localStorage Viewer & Inspector

Name: localStorage Viewer & Inspector
Author: EverydayTools

Inspect, search, edit, and export localStorage for the current site—JSON preview, quota meter, import/export in advanced mode. All client-side.

ScopeCurrent origin only — same as DevToolsPrivateNever uploaded — runs in your browserQuota~5 MB per origin (browser-dependent)

localStorage editor for this origin — never uploaded. Session storage

0 keys · 0 bytes

0 bytes / ~5.0 MB

Showing 0 of 0

No localStorage keys yet

This origin has no stored data—or you cleared it. Add a key below or insert sample data to explore the inspector.

localStorage.setItem("theme", "dark")

Add or edit key

Session storageTab-scoped storage JSON formatterFormat exported blobs Cookie parserHTTP cookies

By Muhammad Abdullah Rauf · Founder, EverydayTools.proUpdated 2026

What is a localStorage viewer?

A localStorage viewer lists key-value pairs stored for the current website origin in your browser, with search, JSON preview, edit, export, and delete—without sending data to a server.

localStorage is part of the Web Storage API. Each origin (protocol + host + port) gets an isolated key-value store that persists across page reloads and browser restarts until you clear it.

Developers use localStorage for user preferences, cached API responses, feature flags, and client-side tokens. Debugging often means finding the right key, checking whether a value is valid JSON, and confirming you are not over the ~5 MB per-origin quota.

This tool reads localStorage only for the page you open it on—the same data any script on that origin could already access. You can search keys and values, pretty-print JSON, edit entries in place, export a backup, import JSON, and bulk-delete stale keys. Nothing is uploaded; clipboard and file downloads stay on your device.

Inspect and edit this origin's localStorage in the browser—search, JSON view, export—never uploaded.

Quick answers

Concise answers for common searches — definitions, steps, and comparisons.

Is localStorage uploaded to EverydayTools?

No. The viewer only calls localStorage in your browser. Keys and values are never sent to our servers during normal use.

What is the localStorage size limit?

Most browsers allow about 5 MB per origin. Each key and value counts toward the limit as UTF-16 text (roughly 2 bytes per character).

localStorage vs sessionStorage?

localStorage persists until cleared. sessionStorage is cleared when the tab closes. Use Session Storage Viewer for tab-scoped data.

How browser localStorage works

Key-value strings scoped to origin; this tool uses the standard localStorage API in your browser with no server round-trip.

Formula

Origin = protocol + hostname + port
Quota ≈ 5 MB per origin (browser-dependent)

Assumptions

You open the tool on the origin whose storage you want to inspect
Keys and values are stored as strings (objects are usually JSON.stringify'd)

Limitations

Cannot read localStorage from other domains or subdomains
Very large values may slow JSON preview; extreme sizes skip auto-parse for stability

How to use localStorage Viewer & Inspector

Open on the target site
Load this tool on the same origin as the app you are debugging (e.g. your localhost dev server or staging URL).
Search keys or values
Use the search box to find auth tokens, settings JSON, or feature-flag keys. Switch sort order if you have many entries.
Inspect JSON values
Enable advanced mode for pretty-print JSON, expand large values, and copy or download individual keys.
Edit or clean up
Edit a value inline, add a test key, delete one entry, or clear all—changes apply immediately to this origin's localStorage.
Export or import backup
Export all keys as JSON for backup; import JSON to restore test data (confirm overwrite when prompted).

localStorage Viewer & Inspector examples

Find a stale auth token

Input

Search: "token" or "auth"

Output

Highlight matching keys · edit or delete the row

Quickly locate JWT or session blobs left over after logout bugs.

Check quota before adding cache

Input

12 keys · 4.2 MB used

Output

Usage bar warns near 80% of ~5 MB

Avoid QuotaExceededError when your app writes large JSON caches.

Who uses localStorage Viewer & Inspector?

Common real-world scenarios where this tool saves time.

Debug SPA settings and feature flags

Inspect JSON preference objects and toggle test values without redeploying.

Clear corrupted cache entries

Delete one bad key or export first, then clear all, when a PWA serves stale data.

QA test data setup

Import a JSON fixture into localStorage to reproduce a customer state on staging.

Workflow guides

Step-by-step chains that connect related tools for common tasks.

Debug cached API data in localStorage

Open the viewer on your app's origin and search for the cache key prefix your app uses.
Open JSON preview to validate structure and timestamps.
Format suspicious blobs with the JSON Formatter if you need to paste a value off-site.

Reference tables

localStorage vs sessionStorage vs cookies

Storage	Lifetime	Scope	Best for
localStorage	Until cleared	Per origin	Preferences, cached data, long-lived client state
sessionStorage	Until tab closes	Per origin, per tab	Wizard state, temporary form data
Cookies	Expires per Set-Cookie	Can be httpOnly / cross-subdomain	Auth sessions, server-readable tokens

Simple vs advanced mode in this tool

Mode	Includes	Use when
Simple	List, search, edit, add, refresh	Quick key lookup during everyday debugging
Advanced	JSON panel, bulk select, import/export, shortcuts	Large datasets or JSON-heavy apps

When to use localStorage Viewer & Inspector vs related tools

Related tool	Use this tool when	Use related tool when
Session Storage Viewer	You need data that survives browser restarts (preferences, caches).	You need tab-scoped state that clears when the session ends.
JSON Formatter	You are browsing keys inside localStorage on a live origin.	You have a raw JSON blob to format or validate outside the browser store.

Frequently Asked Questions

What can I see in localStorage?

All key-value pairs for the current origin. You can read, edit, add, delete individual keys, or clear everything. Values support JSON syntax highlighting when they parse as JSON.

Is localStorage data visible to other websites?

No. Storage is isolated per origin. This tool only accesses localStorage for the site you opened it on—other domains are never exposed.

Does this tool upload my localStorage data?

No. Inspection, edits, export, and import run entirely in your browser. Keys and values are never uploaded to EverydayTools servers.

What is the localStorage storage limit?

Typically about 5 MB per origin. Keys and values are UTF-16 strings, so storage size depends on character count. The tool shows current usage and warns when you are near the quota.

How is localStorage different from sessionStorage?

localStorage persists until explicitly cleared. sessionStorage clears when the tab or browser session ends. Both share the same ~5 MB limit and same-origin rules. Use our Session Storage Viewer for tab-scoped data.

Can I export and import localStorage as JSON?

Yes, in advanced mode. Export downloads a JSON object of all keys. Import merges or replaces entries after you confirm—useful for backups and test fixtures.

Privacy, accuracy, and trust

Privacy

localStorage is read and written only via your browser's APIs on the current origin. Keys and values are not uploaded or stored on EverydayTools servers during normal use.

Accuracy

Displays the same data DevTools Application tab would show for localStorage on this origin; quota display is approximate per browser.

Editing or clearing storage can break app behavior—use on dev/staging or after exporting a backup.

Part of Developer Tools

More free tools for the same workflow.