文字或文字中出现JSON.parse错误

Question

In PHP I use mysql_real_escape_string that transforms symbol ``' and " to \\' and \\"

After, I extract data from MySQL and use it in JavaScript as JSON.

For example, the b' is transformed to b\\' , and in JavaScript I have these errors:

var a='{"a":"b\'"}';
var b=JSON.parse(a);
alert(b.a);

var a='{"a":"b\""}';
var b=JSON.parse(a);
alert(b.a);

/*
Exception: JSON.parse: expected ',' or '}' after property value in object at line 1 column 9 of the JSON data
*/

Answer 1

If you are looking to include the quote in the JSON String, add an addition \\ .

Example

 var a = '{"a":"b\\'"}'; var b = JSON.parse(a); alert(ba); var a = '{"a":"b\\\\""}'; var b = JSON.parse(a); alert(ba); 

Answer 2

Remove extra quote from this line var a='{"a":"b\\""}';

Modified Code:

var a='{"a":"b\"}';
var b=JSON.parse(a);
alert(b.a);

Answer 3

var a='{"a":"b\'"}';  //or you can use "{\"a\":\"b'\"}";
var b=JSON.parse(a);
alert(b.a);

This works because the value stored in variable a is {"a":"b'"}

var a='{"a":"b\\""}';    //or you can use "{\"a\":\"b\\\"\"}";
var b=JSON.parse(a);
alert(b.a);

For this case the value stored in variable a is {"a":"b\\""}

You can try to construct the string that the JSON should look like by constructing the object and stringify it like so:

var a = { "a" : "b'" };
console.log(JSON.stringify(a));

Answer 4

After you extract data from MySQL, use stripslashes() to strip the extra backslashes. And then encode the data as JSON.