'React charset not display correctly UTF-8

I use to Materiul-UI kit for react, After build, UTF-8 character set does not correctly display.

Instead of UTF-8 character set exc. 'Ş,Ü,ö,Ç,ç', Shows that question symbol. '?'

I try this on my single page html.

<meta charset="utf-8">

but doesn't work. Giriş --> Giri?

reactjs material-ui

Solution 1:^[1]

Well, if you have added the meta tag with charset to html <head> there might be a problem with:

Your code editor or IDE is not using UTF-8 charset (check your settings).
You're using a custom font in your app that hasn't these characters. (maybe you're only add font-family: "yourFont"; but you should use a alternative font family when you have a character that doesn't exists in your custom font family font-family: "yourFont", sans-serif;)
If you're writing your code using accented or special chars like you mentioned above in different encoding setting f.e. ISO-8859-15 in your code editor/IDE and using webpack, you can try a plugin from here React + Webpack character enconding issues.

This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.

Solution	Source
Solution 1