Local Storage Viewer – View & Edit localStorage

What is LocalStorage?

LocalStorage is a browser storage API that allows websites to store key-value data directly inside the user's browser. Unlike cookies, localStorage data persists even after the browser is closed.

Developers commonly use localStorage to store user preferences, authentication tokens, cached application data, and temporary settings.

Using a LocalStorage Viewer makes it easier to inspect and debug localStorage values stored by web applications. This browser storage viewer runs entirely in your browser with no data sent to any server.

How to View LocalStorage in Your Browser

You can view localStorage data using browser developer tools. Most modern browsers including Chrome, Firefox, and Edge allow developers to inspect localStorage directly.

1. Open browser Developer Tools (F12 or Right-click → Inspect)
2. Navigate to the Application tab (Chrome/Edge) or Storage tab (Firefox)
3. Select Local Storage in the sidebar
4. Choose your domain to see all keys and values

Alternatively, you can use this LocalStorage Viewer to view localStorage and edit localStorage online in your browser without opening DevTools. It works on any site you visit.

How to view localStorage in Chrome

In Google Chrome, press F12 or right-click the page and choose Inspect. Open the Application tab, expand Storage in the left sidebar, then click Local Storage and select your site's origin. You will see a table of keys and values for that domain only.

This LocalStorage Viewer shows the same origin-bound data in a simpler layout: search, edit, and export without digging through DevTools panels—useful when you want a focused browser storage view.

How to edit localStorage data

To edit localStorage data in DevTools, open the Application → Local Storage table, double-click a value, change the text, and press Enter. In this tool, click the pencil icon next to a row, update the value in the text area, and choose Save—the new string is written immediately with setItem.

You can also add keys with the Add new item section or merge many keys at once using Import JSON (Advanced mode). Always double-check values: incorrect JSON or tokens can break app flows until you fix or remove them.

Inspect browser storage online

When people search for inspect browser storage online, they usually want a clear list of keys and values for the current website. This page runs entirely in your browser: data never leaves your device, and you only see storage for the domain you opened the tool on.

Use it to audit what a site stores, debug SPA state, or copy values for support. For session-only data, use DevTools to inspect Session Storage; this viewer focuses on localStorage persistence across visits.

Debugging LocalStorage Data

When building modern web applications, developers frequently store tokens, configuration settings, and cached data inside localStorage.

Debugging localStorage can help identify issues such as incorrect values, expired tokens, or unexpected data stored by the application.

This LocalStorage Inspector allows developers to quickly view, edit, delete, and export storage data directly inside the browser. You can copy keys and values, download data as JSON or .env, and monitor storage usage—useful for debug localstorage workflows.

LocalStorage JavaScript Examples

Save data to localStorage

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

Read data from localStorage

const theme = localStorage.getItem("theme");

Remove a value

localStorage.removeItem("theme");

Clear all storage

localStorage.clear();

Get localStorage size (bytes)

Object.keys(localStorage).reduce((total, key) => {
  return total + localStorage.getItem(key).length;
}, 0);

Check if localStorage is supported

function isLocalStorageAvailable() {
  try {
    const test = "__test__";
    localStorage.setItem(test, test);
    localStorage.removeItem(test);
    return true;
  } catch {
    return false;
  }
}

Store objects in localStorage

const user = { name: "John", role: "admin" };
localStorage.setItem("user", JSON.stringify(user));

Retrieve object from localStorage

const user = JSON.parse(localStorage.getItem("user"));

Common LocalStorage Snippets

Click copy to use in your project.

localStorage.setItem("key","value")

localStorage.getItem("key")

localStorage.removeItem("key")

localStorage.clear()

LocalStorage Size Limits

Most modern browsers allow approximately 5 MB of localStorage per domain. The exact limit varies depending on the browser (some allow up to 10 MB).

If the storage quota is exceeded, the browser will throw a QuotaExceededError when attempting to store additional data.

Developers can monitor storage usage using tools like this LocalStorage Viewer, which displays total storage usage and individual item sizes so you can stay within the browser localStorage limit.

LocalStorage vs SessionStorage

Understanding the difference between localStorage and sessionStorage helps you choose the right API. Both store key-value pairs per origin, but they differ in persistence and scope.

Use localStorage when you need data to persist across sessions (e.g. theme, user settings). Use sessionStorage when data should live only for the current tab session (e.g. multi-step form state). This localstorage viewer inspects localStorage; use DevTools to inspect sessionStorage the same way.

Related Developer Tools

You may also find these developer tools useful when working with data and APIs:

• JSON Formatter — Format and validate JSON
• JSON Validator — Validate JSON syntax
• Regex Tester — Test regular expressions
• URL Encoder — Encode and decode URLs
• Timestamp Converter — Convert timestamps
• JWT Decoder — Decode and inspect JWT tokens
• Base64 Encoder / Decoder — Encode and decode Base64
• Domain Extractor — Extract domains from URLs and text

Why Use a LocalStorage Viewer?

A LocalStorage Viewer is essential for debugging web apps, inspecting stored data, and understanding what your application saves in the browser. Use it to troubleshoot login issues (e.g. stale or missing tokens), check cached settings, and verify that keys and values are written correctly.

This tool lets you inspect localStorage without opening DevTools, debug localStorage by editing values on the fly, and export data for backup or analysis. Whether you're building a SPA, debugging a third-party integration, or auditing what a site stores, a browser localStorage viewer saves time and keeps everything client-side and private.