DecodeURI()

The correct option to decode an encoded URI is the decodeURI() function. This function is used to decode a Uniform Resource Identifier (URI) that has been previously encoded using the encodeURI() function.

EncodeURI() and encodeURIComponent()

The encodeURI() function is used to encode a complete URI, while the encodeURIComponent() function is used to encode specific components within a URI. These functions are used to convert special characters and non-ASCII characters into a format that is safe for use within a URI.

Usage

When a URI is encoded using encodeURI() or encodeURIComponent(), certain characters are replaced with escape sequences. For example, spaces are replaced with " ", and special characters like "&", "=", and "?" are replaced with their respective escape sequences ("&", "=", and "?" respectively). This encoding is necessary to ensure that the URI remains valid and can be properly interpreted by web browsers and servers.

However, if you want to retrieve the original URI from its encoded form, you need to use the decodeURI() function. This function reverses the encoding process, converting the escape sequences back into their original characters.

Example

Let's say we have an encoded URI: "https://www.example.com/search?q=アプリ". This URI has been encoded using the encodeURIComponent() function, and the Japanese characters have been replaced with their escape sequences ("アプリ").

To decode this URI and retrieve the original characters, we can use the decodeURI() function. The result would be: "https://www.example.com/search?q=アプリ".

Conclusion

In summary, the decodeURI() function is used to decode an encoded URI and retrieve the original characters. It is the correct option to use when decoding a URI that has been previously encoded using the encodeURI() or encodeURIComponent() functions.