java - URL decoding in Javascript - Stack Overflow

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I want to decode a string that has been encoded using the java.URLEncoder.encode() method.

I tried using the unescape() function in javascript, but a problem occurs for blank spaces because java.URLEncoder.encode() converts a blank space to '+' but unescape() won't convert '+' to a blank space.

I want to decode a string that has been encoded using the java.URLEncoder.encode() method.

I tried using the unescape() function in javascript, but a problem occurs for blank spaces because java.URLEncoder.encode() converts a blank space to '+' but unescape() won't convert '+' to a blank space.

• java
• javascript

Share Improve this question Follow edited Sep 24, 2013 at 14:34 hopper 13.4k77 gold badges5151 silver badges5353 bronze badges asked Nov 15, 2008 at 9:53 user25778user25778 6,07144 gold badges2323 silver badges1212 bronze badges

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4 Answers 4

Sorted by: Reset to default 1

Try decodeURI("") or decodeURIComponent("") !-)

Using JavaScript's escape/unescape function is almost always the wrong thing, it is inpatible with URL-encoding or any other standard encoding on the web. Non-ASCII characters are treated unexpectedly as well as spaces, and older browsers don't necessarily have the same behaviour.

As mentioned by roenving, the method you want is decodeURIComponent(). This is a newer addition which you won't find on IE 5.0, so if you need to support that browser (let's hope not, nowadays!) you'd need to implement the function yourself. And for non-ASCII characters that means you need to implement a UTF-8 encoder. Code is available if you need it.

decodeURI[Component] doesn't handle + as space either (at least on FF3, where I tested).

Simple workaround:

alert(decodeURIComponent('http://foo./bar+gah.php?r=%22a+b%22&d=o%e2%8c%98o'.replace(/\+/g, '%20'))) 

Indeed, unescape chokes on this URL: it knows only UTF-16 chars like %u2318 which are not standard (see Percent-encoding).

Try

var decoded = decodeURIComponent(encoded.replace(/\+/g," "));

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