Environment Variables Reference

Hub (`apps/web/.env.local` / Vercel Environment Variables)

Variable	Required	Example / Default	Description
`DATABASE_URL`	✅	`postgresql://user:pass@host/db?sslmode=require`	PostgreSQL Connection String (Neon, Supabase, RDS, etc)
`NEXTAUTH_SECRET`	✅	`openssl rand -base64 32`	JWT session encryption key (min 32 characters)
`NEXTAUTH_URL`	✅	`https://your-hub.vercel.app`	Canonical public URL of the Hub
`CRON_SECRET`	✅	`openssl rand -base64 32`	Bearer Auth token protecting `/api/internal/evaluate`
`NEXT_PUBLIC_APP_URL`	❌	`https://your-hub.vercel.app`	Public domain URL for status pages & CORS origins
`SMTP_HOST`	❌	`smtp.resend.com`	SMTP host for sending registration OTP emails
`SMTP_PORT`	❌	`587`	SMTP server port
`SMTP_USER`	❌	`resend`	SMTP authentication username
`SMTP_PASS`	❌	`re_...`	SMTP password or API key
`SMTP_FROM`	❌	`EZMON <noreply@domain.com>`	Sender email address for registration OTPs

Deprecated Note: WORKER_SECRET has been deprecated and replaced by CRON_SECRET starting in EZMON v0.1.14+.

Variable	Required	Default	Description
`EZMON_SERVER_URL`	✅	—	EZMON Hub URL (e.g. `https://your-hub.vercel.app`)
`EZMON_AGENT_TOKEN`	✅	—	Registration token or permanent agent token
`EZMON_AGENT_NAME`	❌	System `hostname`	Custom node display name shown in dashboard
`EZMON_HEARTBEAT_INTERVAL`	❌	`30`	Heartbeat push frequency (in seconds)