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Showing content from https://webplatform.github.io/docs/javascript/encodeURIComponent below:

encodeURIComponent · WebPlatform Docs

encodeURIComponent Summary

Encodes a text string as a valid component of a Uniform Resource Identifier (URI).

Syntax

encodeURIComponent( encodedURIString )

Examples

The following code first encodes a URI component and then decodes it.

var uriEncode = encodeURIComponent ("www.Not a URL.com");
 var uriDecode = decodeURIComponent(uriEncode);

 document.write(uriEncode);
 document.write("<br/>");
 document.write(uriDecode);

Remarks

The required encodedURIString argument is a value representing an encoded URI component.

The encodeURIComponent function returns an encoded URI. If you pass the result to decodeURIComponent , the original string is returned. Because the encodeURIComponent function encodes all characters, be careful if the string represents a path such as /folder1/folder2/default.html. The slash characters will be encoded and will not be valid if sent as a request to a web server. Use the encodeURI function if the string contains more than a single URI component.