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decodeURIComponent

The decodeURIComponent() function decodes a Uniform Resource Identifier (URI) component previously created by encodeURIComponent or by a similar routine.

Syntax

decodeURIComponent(encodedURI)

Parameters

encodedURI
An encoded component of a Uniform Resource Identifier.

Return value

A new string representing the decoded version of the given encoded Uniform Resource Identifier (URI) component.

Exceptions

Throws an URIError ("malformed URI sequence") exception when used wrongly.

Description

Replaces each escape sequence in the encoded URI component with the character that it represents.

Examples

Decoding a Cyrillic URL component

decodeURIComponent('JavaScript_%D1%88%D0%B5%D0%BB%D0%BB%D1%8B');
// "JavaScript_шеллы"

Catching errors

try { 
  var a = decodeURIComponent('%E0%A4%A'); 
} catch(e) { 
  console.error(e); 
}

// URIError: malformed URI sequence

Decoding query parameters from a URL

decodeURIComponent cannot be used directly to parse query parameters from a URL. It needs a bit of preparation.

function decodeQueryParam(p) {
  return decodeURIComponent(p.replace(/\+/g, ' '));
}

decodeQueryParam('search+query%20%28correct%29');
// 'search query (correct)'

Specifications

Browser compatibilityUpdate compatibility data on GitHub

Desktop
Chrome Edge Firefox Internet Explorer Opera Safari
decodeURIComponent 1 12 1 5.5 7 1.1
Mobile
Android webview Chrome for Android Firefox for Android Opera for Android Safari on iOS Samsung Internet
decodeURIComponent 1 18 4 10.1 1 1.0
Server
Node.js
decodeURIComponent 0.1.100

See also

© 2005–2018 Mozilla Developer Network and individual contributors.
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://wiki.developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/decodeURIComponent