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I'm using Ethplorer API to retrieve token symbol for particular address. For this purpose I use Get token info:

/getTokenInfo/{address}

In most cases I receive readable symbol but for some tokens I get unreadable ones. So the following token address I get the following symbol:

"symbol":"\ud83c\udfcb\ufe0f"

How can I decode to readable string?

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Use this method to convert unicode format to string.

function unicodeToChar(text) {
   return text.replace(/\\u[\dA-F]{4}/gi, 
          function (match) {
               return String.fromCharCode(parseInt(match.replace(/\\u/g, ''), 16));
          });
}

for more details

https://stackoverflow.com/questions/17267329/converting-unicode-character-to-string-format/22021709

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