Checklists for software errors, setup, and tool workflows.

1. Reproduce

2. Isolate

3. Apply

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Latest checklists

You're editing a file in Visual Studio Code, press Ctrl+S, and see a red error: "Failed t...

When nginx logs show "upstream connection refused" while connecting to port 80, it means ...

When you open the integrated terminal in VS Code and run a command, you might see permissio...

Fix npm ENOWENT Package.json Not Found on Mac
If you see 'ENOENT: no such file or directory, open /path/to/package.json' when running n...

How to Fix Git Push Rejected (Non-Fast-Forward) Error
You run git push and get an error like ! [rejected] main -> main (non-fast-...

Fixing Nginx 502 Bad Gateway in Docker Networks
You have an Nginx container proxying requests to another container (like a PHP-FPM or Node app), ...