v0
database
Vercel Postgres Connection String Not Found
Your application cannot connect to Vercel Postgres because the connection string is missing, invalid, or not properly loaded from environment variables. Database operations fail immediately.
Vercel Postgres provides connection strings that must be correctly configured in your Next.js project to enable database access.
Error Messages You Might See
DATABASE_URL is undefined
Connection string is empty
Failed to connect to Vercel Postgres
[postgres] missing connection credentials
Common Causes
- DATABASE_URL environment variable not set in Vercel project settings
- Vercel Postgres database not created or deleted
- Connection string copied incorrectly with missing credentials
- .env.local not used in development, relying only on Vercel env vars
- Connection string in .env file without NEXT_PUBLIC_ prefix misunderstanding which vars are public
How to Fix It
Create Vercel Postgres database: In Vercel Dashboard, go to Storage > Postgres, click 'Create' to provision a database.
Copy connection string: After creation, copy the 'Connection string' and set as DATABASE_URL in Vercel project settings.
Local development: Create .env.local with the same DATABASE_URL for testing locally with production database.
Verify in code: Ensure your app reads DATABASE_URL: const connectionString = process.env.DATABASE_URL
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Get HelpFrequently Asked Questions
Where do I find my Vercel Postgres connection string?
In Vercel Dashboard, go to your project > Storage > Postgres. Click your database and copy the 'Connection string' value.
Should I use production connection string in dev?
For testing, yes. For local development only, create separate local PostgreSQL instance with different DATABASE_URL.
Can I use multiple databases with Vercel?
Yes, create multiple Postgres instances and reference them with different environment variables (DATABASE_URL_READ, etc).