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Deployment for MERN stack apps (MongoDB database in the cloud (Choose a…

- - - - Set MongoDB connection string
        in app config, .env file, or env var
      - Set ENV vars and config files,
        e.g. for logs, etc
    - - Forever or PM2, etc?
  - - - Database connection string
      - JWT Private Key, Server API Key, etc
- - - - Accessing environment variables
        that were defined in the console or in .env files by
        using process.env.REACT_APP_MYENVVAR
      - Environment-specific .env files
        for storing environment variables with default values
        for each environment, e.g. .env, .env.development, .env.production, etc .
        (Uses the dotenv package that comes with create-react-app,
        but each line must start with REACT_APP_)
      - NB: Environment variables are read at build time
        and do not know about changes during run time
      - Setting environment variables
        manually on the Terminal/Console
    - - npm run build
        to create an optimised production build
        in the folder /build
        (smaller because it lacks the code that
        help us during development)
  - - - JWT Private Key, Server API Key
        (REACT_APP_API_KEY), etc
    - - Set REACT_APP_API_URL in .env.development
        to the URL of the API app on localhost
      - Set REACT_APP_API_URL in .env.production
        to the URL of the API app on Heroku
      - Set axios.defaults.baseURL to
        process.env.REACT_APP_API_URL
        in httpService
      - Ensure the Node app uses the cors package
      - Same for JWT Private Key, Server API Key, etc