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Accessing LocalStorage in NextJS

Ibrahim Adeniyi on October 05, 2020

I recently migrated a Content Management System from Create React App to NextJS in order to score some SEO points. One of the challenges I faced w...
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Jaime López •

Nice trick, but I think it would make more sense to use useEffect method, did you try it?

useEffect(function() {
    console.log(window.localStorate);
},[]);
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simpleneeraj profile image
Simple Neeraj • 
useEffect(function() {
    console.log(window.localstorage);
},[]);
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Because some time we need to copy and paste code, and after code doesn't work after pasting so developers 😯😯😯😯😯.

Your Code have some mistakes check out this 👍

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Justus Okwuchukwu Ali •

You may find yourself in a situation where you need access to localStorage outside a react component. In that case useEffect cannot help.

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Magnus Bondesson •

window.localStorage (spelling)

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Simple Neeraj • • Edited

Trying to making a reusable function

This function for get data from localstorage
key is required

const getFromStorage = (key) => {
if(typeof window !== 'undefined'){
     window.localstorage.getItem(key)
}
}
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Set data to localstorage

const setToStorage = (key,value) => {
if(typeof window !== 'undefined'){
     return window.localstorage.setItem(key,value)
}
}
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Any new method to use window in nextjs

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Vu •

That's nice

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Ciro Santilli •

This leads to a warning of type "Expected server HTML to contain a matching" on Next 10 BTW: stackoverflow.com/questions/464436...

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ARiyou Jahan • • Edited

remember, never create a function for window type checking.
it always must be an explicit type checking or it will not work

Right way to do it:

if (typeof window !== "undefined") {
    // client-side operation such as local storage.
    localStorage.setItem(key, value)
}
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Wrong way:

const hasWindow = () => {
    return typeof window !== "undefined"
}

if (hasWindow()) {
    // client-side operation such as local storage.
    localStorage.setItem(key, value)
}

if (!hasWindow()) {
    // server-side code
}
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read more and reason for this problem: Next.js GitHub issues page

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Atom •

That's nice, but next time add a js tag to the code block to make it more readable.

Example:

if (typeof window !== "undefined") {

localStorage.setItem(key, value)

}
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Ibrahim Adeniyi •

Thank you

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Othman •

what if i want to access local storage inside redux reducer ?

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77pintu •

Thanks for the great post !!!!!!

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Julien Prugne •

Thanks mate!
Works the same with sessionStorage