Fix: EACCES permission denied when installing npm packages globally
How to fix 'Error: EACCES: permission denied, access /usr/local/lib/node_modules' when running npm install -g on macOS or Linux. Multiple solutions ranked by recommendation.
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Fix: Error Cannot find module in Node.js (MODULE_NOT_FOUND)
How to fix 'Error: Cannot find module' and 'MODULE_NOT_FOUND' in Node.js. Covers missing packages, wrong import paths, node_modules issues, TypeScript moduleResolution, ESM vs CJS, and monorepo hoisting.
Fix: git push rejected – non-fast-forward error
How to fix 'error: failed to push some refs' and '! [rejected] main -> main (non-fast-forward)' in Git. Covers pull, rebase, force push, and edge cases.
Fix: Access to fetch has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header
How to fix 'Access to fetch at ... from origin ... has been blocked by CORS policy: No Access-Control-Allow-Origin header is present on the requested resource' in JavaScript. Covers Express, Django, Flask, Spring Boot, ASP.NET, nginx, Apache, dev proxies, preflight requests, credentials, and edge cases.
Fix: fatal: refusing to merge unrelated histories
How to fix the Git error 'fatal: refusing to merge unrelated histories' when pulling, merging, or rebasing branches that don't share a common ancestor.
Fix: Docker Permission Denied While Trying to Connect to the Docker Daemon Socket
How to fix the 'permission denied while trying to connect to the Docker daemon socket at unix:///var/run/docker.sock' error on Linux, WSL2, macOS, and CI.