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Some special characters appears in the build of my app and trigger a SyntaxError after the build.

Example of special characters: ���s�J����Ln�̧�e"X���;R�ɸ��

It's also difficult to describe since it appears randomly and the position of the error in the code is random too.

I can't figure out why I have this error...

here is an example of what I can see when I click on the error

Félix Becquart
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    Is it binary? If yes you should convert to text first. – Anh-Tuan Mai Jul 03 '20 at 07:49
  • Sorry but I don't understand your answer :/ What is binary? – Félix Becquart Jul 03 '20 at 07:55
  • Those look like [unicode replacement characters](https://en.wikipedia.org/wiki/Specials_(Unicode_block)#Replacement_character) which means that there appears to be an invalid unicode character at that point. This usually happens when you send the data in a non-unicode format and attempt to interpret that as unicode. Read [UTF-8 all the way through](https://stackoverflow.com/questions/279170/utf-8-all-the-way-through) for more ideas on what you can try to do – apokryfos Jul 03 '20 at 08:24

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