envfill

Interactive CLI to populate .env files from templates.

Install

npx envfill

Quick Start

Create .env.template:

# Database password
DB_PASSWORD=<secret:32>

# Your user ID
USER_ID=`id -u`

# App environment
NODE_ENV=<dev|staging|*prod>

# Public URL
PUBLIC_URL=<required,url>

Run npx envfill and get prompted for each value.

Template Syntax

Value	Behavior
PORT=3000	Default value
KEY=	Prompt (no default)
UID=`id -u`	Shell command as default
SECRET=<secret:32>	Auto-generate
ENV=<a|b|*c>	Options (* = default)
URL=<required>	Must provide
URL=<url>	URL validation
EMAIL=<email>	Email validation
PORT=<port>	Port validation
DEBUG=<boolean>	Yes/no toggle

Combine with comma: <required,url>

CLI Options

envfill -i config.template -o .env.local
envfill --defaults    # Use all defaults
envfill --overwrite   # Re-prompt all (ignore existing)
envfill --dry-run     # Preview output

Use in package.json

{
  "scripts": {
    "setup": "envfill",
    "setup:ci": "envfill --defaults"
  }
}

Then run npm run setup to interactively fill your .env.

License

MIT