Checklists for software errors, setup, and tool workflows.

1. Reproduce

2. Isolate

3. Apply

4. Verify

Latest checklists

You're trying to push a commit that includes a large file—maybe a dataset, a binary, or a gen...

If you see FATAL ERROR: Ineffective mark-compacts near heap limit Allocation failed - JavaS...

Firefox Secure Connection Failed: Date and Time Fix
If you see a 'Secure Connection Failed' error in Firefox that mentions date or time, it u...

Fix Nginx 502 Bad Gateway: Upstream Connection Refused
If you're seeing a 502 Bad Gateway error with "upstream connection refused" in your N...

Fix Node Sass Build Failure: Environment Variable Errors
When you run npm install or a build script and see an error like Node Sass doe...

How to Fix Cloudflare 522 Errors: Connection Timeout Guide
You're trying to load your site and see Error 522: Connection Timed Out. Thi...