As you can see in the picture I have created my own frontend and backend using ReactJS and Express/Node+MongoDB. Here in the leftmost side you can see the approach I try to write the function to authenticate the user via the submit button. In the middle section I have shown the backend request to "localhost:5000/api/users" but for some reason it fails. In the rightmost corner I have tried to enter username and password but it gives me a CORS policy error. Can anyone suggest to me what would be the error over here ? In the same backend but different route "localhost:5000/api/sushibars" is perfectly working as you can see in the next picture.

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