React gives me red underline errors but there is no error

Question

Visual Code gives errors in lines but there are no errors in those lines.

Answer 1

Please rename your file to "todo.jsx".

Explanation:

VSCode and other IDEs choose your parser based on the file extension. For VSCode it looks like you are creating a "normal" JavaScript file. But JavaScript does not know tags, so you get an error message.

A small addition: if you ever work with TypeScript in React, the same applies: instead of the .ts extension you should choose the .tsx extension.