Default Values

# .env
# Default value syntax: use value if set, otherwise use default
DATABASE_HOST=${DB_HOST:-localhost}
DATABASE_PORT=${DB_PORT:-5432}

# Alternative syntax (no colon): use value if set, otherwise use default
API_URL=${API_BASE_URL-https://api.example.com}

// index.js
console.log('DATABASE_HOST', process.env.DATABASE_HOST)
console.log('DATABASE_PORT', process.env.DATABASE_PORT)
console.log('API_URL', process.env.API_URL)

$ dotenvx run --debug -- node index.js
⟐ injected env (3) from .env
DATABASE_HOST localhost
DATABASE_PORT 5432
API_URL https://api.example.com