How to convert javascript unicode notation code to utf-8?

Question

Is there a command line tool or online service that can convert javascript unicode notation code to utf-8?

E.g. I got this json code, but it is hard to edit in common text editor.

{"name":"leon zhang","city":"\u4e0a\u6d77"}

I want to convert it to:

{"name":"leon zhang","city":"上海"}

Answer 1

You use the below javascript function to convert unicode to utf-8

function encode_utf8( s ){
    return unescape( encodeURIComponent( s ) );
}( '\u4e0a\u6d77' )

You can also try it out in firebug console. It works.