If you've worked with React,

you've probably copied HTML into JSX at least once.

And then immediately got errors like:

• Unexpected token


• Invalid DOM property


• Adjacent JSX elements must be wrapped


• Objects are not valid as a React child

Converting HTML to JSX sounds simple,

but there are many small differences that constantly trip developers up.

In this article, we'll cover:

• HTML vs JSX differences


• common HTML to JSX mistakes


• React attribute conversion


• inline style issues


• SVG conversion problems


• how to convert HTML to JSX faster

Why JSX Exists

JSX stands for JavaScript XML.

It allows developers to write UI markup directly inside JavaScript.

Example:

function App() {

  return <h1>Hello World</h1>;

}

React transforms JSX into:

JavaScript function calls

virtual DOM elements

This makes component-driven UI development much easier.

HTML Is NOT JSX

Many beginners assume JSX is just HTML inside JavaScript.

But JSX has important differences.

For example,

this valid HTML:

<label class="title">Hello</label>

will fail in React JSX.

Correct JSX:

<label className="title">Hello</label>

Common HTML to JSX Conversion Problems

1. class → className

This is the most common mistake.

HTML:

<div class="card"></div>

JSX:

<div className="card"></div>

React uses className

because class is a reserved JavaScript keyword.

1. for → htmlFor

HTML:

<label for="email"></label>

JSX:

<label htmlFor="email"></label>

1. Inline Styles Become Objects

HTML:

<div style="color:red;"></div>

JSX:

<div style={{ color: "red" }}></div>

This is one of the biggest HTML to JSX conversion issues.

1. Self-Closing Tags

HTML allows:

<img src="image.jpg">

But JSX requires:

<img src="image.jpg" />

Same for:

input

br

hr

meta

1. Multiple Root Elements

This breaks JSX:

<h1>Hello</h1>

<p>World</p>

Correct version:

<>

  <h1>Hello</h1>

  <p>World</p>

</>

Or:

<div>

  <h1>Hello</h1>

  <p>World</p>

</div>

Why HTML to JSX Conversion Matters

Frontend developers constantly:

copy UI snippets

convert templates

migrate websites

reuse landing pages

adapt design exports

This makes HTML to JSX conversion a daily workflow.

Especially for:

React

Next.js

Gatsby

Remix

developers.

SVG Conversion Problems in JSX

SVG is another common issue.

SVG attributes often break in React.

Example:

<svg stroke-width="2"></svg>

React JSX requires:

<svg strokeWidth="2"></svg>

Many SVG attributes become camelCase.

Examples:

stroke-width → strokeWidth

fill-rule → fillRule

clip-path → clipPath

Why Developers Use HTML to JSX Converters

Manually converting HTML to JSX is annoying.

Especially for:

large templates

Tailwind components

dashboard layouts

landing pages

SVG markup

Developers often need to:

fix attributes

convert inline styles

repair invalid JSX

clean formatting

React + Tailwind HTML Conversion

Tailwind UI snippets are often copied directly into React apps.

Example HTML:

<div class="bg-blue-500 text-white p-4">

  Button

</div>

JSX version:

<div className="bg-blue-500 text-white p-4">

  Button

</div>

Even simple conversions become repetitive quickly.

Why I Built an HTML to JSX Converter

I got tired of manually fixing:

className

inline styles

invalid attributes

SVG props

every time I copied HTML into React.

So I built a browser-based HTML to JSX converter focused on frontend developers.

Features:

instant HTML to JSX conversion

React-friendly formatting

SVG conversion support

clean indentation

copy-paste workflow

local browser processing

Try it here: