Fix · Pages, phones and Arabic

"window is not defined" or "localStorage is not defined"

What you may see

The page crashes on the server or at build time

Most likely cause

Server code has no browser, so browser-only names do not exist while the page is drawn on the server.

Check first (about two minutes)

Find the file and line in the stack.

The fix prompt

What you type here never leaves your browser. The search runs on this page, and nothing is sent to a server or to an AI.

The exact error or what you see

What you did before it happened

Kept only in this browser, on this device. Keys and passwords are removed before anything is saved.

Prompt language

You are a senior front-end engineer who knows HTML, CSS, React, phones and Arabic right-to-left pages, and explains things 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
"window is not defined" or "localStorage is not defined"

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
Server code has no browser, so browser-only names do not exist while the page is drawn on the server.

DO THESE STEPS, IN THIS ORDER
1. Move the browser-only code into an effect (after loading), or into a client-only component, or guard it with a check that the name exists.
2. If a package needs the browser, load it only on the client.
Stop and tell me if what you see does not match a step. Do not skip ahead.

CHECK THAT IT WORKED
- The build passes and the feature still works in the browser.
Tell me exactly what I should see on the screen when it works.

DO NOT CHANGE
- Do not switch the whole page to client-only for one line.
- 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

Move the browser-only code into an effect (after loading), or into a client-only component, or guard it with a check that the name exists.
If a package needs the browser, load it only on the client.

Do not do this

Do not define fake window objects on the server.
Do not switch the whole page to client-only for one line.

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