Configuration and Config Vars | Heroku Dev CenterAdditional Resources Home Elements Products Pricing Careers Help Status Events Podcasts Compliance Center Heroku Blog Heroku Blog Find out what's new with Heroku on our blog. Visit Blog Last updated October 01, 2025 A single app always runs in multiple environments, including at least on your development machine and in production on Heroku. An open-source app might be deployed to hundreds of diffe
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