Q71. How do you handle environment variables in Next.js?
Next.js has built-in support for environment variables managed through `.env` files with strict client/server boundary isolation: ### File Priority Hierarchy: 1. `.env.de...
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Q72. What is scope in javascript?
Scope is the accessibility of variables, functions, and objects in some particular part of your code during runtime. In other words, scope determines the visibility of va...
Q73. What is the default port for a Next.js app?
By default, Next.js runs on **port 3000** for both the development server (`next dev`) and production server (`next start`). When you launch `npm run dev`, you can access...
Q74. What is a service worker?
A Service worker is basically a script (JavaScript file) that runs in the background, separate from a web page and provides features that don't need a web page or user in...
Q75. How to change default port for a Next.js app?
You can change the port used by Next.js using several straightforward approaches: ### 1. In `package.json` Scripts (Recommended): Pass the `-p` (or `--port`) flag in your...
Q76. How do you manipulate DOM using a service worker?
Service worker can't access the DOM directly. But it can communicate with the pages it controls by responding to messages sent via the `postMessage` interface, and those ...
Q77. What is Fast Refresh in Next.js?
**Fast Refresh** is Next.js's hot module replacement (HMR) experience that provides near-instantaneous visual feedback when you edit React components in development. ### ...
Q78. How do you reuse information across service worker restarts?
The problem with service worker is that it gets terminated when not in use, and restarted when it's next needed, so you cannot rely on global state within a service worke...
Q79. What is next.config.js?
A configuration file to customize Next.js settings. ```ts // @ts-check /** @type {import('next').NextConfig} */ const nextConfig = { /* config options here */ }; module.e...
Q80. What is IndexedDB?
IndexedDB is a low-level API for client-side storage of larger amounts of structured data, including files/blobs. This API uses indexes to enable high-performance searche...