39. What is web storage?

Why do you need web storage?

Web storage is needed to store data locally on the user's browser, which helps improve performance and user experience by reducing server requests and loading times. It allows data to persist across sessions and enables offline functionality. Web storage is primarily used for:

• Storing user preferences and settings
• Caching data for faster loading
• Maintaining session state (e.g., login status)
• Reducing server load by storing frequently accessed data locally

How do you check web storage browser support?

You can check for localStorage and sessionStorage support using the following code:

javascript
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if (typeof(Storage) !== "undefined") {
  console.log("Web Storage is supported");
} else {
  console.log("Web Storage is not supported");
}

Alternatively, you can test them individually like this:

javascript
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if (window.localStorage) {
  console.log("localStorage is supported");
}
if (window.sessionStorage) {
  console.log("sessionStorage is supported");
}

How do you check web workers browser support?

You can check if web workers are supported using this code:

javascript
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if (typeof(Worker) !== "undefined") {
  console.log("Web Workers are supported");
} else {
  console.log("Web Workers are not supported");
}