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Preflight is an infrastructure smoke-testing tool integrated into the Dotset CLI. While existing tools (like Zod or Envalid) check your types, Preflight checks your connections. It runs “Active Probes” against your environment variables to verify that your databases, caches, and APIs are actually reachable and authenticated correctly.

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The Problem

Deployment failures often occur because:
  • DATABASE_URL has a typo in the hostname.
  • The production database is behind a firewall that hasn’t been opened for your runner.
  • AWS credentials have expired.
  • A required environment variable is simply missing.

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The Solution

Preflight runs a suite of “Active Probes” pre-deployment. If a connection fails, Preflight exits with an error, preventing a broken build from reaching production. 
# Validates presence AND tests connectivity
dotset preflight check

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Supported Probes

We support the most common infrastructure dependencies out of the box:

Databases

PostgreSQL and MongoDB (authentication + connectivity).

Caches

Redis (connectivity + PING).

Cloud & APIs

AWS (STS) and HTTP/HTTPS endpoints.

Network

Generic TCP port checks.

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Getting Started

Ready to add safety to your deployments? Follow the Quickstart.