dotenvx — mizchi/skills Agent Skill

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dotenvx Skill

dotenvx is an environment variable management tool that loads and encrypts .env files. Language- and framework-agnostic.

Installation

bash

# curl (recommended)
curl -sfS https://dotenvx.sh | sh

# brew
brew install dotenvx/brew/dotenvx

# npm
npm install @dotenvx/dotenvx --save

Basic Commands

bash

# Load environment variables and run a command
dotenvx run -- node index.js

# Specify a particular .env file
dotenvx run -f .env.production -- npm start

# Load multiple files (later ones take precedence)
dotenvx run -f .env -f .env.local -- npm start

# Get an environment variable
dotenvx get DATABASE_URL

# Display all environment variables
dotenvx get

Encryption

bash

# Encrypt .env (generates DOTENV_PUBLIC_KEY, DOTENV_PRIVATE_KEY)
dotenvx encrypt

# Encrypt a specific file
dotenvx encrypt -f .env.production

# Decrypt
dotenvx decrypt

# Run an encrypted file (requires DOTENV_PRIVATE_KEY)
dotenvx run -- node index.js

How Encryption Works

Running dotenvx encrypt generates a public/private key pair
DOTENV_PUBLIC_KEY: stored inside the .env file (for encryption)
DOTENV_PRIVATE_KEY: set in the local environment or CI (for decryption)
Per-environment: auto-detected via DOTENV_PRIVATE_KEY_PRODUCTION

Options

Option	Description
`-f, --env-file`	Specify the .env file
`--overload`	Overwrite with subsequent files
`--quiet`	Suppress output
`--verbose`	Verbose output
`--debug`	Show debug information

Managing Multiple Environments

.env                 # Shared settings
.env.local           # Local overrides (gitignore)
.env.production      # Production
.env.development     # Development

bash

# Run in production
dotenvx run -f .env.production -- npm start

# Development + local overrides
dotenvx run -f .env.development -f .env.local -- npm run dev

Key Rotation

Procedure for when a private key is suspected of being leaked, or for periodic rotation. As of 2026/04 there is no dedicated dotenvx rotate command, so explicitly do decrypt → encrypt with a new key.

Order is critical: update the CI secret to the new key first, then merge the new ciphertext. If reversed, prod will fail trying to decrypt the new ciphertext with the old key.

bash

# 1. Working branch + stash old key
git switch -c chore/rotate-prod-dotenv-key
set +o history
OLD_PRIV="$DOTENV_PRIVATE_KEY_PRODUCTION"

# 2. Decrypt with the old key (back to plaintext)
DOTENV_PRIVATE_KEY_PRODUCTION="$OLD_PRIV" dotenvx decrypt -f .env.production

# 3. Remove the existing PUBLIC_KEY, then re-encrypt (a new key pair is generated)
sed -i.bak '/^DOTENV_PUBLIC_KEY_PRODUCTION=/d' .env.production
dotenvx encrypt -f .env.production
NEW_PRIV=$(dotenvx get DOTENV_PRIVATE_KEY_PRODUCTION -f .env.keys)

# 4. Update CI secret to the new key (before the merge)
gh secret set DOTENV_PRIVATE_KEY_PRODUCTION --body "$NEW_PRIV" --env production

# 5. Commit + merge + deploy the new ciphertext
git add .env.production && git commit -m "chore: rotate production dotenv key"
git push && gh pr create --fill && gh pr merge --squash --auto

# 6. Cleanup
unset OLD_PRIV; set -o history
rm .env.production.bak

Additional steps on a leak:

Old ciphertext remaining in git history can still be decrypted with the past old key. Key rotation alone is insufficient
The encrypted values themselves (DB passwords, API keys, etc.) must also be reissued in parallel
If full removal from history is required, use git filter-repo, but be careful due to the large impact of force push

Avoiding downtime: a blue-green approach that temporarily keeps both DOTENV_PRIVATE_KEY_PRODUCTION and DOTENV_PRIVATE_KEY_PRODUCTION_NEW in parallel and removes the old one after a successful deploy is also viable.

GitHub Actions

Install via curl. See assets/gh_action_example.yaml for a complete example.

yaml

steps:
  - uses: actions/checkout@v4

  - name: Install dotenvx
    run: curl -sfS https://dotenvx.sh | sh

  - name: Run tests
    env:
      DOTENV_PRIVATE_KEY: ${{ secrets.DOTENV_PRIVATE_KEY }}
    run: dotenvx run -- npm test

References

https://github.com/dotenvx/dotenvx
https://dotenvx.com/docs