Checklists for software errors, setup, and tool workflows.

How to Fix Nginx 'Upstream Connection Refused' Error

When Nginx returns a 502 Bad Gateway with upstream connection refused in the error l...

Fix 'package.json Not Found' After Cloning a Repository

Symptom

You clone a repository from GitHub (or another remote), change into the directory...

Python Dependency Conflict Resolution Best Practices

If you've ever run pip install and seen a wall of red text about conflicting dep...

npm package.json Not Found After npm init

You run npm init, answer the prompts, and then try to install a package or run a scr...

How to Debug Docker Compose Environment Variables

When environment variables don't show up inside a container, the application often fails sile...

How to Check Node Version Compatibility with a Package

You're about to install or update a package, and you see warnings like "requires Node.js ...