I'm using react, react-router-dom and express in my project. When I send a request by clicking on a link everything works well but if I send a request via browser it doesn't work. However, for some requests in a browser like http://localhost:8000/ or http://localhost:8000/admin works well but for some requests like http://localhost:8000/admin/users or http://localhost:8000/admin/account doesn't work well.

Error in browser says : bundle.js:1 Uncaught SyntaxError: Unexpected token < and it points on .