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Always use env variables

src/data/roadmaps/vibe-coding/content/never-hardcode-or-credentials-use-env-variables-instead@aRnpJbSUg_rr9Z00RafYt.md

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Always use env variables

API keys, passwords, and tokens should never appear directly in your code. Store them in a .env file using environment variables, and make sure that file is listed in .gitignore so it never gets pushed to GitHub accidentally.