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JAVASCRIPT Snippets.

Simple Client-Side API Caching with `localStorage`

Optimize web application performance by implementing a basic client-side API cache using `localStorage` to store and retrieve frequently accessed data.

Fetching All Pages with Cursor-Based API Pagination

Learn to effectively retrieve all data from APIs utilizing cursor-based pagination, fetching successive pages until no more items are available.

Dynamic CORS Policy for Express.js APIs

Implement a flexible CORS policy in your Express.js API, allowing dynamic configuration of allowed origins based on environment or specific requirements.

Extract URL Query Parameters

Extract individual key-value pairs from a URL's query string using a JavaScript regular expression and iteration for easy data access.

Implementing HTTP Security Headers in Express.js

Learn to secure your Express.js application by implementing essential HTTP security headers like HSTS, CSP, X-Frame-Options, and X-Content-Type-Options using Helmet middleware.

Implementing CSRF Protection in Express.js with `csurf`

Secure your Express.js web forms and API endpoints against Cross-Site Request Forgery (CSRF) attacks using the `csurf` middleware and synchronizer tokens.

Secure Cookie Configuration for Express.js Applications

Configure HTTP-only, secure, and SameSite attributes for cookies in Express.js to enhance application security and mitigate risks like XSS and CSRF.

Implementing OAuth 2.0 Client Credentials Flow (Node.js)

Securely obtain an access token for server-to-server API authentication using the OAuth 2.0 Client Credentials Grant Type in Node.js with `axios`.

Securely Uploading Files to an API with FormData (JavaScript Frontend)

Learn how to use JavaScript `FormData` to construct and send multipart/form-data requests, securely uploading files and additional data to an API.

Real-time Data with WebSocket API Client (JavaScript)

Connect to a WebSocket API in JavaScript to enable real-time, bi-directional communication, sending messages and handling live data updates efficiently.

React Hook: useClickOutside for Modals and Dropdowns

A custom React hook, `useClickOutside`, detects clicks outside a specified DOM element, useful for closing modals, dropdowns, or popovers when users click away.

React Hook: useMediaQuery for Responsive Components

The `useMediaQuery` hook allows React components to respond to CSS media queries, enabling dynamic rendering or styling based on screen size or device features.