Environment Variables

Every generated project includes a .env.example file with all required and optional variables.

Setup

cp .env.example .env.local

Variable	Description
`DATABASE_URL`	PostgreSQL connection string
`BETTER_AUTH_SECRET`	Random secret for auth token signing
`BETTER_AUTH_URL`	Your app's base URL (e.g. `http://localhost:3000`)

Variable	Description
`STRIPE_SECRET_KEY`	Stripe secret key
`STRIPE_PUBLISHABLE_KEY`	Stripe publishable key
`STRIPE_PRICE_ID`	Default subscription price ID
`STRIPE_WEBHOOK_SECRET`	Webhook endpoint secret

Variable	Description
`RESEND_API_KEY`	Resend API key
`EMAIL_FROM`	Sender email address

Variable	Description
`GITHUB_CLIENT_ID`	GitHub OAuth app client ID
`GITHUB_CLIENT_SECRET`	GitHub OAuth app client secret

All env vars are validated through src/lib/env.ts using the t3-env pattern:

import { env } from '@/lib/env';

// Type-safe, validated at build time
const dbUrl = env.DATABASE_URL;

Never use process.env directly in application code.