How to Decode Escaped Unicode Strings in JavaScript?

Decoding Encoded Unicode Strings in JavaScript

When working with strings containing encoded Unicode characters, it can be challenging to decode them properly. This article addresses the issue of decoding strings that have been encoded with escaped Unicode characters.

The specific problem described in the question involves a string that resembles httpu00253Au00252Fu00252Fexample.com. After attempting various methods such as unescape, decodeURI, and decodeURIComponent, the suggested solution is to use string replacement.

However, the initial condition is important to consider. The string in question is not directly typed but is instead a substring obtained from another piece of code, as seen in the following example:

var s = 'http\u00253A\u00252F\u00252Fexample.com';

This explains why unescape() does not yield the expected result.

The key to decoding such strings lies in utilizing JSON.parse. By encapsulating the encoded string within double quotes and parsing it as JSON, the browser automatically decodes the Unicode characters. The following example demonstrates this approach:

unescape(JSON.parse('"http\u00253A\u00252F\u00252Fexample.com"'));

// Output: 'http://example.com'

In this case, unescape() is used to remove any potentially remaining escape sequences. Note that unescape() is deprecated in non-browser environments and does not exist in TypeScript. For broader compatibility, it is recommended to use decodeURIComponent instead.

The above is the detailed content of How to Decode Escaped Unicode Strings in JavaScript?. For more information, please follow other related articles on the PHP Chinese website!