Fix · Node, npm and build

EACCES: permission denied when installing

What you may see

npm says permission denied on a folder
Someone told me to use sudo

Most likely cause

npm tries to write in a folder owned by another user or protected by the system, often because an earlier command was run with sudo.

Check first (about two minutes)

Read which folder the error names: inside your project, or a system folder?

The fix prompt

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The exact error or what you see

What you did before it happened

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Prompt language

You are a patient senior engineer who knows Node.js, npm and build tools and explains them to people who are not developers. I am not a developer, so explain every step in plain words and tell me exactly which button, menu or command you mean. If you are not sure about something, say so; do not guess.

THE PROBLEM
EACCES: permission denied when installing

THE EXACT ERROR OR WHAT I SEE
[paste the exact error here]

WHAT I DID BEFORE IT HAPPENED
[write in a few words what you did before it happened]

MOST LIKELY CAUSE
npm tries to write in a folder owned by another user or protected by the system, often because an earlier command was run with sudo.

DO THESE STEPS, IN THIS ORDER
1. Show the folder in the error and who owns it (ls -ld <folder>).
2. If it is a global install, avoid it: use npx or a project-local install instead.
3. If a project folder is owned by root, explain how to fix the owner for that folder only, and ask me before running it.
Stop and tell me if what you see does not match a step. Do not skip ahead.

CHECK THAT IT WORKED
- npm install finishes in the project folder without sudo.
Tell me exactly what I should see on the screen when it works.

DO NOT CHANGE
- Do not run sudo npm.
- Anything I did not ask about: the design, the text, other pages, other settings or the data.
- Do not delete files, data or branches, do not reset or force-push, and do not rewrite history, unless you first show me exactly what would be lost and I say yes.
- Do not paste, print or ask me to paste a password or secret key into this chat. If one is needed, tell me which settings page of the right service to store it in.

WHEN YOU FINISH
Explain in simple words what you changed (file by file or setting by setting), why you changed it, and how I can undo it.

Paste it into Claude, ChatGPT, Gemini or Cursor, then follow what it says.

After you tried it, did it work?

Steps

Show the folder in the error and who owns it (ls -ld <folder>).
If it is a global install, avoid it: use npx or a project-local install instead.
If a project folder is owned by root, explain how to fix the owner for that folder only, and ask me before running it.

Do not do this

Do not change permissions of the whole system or home folder.
Do not run sudo npm.

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