How to escape special characters in building a JSON string?

Here is my string

{
    'user': {
        'name': 'abc',
        'fx': {
            'message': {
                'color': 'red'
            },
            'user': {
                'color': 'blue'
            }
        }
    },
    'timestamp': '2013-10-04T08: 10: 41+0100',
    'message': 'I'mABC..',
    'nanotime': '19993363098581330'
}    

Here the message contains single quotation mark, which is same as the quotation used in JSON. What I do is fill up a string from user inputs such as message. So, I need to escape those kind of special scenarios which breaks the code. But other than string replace, is there any way to make them escape but still allow HTML to process them back to the correct message?

I'm appalled by the presence of highly-upvoted misinformation on such a highly-viewed question about a basic topic.

JSON strings cannot be quoted with single quotes. The various versions of the spec (the original by Douglas Crockford, the ECMA version, and the IETF version) all state that strings must be quoted with double quotes. This is not a theoretical issue, nor a matter of opinion as the accepted answer currently suggests; any JSON parser in the real world will error out if you try to have it parse a single-quoted string.

Crockford's and ECMA's version even display the definition of a string using a pretty picture, which should make the point unambiguously clear:

The pretty picture also lists all of the legitimate escape sequences within a JSON string:

• \"
• \\
• \/
• \b
• \f
• \n
• \r
• \t
• \u followed by four-hex-digits

Note that, contrary to the nonsense in some other answers here, \' is never a valid escape sequence in a JSON string. It doesn't need to be, because JSON strings are always double-quoted.

Finally, you shouldn't normally have to think about escaping characters yourself when programatically generating JSON (though of course you will when manually editing, say, a JSON-based config file). Instead, form the data structure you want to encode using whatever native map, array, string, number, boolean, and null types your language has, and then encode it to JSON with a JSON-encoding function. Such a function is probably built into whatever language you're using, like JavaScript's JSON.stringify, PHP's json_encode, or Python's json.dumps. If you're using a language that doesn't have such functionality built in, you can probably find a JSON parsing and encoding library to use. If you simply use language or library functions to convert things to and from JSON, you'll never even need to know JSON's escaping rules. This is what the misguided question asker here ought to have done.

A JSON string must be double-quoted, according to the specs, so you don't need to escape '.
If you have to use special character in your JSON string, you can escape it using \ character.

See this list of special character used in JSON :

\b  Backspace (ascii code 08)
\f  Form feed (ascii code 0C)
\n  New line
\r  Carriage return
\t  Tab
\"  Double quote
\\  Backslash character

However, even if it is totally contrary to the spec, the author could use \'.

This is bad because :

• It IS contrary to the specs
• It is no-longer JSON valid string

But it works, as you want it or not.

For new readers, always use a double quotes for your json strings.

Everyone is talking about how to escape ' in a '-quoted string literal. There's a much bigger issue here: single-quoted string literals aren't valid JSON. JSON is based on JavaScript, but it's not the same thing. If you're writing an object literal inside JavaScript code, fine; if you actually need JSON, you need to use ".

With double-quoted strings, you won't need to escape the '. (And if you did want a literal " in the string, you'd use \".)

Most of these answers either does not answer the question or is unnecessarily long in the explanation.

OK so JSON only uses double quotation marks, we get that!

I was trying to use JQuery AJAX to post JSON data to server and then later return that same information. The best solution to the posted question I found was to use:

var d = {
    name: 'whatever',
    address: 'whatever',
    DOB: '01/01/2001'
}
$.ajax({
    type: "POST",
    url: 'some/url',
    dataType: 'json',
    data: JSON.stringify(d),
    ...
}

This will escape the characters for you.

This was also suggested by Mark Amery, Great answer BTW

Hope this helps someone.