So got this JSON string,

{
    "Text": "<?xml version=\"1.0\"</pi>",
    "Type": "Checkin"
}

I need to deserialize it back to an object.

var returnedFileContent = '{"Text": "<?xml version=\"1.0\"</pi>","Type": "Checkin"}';
var test10 = JSON.parse(returnedFileContent);
console.log(test10)

Error:

Unexpected number in JSON at position 25

I know JS doesn't like the \" and it will work if the JSON string is:

{
    "Text": "<?xml version=\\\\\\" 1.0\\\\\\ "</pi>",
    "Type": "Checkin"
}

The problem is how to convert the \" to \\\".

Note: I have no control of the input JSON String.