taken. — Sebi
– Sebi, Commented Oct 15, 2015 at 16:18
That code assumes your JSON is already parsed. I think your question has nothing to do with JSON in the first place—you probably just want to iterate through a JavaScript data structure. — Álvaro González
– Álvaro González, Commented Oct 15, 2015 at 16:22

score 2 · Accepted Answer · 2015-10-16 15:42:25Z

2

the messageProfile property of data is a string so you need to parse it

you can do this in the else clause

var arrayResult = JSON.parse(data.messagesProfile);
for (var i = 0, len = arrayResult.length; i < len; i++) {
  var item = arrayResult[i];
  // do your stuff
}

For iterating over an array i discourage the use of for (var i in arrayResult) cause it will not give you the desired result. It will iterate through all the properties of the object (including the length property!!!!!)

edited Oct 16, 2015 at 15:42

answered Oct 15, 2015 at 16:14

user757095

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1 Comment

Sebi Over a year ago

That did it. I've messed up the if.

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