Question 1

JSX (JavaScript XML)

Accepted Answer

is a syntax extension for JavaScript. It was written to be used with React to describe what the user interface should look like. JSX produces React "elements" and allows developers to write HTML structures in the same file as JavaScript code. React is a declarative, efficient, and flexible open-source JavaScript library for building user interfaces, primarily maintained by Meta. It lets developers compose complex UIs from small and isolated pieces of code called components. Transpilation is the process of reading source code written in one programming language and producing the equivalent code in another language. Because browsers cannot read JSX natively, tools like Babel must transpile JSX into standard JavaScript before the code can be executed.

Question 2

CamelCase

Accepted Answer

is a typographical convention in which the first letter of each word in a compound word is capitalized, except for the first word. For example, background-color becomes backgroundColor. JSX strictly enforces camelCase for all attributes and event handlers because JavaScript naming conventions prohibit the use of hyphens in variable names. Self-Closing Tags are elements that do not require a closing tag because they cannot contain any text or child elements. In traditional HTML, tags like ,
, and can be written without a trailing slash. In JSX, every single tag must be explicitly closed; therefore, void elements must be written with a trailing slash before the closing bracket, such as . Abstract Syntax Tree (AST) is a tree representation of the abstract syntactic structure of source code written in a programming language. Each node of the tree denotes a construct occurring in the source code.

Question 3

Why does React use JSX instead of standard HTML?

Accepted Answer

React uses JSX because modern web applications require user interfaces to be highly dynamic and state-driven. Standard HTML is static and incapable of executing logic. By using JSX, React allows developers to utilize the full computational power of JavaScript—such as .map() for rendering lists or ternary operators for conditional displays—directly alongside the structural markup. This tight coupling of logic and presentation within a single component file drastically improves code maintainability and developer velocity.

Question 4

Can I use a regular expression (Regex) to convert HTML to JSX manually?

Accepted Answer

While you can use Regex for simple find-and-replace tasks like changing class= to className=, it is highly discouraged for complete conversions. HTML is not a regular language; it features complex, infinitely nested, and irregular tree structures. Regex cannot accurately parse nested tags, properly format multi-line inline CSS strings into JavaScript objects, or identify unclosed void elements reliably. Attempting to use Regex for complex HTML to JSX conversion will inevitably result in broken code and syntax errors.

Question 5

What happens if I forget to change class to className in React?

Accepted Answer

If you paste raw HTML into a React component and leave the class attribute unchanged, the application will typically still render the styling correctly in the browser. However, the React compiler will throw a highly visible warning in the developer console, stating: "Warning: Invalid DOM property class. Did you mean className?". In strict enterprise environments utilizing continuous integration pipelines and ESLint rules, this warning will be treated as a fatal error, and the deployment build will fail completely until the attribute is corrected.

Question 6

How do HTML to JSX converters handle inline CSS styles?

Accepted Answer

Converters handle inline styles by completely dismantling the HTML style string and rebuilding it as a JavaScript object. The tool parses the string, splits it at every semicolon to separate the properties, converts the CSS property names from kebab-case (e.g., margin-top) to camelCase (e.g., marginTop), wraps the values in quotation marks, and places them inside double curly braces. For example, style="color: red; font-size: 12px;" is converted to style={{ color: 'red', fontSize: '12px' }}.

Question 7

Are there any HTML attributes that do NOT change in JSX?

Accepted Answer

Yes, there are two major exceptions to the camelCase conversion rule in JSX. All data-* attributes (used for storing custom data or selecting elements for testing, such as data-testid="button") and all aria-* attributes (used for screen reader accessibility, such as aria-hidden="true") must remain in their standard lowercase, hyphenated format. A high-quality HTML to JSX converter is programmed to recognize these specific prefixes and will intentionally bypass them during the camelCase transformation process.

Question 8

Can an HTML to JSX converter fix broken or invalid HTML?

Accepted Answer

Generally, no. Most modern converters rely on strict Abstract Syntax Tree (AST) parsers to understand the structure of the code. If the input HTML is fundamentally invalid—such as missing closing brackets, improperly overlapped tags (e.g., text), or missing quotation marks—the lexer will fail to tokenize the string, and the parsing process will crash. Developers must ensure their raw HTML is valid and well-formed before attempting to run it through a conversion tool.

Question 9

How do I convert an SVG file into a React component?

Accepted Answer

Converting an SVG is exactly the same as converting standard HTML, as SVG is simply an XML-based markup language. You copy the raw SVG code and run it through an HTML to JSX converter. The tool will automatically change the dozens of hyphenated SVG presentation attributes (like stroke-width and fill-rule) into their required camelCase equivalents (like strokeWidth and fillRule). You then wrap this converted output inside a standard React functional component, allowing you to pass props to dynamically change the SVG's color or size.

HTML to JSX Converter

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