SYMBOL INDEX (7 symbols across 3 files)

FILE: backend/index.js
  constant PORT (line 25) | const PORT = process.env.PORT || 3000;

FILE: backend/middlewares/checkId.js
  function checkId (line 3) | function checkId(req, res, next) {

FILE: frontend/src/redux/constants.js
  constant BASE_URL (line 1) | const BASE_URL = "";
  constant USERS_URL (line 2) | const USERS_URL = "/api/v1/users";
  constant GENRE_URL (line 3) | const GENRE_URL = "/api/v1/genre";
  constant MOVIE_URL (line 4) | const MOVIE_URL = "/api/v1/movies";
  constant UPLOAD_URL (line 5) | const UPLOAD_URL = "/api/v1/upload";