Using Vue.js to showcase Unicode, hexadecimal emojis, and octal literals in HTML

Received this response from the webserver:

"\ud83d\ude48\ud83d\ude02\ud83d\ude30\ud83d\ude09\ud83d\udc4f\ud83c\udffd\ud83d\udc4c\ud83c\udffd\ud83d\udd1d\u2714\ufe0f\ud83d\ude42 \344\366\374\337\u015b\u0161"

After decoding, it should look like this:

πŸ™ˆπŸ˜‚πŸ˜°πŸ˜‰πŸ‘πŸ½πŸ‘ŒπŸ½πŸ”βœ”οΈπŸ™‚ Γ€ΓΆΓΌΓŸΕ›Ε‘

The characters Àâüß are encoded as octal literals \344\366\374\337

To display the plain text message correctly without encoding, I used:

{{ JSON.parse('"' + messageContent.message  + '"') }}

Although this method worked for escaped Unicode values, a problem arose when encountering octal literals. ES6 does not support octal literals and throws an error. To address this, I used regex to identify octal literals and then parsed them using:

String.fromCharCode(parseInt(parseInt(val.replace('\\', ''), 8), 10))
. The process was tedious especially during parsing Unicode characters using JSON.parse(`"${val}"`).

I also noticed that directly displaying the server response with {{ response.message }} results in a normal string representation. However, assigning the same value to a new variable and displaying it with {{ message }}, shows the decoded emojis πŸ™ˆπŸ˜‚πŸ˜°πŸ˜‰πŸ‘πŸ½πŸ‘ŒπŸ½πŸ”βœ”οΈπŸ™‚.

Additionally, my algorithm for parsing text is not foolproof; sometimes it fails especially when dealing with skin color changes in emojis, resulting in incorrect parsing of Unicode messages.

If necessary, backend modifications can be made. However, considering the mobile app integration, any changes should not disrupt their functionality.

Any assistance or guidance on optimizing this process would be greatly appreciated.

Answer β„–1

One method to try decoding the unicode escape sequences (\uXXXX) and octal escape sequences (\XXX) manually is by following these steps:

const response = '\\ud83d\\ude48\\ud83d\\ude02\\ud83d\\ude30\\ud83d\\ude09\\ud83d\\udc4f\\ud83c\\udffd\\ud83d\\udc4c\\ud83c\\udffd\\ud83d\\udd1d\\u2714\\ufe0f\\ud83d\\ude42 \\344\\366\\374\\337\\u015b\\u0161'
const decoded = response
  .replace(/\\u(....)/g, (match, p1) => String.fromCharCode(parseInt(p1, 16)))
  .replace(/\\(\d{3})/g, (match, p1) => String.fromCharCode(parseInt(p1,  8)))
console.log(decoded)

A situation you may encounter is when the server sends a string with the characters \ud83d\ude48 (and so on), which requires explicit decoding by converting the escape sequences into their corresponding unicode characters. Conversely, if the JavaScript code contains a string literal with the characters \ud83d\ude48, it will automatically decode to πŸ™ˆ.

Pay attention to the distinction between these two strings:

console.log('\ud83d\ude48')
console.log('\\ud83d\\ude48')

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