JSX (JavaScript XML) is a syntax extension for JavaScript used primarily in React. It lets you write HTML-like code directly in JavaScript files, which React then transforms into function calls that create DOM elements. JSX looks like HTML but has key differences: it uses camelCase for attributes, requires closing tags for all elements, and wraps CSS styles in JavaScript objects.

What HTML attributes change in JSX?

The most common attribute changes are: class becomes className (because class is a reserved word in JavaScript), for becomes htmlFor (because for is a reserved word), tabindex becomes tabIndex, and all event handlers become camelCase (onclick becomes onClick, onchange becomes onChange). Data attributes and ARIA attributes remain unchanged.

How are inline styles handled in JSX?

HTML inline styles use a string with CSS syntax: style="color: red; font-size: 16px". JSX requires a JavaScript object with camelCase properties: style={{color: 'red', fontSize: '16px'}}. The converter transforms CSS property names to camelCase (font-size becomes fontSize, background-color becomes backgroundColor) and wraps values appropriately.

Does the converter handle HTML comments?

Yes. HTML comments like are converted to JSX comments using the syntax {/* comment */}. JSX does not support HTML-style comments because the content is processed as JavaScript. The curly braces create a JavaScript expression context, and the /* */ syntax creates a block comment within that context.

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Q: Why convert HTML to JSX?

When migrating existing HTML templates to React components, you need to convert HTML syntax to JSX syntax. The differences are subtle but important: class becomes className, for becomes htmlFor, inline styles change from strings to objects with camelCase properties, void elements like and must be self-closed, and event handlers use camelCase naming. Manually making these changes is tedious and error-prone.

Convert HTML to JSX for React. Automatically converts class to className, for to htmlFor, self-closes void elements, and transforms inline styles.

How to Use the HTML to JSX Converter

Paste your HTML code into the input area and click Convert to JSX. The tool transforms your HTML into valid JSX by converting attributes, self-closing void elements, transforming inline styles, and handling comments. The stats panel shows how many changes were made and the input and output character lengths. Use the Copy button to copy the JSX output directly into your React component file.

This tool is essential for React developers who are migrating existing HTML templates into React components, copying HTML snippets from design tools, or converting static HTML prototypes into dynamic React applications. Rather than manually changing each attribute and element, the converter handles all transformations automatically in one click.

Understanding JSX and React Components

JSX is the syntax that makes React development productive. It lets you write UI code that looks like HTML but is actually JavaScript. When you write <div className="container"> in JSX, React's build tool transforms it into a React.createElement('div', {className: 'container'}) function call. This means JSX follows JavaScript rules, not HTML rules, which is why certain attributes and patterns must change.

The most important difference is that JSX uses JavaScript naming conventions for attributes. Since class and for are reserved words in JavaScript, they become className and htmlFor respectively. All event handler attributes use camelCase: onclick becomes onClick, onchange becomes onChange, and onsubmit becomes onSubmit. These naming changes are consistent and predictable.

Attribute Conversion Rules

Beyond class and for, several other HTML attributes have different names in JSX. The tabindex attribute becomes tabIndex. The colspan and rowspan attributes become colSpan and rowSpan. The crossorigin attribute becomes crossOrigin. Boolean attributes like checked, disabled, and readonly work the same way but readonly becomes readOnly in JSX. Data attributes (data-*) and ARIA attributes (aria-*) are the exceptions and remain unchanged in JSX.

Inline Style Transformation

HTML inline styles use a CSS string: style="color: red; font-size: 16px; background-color: blue". JSX requires a JavaScript object with camelCase property names: style={{color: 'red', fontSize: '16px', backgroundColor: 'blue'}}. The converter handles this transformation automatically, converting hyphenated CSS properties to camelCase and wrapping the values in a JavaScript object literal. Numeric values for pixel-based properties can omit the 'px' unit in JSX.

Self-Closing Elements

HTML allows void elements like <img>, <br>, <hr>, and <input> to be written without a closing slash. JSX requires all elements to be explicitly closed, either with a closing tag or a self-closing slash. The converter ensures all void elements are properly self-closed: <img> becomes <img />, <br> becomes <br />, and so on. This is mandatory in JSX and will cause a compilation error if omitted.

Frequently Asked Questions

What is JSX?

JSX is a JavaScript syntax extension used in React that lets you write HTML-like code in JavaScript files. It uses camelCase attributes and requires closing all elements.

Why convert HTML to JSX?

HTML and JSX have subtle but important differences in attribute names, style syntax, element closing, and comments. Manual conversion is tedious and error-prone.

What attributes change?

class becomes className, for becomes htmlFor, tabindex becomes tabIndex, event handlers become camelCase, and readonly becomes readOnly. Data and ARIA attributes stay unchanged.

How are styles handled?

CSS string styles become JavaScript objects with camelCase properties. "font-size: 16px" becomes {fontSize: '16px'}.

Does it handle comments?

Yes. HTML comments  become JSX comments {/* comment */} wrapped in curly braces with block comment syntax.

HTML to JSX Converter

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