JQuery, JSON, iframe, and quotation marks do not work together

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Produce upload file in an iframe(a different kind of way). In response, generate a JSON object where one of the fields is a string with the html describing the error.
Question: How do I get this response from the server without breaking it?

When I use .text() from JQuery all tags are removed.
When I use .html() from JQuery it "corrects" the html and then it is not possible to do the deserialization of the JSON because the quotes are losing the escape character. we get Invalid JSON.
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4 Answers

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Try on the server before sending to the client the HTML to encode urlencode, JavaScript client om decode using decodeURI or unescape.
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As you generate and get json?
For that such data 
{"html":"!!!<\\/a>"}

using getJSON everything is displayed normally
\r
\r\r\r\r\r$(document).ready(function() {\r$.getJSON('j.php', '', function (data) {$('body').html(data.html);});\r}\r);\r\r\r\r\r\r
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to give in the iframe, not json, and a full html + javascript:
\rparent.callback_func({json: "data"});
\r
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innerHTML?
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