The answer
It is often a corrupted cache. Run npm cache clean, delete node_modules and the lockfile, and run npm install again. This fixes most mysterious hangs.
Common npm Install Errors in React Projects and How to Fix Them
What should I do if npm install hangs?
More FAQs in Common npm Install Errors in React Projects and How to Fix Them
Read the conflict to see which packages expect different versions, then update the offending package. Avoid using the legacy resolver flag as a first solution; it masks the real version mismatch.
Node.js is not installed or not on your PATH. Install Node.js from the official site or use a version manager like nvm, then reopen your terminal so the PATH updates.
Avoid using sudo. Use a version manager like nvm so global installs do not need elevated permissions, and fix folder ownership for node_modules if it is wrong. sudo masks the real problem and can cause more issues.
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