Checklists for software errors, setup, and tool workflows.

1. Reproduce

2. Isolate

3. Apply

4. Verify

Latest checklists

If you're using a multi-root workspace in VS Code and finding that breakpoints in some folder...

When Nginx returns a 502 Bad Gateway or logs upstream connection refused

Python Requests Timeout: Default Value and How to Set It
When using the Python requests library, you might notice that some requests hang ind...

Fix Node.js package.json Engine Check Failures
When you run npm install and see an error like EBADENGINE or engi...

Fix Node.js Heap Out of Memory on Linux Server
If your Node.js application crashes on a Linux server with FATAL ERROR: Ineffective mark-co...

Fix Git 'index.lock file exists' Error
When you see the error fatal: Unable to create 'path/.git/index.lock': File exists....