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How do I set up environment variables securely on Heroku when deploying a full-stack React and Express application for my bootcamp capstone project?

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How do I set up environment variables securely on Heroku when deploying a full-stack React and Express application for my bootcamp capstone project?
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Heroku official docs config vars environment variables Node.js deployment React Express production secretsGoogle ↗
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Heroku official docs config vars environment variables Node.js deployment React Express production secrets Google ↗
  1. Heroku Dashboard · dashboard.heroku.com
  2. Configuration and Config Vars · devcenter.heroku.com
  3. Deploying Front-End Web Apps on Heroku · devcenter0.assets.heroku.com
  4. Node.js App Hosting in the Cloud · heroku.com
  5. Heroku Node.js Deployment · devcenter.heroku.com
  6. Heroku Local · devcenter.heroku.com
  7. dotenv documentation · npmjs.com

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