SQL Error2 Fixes Available

Fix: Prisma Client could not connect to database

PrismaClientInitializationError: Can't reach database server at `localhost`:`5432`

What does this error mean?

This error occurs when the Prisma Client cannot establish a TCP connection to your database server. It is typically caused by incorrect environment variables, a stopped database service, or restrictive firewall rules/Postgres configurations.

Common Causes

Incorrect DATABASE_URL in your .env file
Database server is not running or is behind a firewall
Exceeded max connections on your database provider (common with Supabase/Neon)
Mismatched SSL/TLS requirements between Prisma and the database

How to Fix It (2 Solutions)

Verify the Connection String

Ensure your DATABASE_URL follows the correct format: postgresql://user:password@host:port/db?schema=public

Use a Connection Pooler

If using a serverless provider like Supabase, suffix your connection string with ?pgbouncer=true or use the specialized transaction port.

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