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codesweetly @codesweetly.com · 08/10/2026

Why Use TypeScript with Express.js? Using TypeScript in your Express application helps you detect type-related errors while writing your code or during type checking instead of discovering them in production, after your application is deployed. Learn More: leanpub.com/node-and-exp... #webdev #js

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codesweetly @codesweetly.com · 07/10/2026

Test Runner vs. HTTP Testing Tool: What’s the Difference? - Test runner: Runs your tests and reports the results. Examples include Mocha, Tape, and Jest. - HTTP testing tool: Provides an API for sending requests to your app and checking the responses. Examples include Chai HTTP and Supertest. #js

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codesweetly @codesweetly.com · 03/10/2026

What Is Cross-Origin Resource Sharing? Cross-Origin Resource Sharing (CORS) uses HTTP headers to tell the browser which origins can read a server’s responses. If the backend does not allow the frontend’s origin, the browser prevents its JavaScript from reading the cross-origin response. #webdev

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codesweetly @codesweetly.com · 02/10/2026

POST vs. GET in HTML Forms - POST: Sends form data in the request body, so it does not appear in the address-bar URL or the URL list saved in browser history or bookmarks. - GET: Adds form data to the URL, so it can appear in the address bar, browser history, bookmarks, and shared links. #webdev

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codesweetly @codesweetly.com · 02/10/2026

POST vs. GET in HTML Forms: What’s the Difference? - POST: Best suited to forms that create, update, or change the server’s state. - GET: Appropriate for forms that retrieve data without requesting a change to the server’s state, such as search forms. More: amazon.com/dp/B0HK23L2Y1 #webdev #js

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codesweetly @codesweetly.com · 01/10/2026

Client-Side vs. Server-Side Form Validation - Client-side validation: An initial check performed in the browser before form data is sent to the server. - Server-side validation: A check performed by the server after it receives the submitted form data. More: leanpub.com/node-and-exp... #nodejs

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codesweetly @codesweetly.com · 01/10/2026

Validation vs Sanitization vs Output Escaping - Validation answers the question: Is this data acceptable? - Sanitization answers: How should this data be cleaned or transformed? - Output escaping answers: How should this data be safely rendered in this output context? leanpub.com/node-and-exp...

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codesweetly @codesweetly.com · 30/09/2026

What Exactly Are EJS Template Tags? EJS template tags are special tags that use syntax such as <% ... %> and <%= ... %>. They allow you to embed JavaScript code and output values within HTML templates. Learn More: leanpub.com/node-and-exp... #nodejs #coding #webdev

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codesweetly @codesweetly.com · 30/09/2026

What Exactly Is EJS? EJS (Embedded JavaScript templating) is a templating language that lets you generate dynamic HTML by embedding JavaScript code within HTML templates using template tags. Learn More: leanpub.com/node-and-exp... #nodejs #webdev #coding

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codesweetly @codesweetly.com · 29/09/2026

Static HTML vs. Dynamic Views in Express.js - Static HTML files contain the final HTML that the server can send to the browser as-is. - Dynamic views are templates that a template engine, such as EJS, processes with data at runtime to generate HTML. More: leanpub.com/node-and-exp... #webdev #js

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codesweetly @codesweetly.com · 29/09/2026

What Are Views in Express.js? A view is a template that defines the content and structure of a webpage returned to users by an Express.js application. Learn More: leanpub.com/node-and-exp... #nodejs #javascript #webdev

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codesweetly @codesweetly.com · 28/09/2026

Why Are Routers Called Mini-Apps in Express.js? An Express router is often called a mini-app because it provides a complete middleware and routing system. Routers help organize applications by allowing you to define related routes in one place and mount them onto the main Express application. #js

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codesweetly @codesweetly.com · 28/09/2026

What Are Controllers in Express.js? A controller is a route handler or group of handlers that processes requests for specific endpoints. Controllers are often placed in separate modules to improve code organization and maintain a clear separation of concerns. leanpub.com/node-and-exp... #webdev

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codesweetly @codesweetly.com · 27/09/2026

Middleware vs Route Handler: What's the Difference? Developers often use “route handler” for the function that ultimately handles a matched route and sends the response, while preceding reusable functions are commonly called “middleware.” Syntax: app.METHOD(PATH, MIDDLEWARE1, MIDDLEWARE2, HANDLER)

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codesweetly @codesweetly.com · 26/09/2026

What Exactly Is an Express Route? A route in Express.js consists of an HTTP method, a URL path, and one or more route handler functions for processing client requests to an endpoint. Syntax: app.METHOD(PATH, HANDLER) More: amazon.com/dp/B0HK23L2Y... #nodejs #javascript #webdevelopment

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codesweetly @codesweetly.com · 25/09/2026

Syntax of an Express Route In the statement app.get('/', (req, res) => res.send('Hi!')), – app.get() is the Express route method. – '/' is the route path. – (req, res) => ... is the route handler function. Learn more: amazon.com/dp/B0HK23L2Y... #javascript #nodejs #webdevelopment

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codesweetly @codesweetly.com · 25/09/2026

What Is Express.js? Express is a web framework that simplifies server-side HTTP request handling in Node.js. It builds on Node’s HTTP capabilities with features such as routing and middleware, helping developers build web apps and APIs efficiently without repetitive code. amazon.com/dp/B0HK23L2Y1

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codesweetly @codesweetly.com · 24/09/2026

What Exactly Is the node:fs Module? The node:fs module is built into Node.js and provides many ways to work with files and directories, such as: - fs.access(): Check whether a file or directory is accessible - fs.chown(): Change file or directory ownership amazon.com/dp/B0HK23L2Y... #webdev #js

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codesweetly @codesweetly.com · 24/09/2026

Node.js HTTP Server Tip 💡 Three basic steps to setting up an HTTP server are: 1. Create a new HTTP server instance. 2. Specify the port where you want the server to listen for connections. 3. Define how the server should respond to client requests. Learn more: amazon.com/dp/B0HK23L2Y... #webdev

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codesweetly @codesweetly.com · 23/09/2026

Why Use Node.js? Node.js lets you use JavaScript beyond the web browser to build applications for a variety of environments, including servers, command-line tools, and scripts. Learn more: amazon.com/dp/B0HK23L2Y... #webdev #programming #js

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codesweetly @codesweetly.com · 22/09/2026

Is Node.js a Framework? No. Node.js is neither a framework nor a programming language. Instead, it is an asynchronous, event-driven JavaScript runtime that provides components and APIs such as: - JavaScript engine - Module systems - File system APIs Learn more: amazon.com/dp/B0HK23L2Y... #webdev

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codesweetly @codesweetly.com · 22/09/2026

What Exactly Is Node.js? Node.js is a runtime environment for executing JavaScript outside a web browser. It makes JavaScript usable in contexts beyond just web pages. Learn more: amazon.com/dp/B0HK23L2Y... #js #webdev #programming

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codesweetly @codesweetly.com · 21/09/2026

I wrote Node.js and Express.js Simplified to make learning backend JavaScript practical and approachable. You’ll learn how to: - Build web servers with Node and Express - Connect a frontend to your backend - Deploy a full-stack application amazon.com/dp/B0HK23L2Y... #webdev #programming #coding

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codesweetly @codesweetly.com · 19/09/2026

Learning Node.js can quickly become overwhelming. There are APIs, packages, servers, routes, middleware, testing, deployment, and suddenly you’re wondering where everything fits together. That’s why I wrote `Node.js and Express.js Simplified`. #NodeJS #JavaScript #webdev amazon.com/dp/B0HK23L2Y1

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codesweetly @codesweetly.com · 15/09/2026

What Exactly Is React Router? It is a routing library that lets a React app render different components based on the current URL. For instance, you can use React Router to render your project’s <App /> component when the URL is `https://codesweetly.com`. More: amazon.com/dp/B0FRC4R8T3 #webdev

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codesweetly @codesweetly.com · 14/09/2026

Single-Page vs Multi-Page Examples - Single-page: A React app using React Router in Single Page App (SPA) mode. - Multi-page: An Astro app using its default navigation or a traditional server-rendered Express.js app. Modern web apps can also combine single-page and multi-page techniques. #webdev

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codesweetly @codesweetly.com · 14/09/2026

Test Runner vs. React Component Testing Library - Test runner executes your tests, then reports the result. Eg, Jest can run your project’s index.test.js file. - React component testing library provides APIs and utilities for testing React components. Eg, rendering <App /> and querying its output.

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codesweetly @codesweetly.com · 12/09/2026

Prettier vs. ESLint vs. TypeScript - Prettier: formats your code consistently. - ESLint: analyzes your code to find potential problems and enforce configured coding standards and best practices. - TypeScript: statically checks your code to ensure values are used according to their expected types.

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codesweetly @codesweetly.com · 11/09/2026

Single-Page vs. Multi-Page Apps - Single-page: Typically does not reload after the app’s initial load unless you manually refresh the page or trigger a full-page navigation. - Multi-page: Typically loads a new HTML document when users navigate to another URL. More: amazon.com/dp/B0FRC4R8T3 #js

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codesweetly @codesweetly.com · 11/09/2026

Single-Page vs Multi-Page Apps - A single-page web app loads a single HTML page from the server and uses browser-side JavaScript to update its content as users navigate between URLs. - A multi-page web app typically loads a new HTML page from the server each time users navigate between URLs. #js

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codesweetly @codesweetly.com · 10/09/2026

What Is Prop Drilling in React? It means passing props from a parent component to a deeply nested child via multiple intermediary components It can become impractical in large apps, so consider using Context to share data across a UI tree without passing it through every intermediary component

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codesweetly @codesweetly.com · 10/09/2026

What Is React Context? React Context lets a component provide values to any of its descendant components, regardless of how deeply nested they are. It helps avoid prop drilling when many components need access to the same data. Find out more: amazon.com/dp/B0FRC4R8T3 #webdev #coding #js

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codesweetly @codesweetly.com · 09/09/2026

<select> Element in HTML vs. React In HTML, you specify an initially selected <option> by adding the selected attribute to the desired <option>. In React, a controlled <select> uses the value prop to specify its currently selected option. An uncontrolled <select> uses the defaultValue prop. #js

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codesweetly @codesweetly.com · 09/09/2026

<textarea> Element in HTML vs. React In HTML, you specify a textarea’s initial value between its opening and closing tags In React, a controlled textarea uses the value prop to specify its current value. In contrast, an uncontrolled textarea uses the defaultValue prop to specify its initial value.

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codesweetly @codesweetly.com · 08/09/2026

How Does React Implement an Uncontrolled Form Field? By allowing the DOM to maintain the field’s current value instead of controlling it with React state. To access uncontrolled form values, use tools like: - useRef - FormData - action prop - formAction prop amazon.com/dp/B0FRC4R8T3 #webdev #js

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codesweetly @codesweetly.com · 07/09/2026

How Does React Implement a Controlled Form Component? React uses the value prop (or the checked prop) to control a form field’s current value. An onChange event handler typically updates the state whenever the field changes. This makes React the source of truth for the form field’s value #webdev

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codesweetly @codesweetly.com · 07/09/2026

Types of Fields in React Forms Form fields in React can be controlled or uncontrolled: - Controlled: A form field whose current value is controlled by React, typically through state and a value prop - Uncontrolled: A form field whose current value is maintained by the DOM rather than React #js

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codesweetly @codesweetly.com · 07/09/2026

What Are External Systems in React Effects? External systems are systems outside React’s control that your component may need to synchronize with while it is mounted. Examples include browser APIs, network connections, subscriptions, timers, and third-party libraries. amazon.com/dp/B0FRC4R8T3

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codesweetly @codesweetly.com · 05/09/2026

React Effect Hook Tips - Effects are best used to synchronize components with external systems. - Objects and functions created inside a component usually have a new identity on every render. - Static objects and functions are often best declared outside the component. amazon.com/dp/B0FRC4R8T3

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codesweetly @codesweetly.com · 03/09/2026

Dependency Array Tips in React - Providing multiple items in a dependency array makes the Effect re-run when any of those dependencies change - The dependency array should include all reactive values referenced in the Effect - You can make a value non-reactive by moving it outside the component

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codesweetly @codesweetly.com · 02/09/2026

When Does React Run an Effect? It depends on the Effect's dependency array: - No dependency array: after every render. - Empty dependency array: after the component's first render. - Dependencies specified: after the first render and again whenever one or more dependencies change. #js #webdev

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codesweetly @codesweetly.com · 01/09/2026

Is the useRef().current Property a Reactive Value? No. A ref's current property is not a reactive value. Changing it does not trigger a re-render. Therefore, ref.current should not be included in an Effect's dependency array because React does not track changes to it. #js #webdev

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codesweetly @codesweetly.com · 31/08/2026

Is the Object Returned by useRef a Reactive Value? No. React guarantees that the useRef Hook returns the same ref object on every render. Therefore, the ref object has a stable identity and does not need to be included in an Effect's dependency array. #webdev #js More: amazon.com/dp/B0FRC4R8T...

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codesweetly @codesweetly.com · 29/08/2026

Should Functions or Objects Be in a Dependency Array in React? Objects created during rendering have a new identity on each render. Adding them as dependencies can cause the Effect to re-sync more than necessary. If needed only by the Effect, consider declaring them directly in the Effect instead.

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codesweetly @codesweetly.com · 26/08/2026

Are All Functions and Variables Reactive Values in React? Yes. Functions and variables declared in a component are reactive because they can be different on each render. However, values declared outside the component are not reactive values of that component. #webdev amazon.com/dp/B0FRC4R8T...

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codesweetly @codesweetly.com · 25/08/2026

Why Are React Props Reactive Values? Props are reactive because they can change between renders when the parent component passes different values to the component. Therefore, when an Effect reads a prop, that prop needs to be considered when React determines whether the Effect should re-sync. #js

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codesweetly @codesweetly.com · 24/08/2026

What Are Reactive Values in React? They are values that can change between renders and therefore need to be considered when React re-synchronizes an Effect. They include props, state, and variables or functions declared in a component. Values derived from these reactive values are also reactive.

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codesweetly @codesweetly.com · 22/08/2026

How to Specify When React Effects Should Run Provide an array as useEffect's second argument. Then list all the reactive values you've used in the setup function. By doing so, React runs the Effect after the initial render and subsequently after a re-render if any of the dependencies have changed.

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codesweetly @codesweetly.com · 20/08/2026

Effect's Setup Code vs. Cleanup Function - A setup code describes how a component should start a synchronization process with an external system. - A cleanup function describes how the component should stop or undo that sync process before the Effect is re-synchronized or the UI is unmounted. #js

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codesweetly @codesweetly.com · 19/08/2026

When Does React Run an Effect's Cleanup Function? 1. When useEffect's dependencies change, React runs the cleanup function from the previous Effect before running the new Effect. 2. React runs the cleanup function one final time after removing the component from the DOM. amazon.com/dp/B0FRC4R8T3

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