Database & ORM · Developer Error Resolution Lab

Fix Prisma P1001: 'Can't reach database server at host:port'

Troubleshoot network connectivity, SSL certificates, wrong port mappings, and environment variable issues with Prisma ORM.

Fix Guide:

Triggered Error Message:

PrismaClientInitializationError: Can't reach database server at `localhost`:`5432` (P1001)

Customize Solution for Your Environment

Database Host

Database Port

Database Name

# Test TCP port connection:
nc -zv db 5432

# If using Docker Compose, ensure both services share the same network:
# services:
#   web:
#     environment:
#       - DATABASE_URL=postgresql://user:pass@db:5432/production_db?schema=public
#     depends_on:
#       db:
#         condition: service_healthy

Root Cause & Mechanism Analysis

Why does this error occur?

Database container is not running, incorrect hostname (using `localhost` instead of Docker container name or `host.docker.internal`), or missing SSL flags (`sslmode=require`).