javascript - Convert UTF-8 data into the proper string format - Stack Overflow

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If I receive a UTF-8 string via a socket (or for that matter via any external source) I would like to get it as a properly parsed string object. The following code shows what I mean

var str='21\r\nJust a demo string \xC3\xA4\xC3\xA8-should not be anymore parsed';

// Find CRLF
var i=str.indexOf('\r\n');

// Parse size up until CRLF
var x=parseInt(str.slice(0, i));

// Read size bytes
var s=str.substr(i+2, x)

console.log(s);

This code should print

Just a demo string äè

but as the UTF-8 data is not properly parsed it only parses it up to the first Unicode character

Just a demo string ä

Would anyone have an idea how to convert this properly?

If I receive a UTF-8 string via a socket (or for that matter via any external source) I would like to get it as a properly parsed string object. The following code shows what I mean

var str='21\r\nJust a demo string \xC3\xA4\xC3\xA8-should not be anymore parsed';

// Find CRLF
var i=str.indexOf('\r\n');

// Parse size up until CRLF
var x=parseInt(str.slice(0, i));

// Read size bytes
var s=str.substr(i+2, x)

console.log(s);

This code should print

Just a demo string äè

but as the UTF-8 data is not properly parsed it only parses it up to the first Unicode character

Just a demo string ä

Would anyone have an idea how to convert this properly?

• javascript
• node.js
• unicode
• utf-8
• character-encoding

Share Improve this question Follow asked Jul 17, 2014 at 17:24 user3847784user3847784 2311 gold badge11 silver badge33 bronze badges 4

• You may want to use Punycode, here is a library too: github./bestiejs/punycode.js – howderek Commented Jul 17, 2014 at 17:29
• This might help: stackoverflow./questions/17057407/… – Diodeus - James MacFarlane Commented Jul 17, 2014 at 17:29
• @howderek Thanks, but how would a punycode library help in this case? – user3847784 Commented Jul 17, 2014 at 17:30
• nvm, I thought you were doing this over http, use this string instead: '21\r\nJust a demo string \xE4\xE8\xC3\xA8-should not be anymore parsed' you simply used the wrong escapes – howderek Commented Jul 17, 2014 at 17:36

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2 Answers 2

Sorted by: Reset to default 2

It seems you could use this decodeURIComponent(escape(str)):

var badstr='21\r\nJust a demo string \xC3\xA4\xC3\xA8-should not be anymore parsed';

var str=decodeURIComponent(escape(badstr));

// Find CRLF
var i=str.indexOf('\r\n');

// Parse size up until CRLF
var x=parseInt(str.slice(0, i));

// Read size bytes
var s=str.substr(i+2, x)

console.log(s);

BTW, this kind of issue occurs when you mix UTF-8 and other types of enconding. You should check that as well.

You should use utf8.js which is available on npm.

var utf8 = require('utf8');
var encoded = '21\r\nJust a demo string \xC3\xA4\xC3\xA8-foo bar baz';
var decoded = utf8.decode(encoded);
console.log(decoded);

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