This really depends on how your hosting provider works, as not all are equal. Its possible a "React app" can be hosted because React can build static files (HTML, CSS, JS) and basically all hosting providers can host static files.
I'd look into your hosting providers docs and see if/how they support nodejs. Its possible they don't provide a hosting/runtime for any back-end apps (Nodejs, PHP, Python, Java, whatever) and you may need to use another provider.
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This really depends on how your hosting provider works, as not all are equal. Its possible a "React app" can be hosted because React can build static files (HTML, CSS, JS) and basically all hosting providers can host static files.
I'd look into your hosting providers docs and see if/how they support nodejs. Its possible they don't provide a hosting/runtime for any back-end apps (Nodejs, PHP, Python, Java, whatever) and you may need to use another provider.