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To convert HTML to a React component, place the markup inside a JavaScript function that returns JSX, then update the markup for JSX’s stricter syntax. The key fixes are to wrap adjacent top-level elements, use className instead of class, and explicitly close elements such as <img />. A converter can help with a large snippet, but you still need to review its output and choose how the component fits into your app.
Convert the HTML markup to JSX
JSX looks like HTML, but it is written in JavaScript and follows stricter rules. React recommends using a converter to translate existing HTML or SVG to JSX, then checking the result. See React’s Writing Markup with JSX guide.
For example, this HTML:
<h1 class="title">Welcome</h1>
<img src="/welcome.png" alt="Welcome">can become a component like this:
export default function Welcome() {
return (
<>
<h1 className="title">Welcome</h1>
<img src="/welcome.png" alt="Welcome" />
</>
);
}The changes are JSX syntax adjustments; this example does not add dynamic behavior.
Make the markup valid JSX
- Wrap sibling top-level elements. A component must return one enclosing element. Use a meaningful element such as
<main>when appropriate, or a fragment (<>...</>) when you do not want an extra DOM element. - Close every element. JSX requires explicit closing tags. Void elements such as
<img>and<br>should be self-closing, for example<img />. - Use JSX property names. Change
classtoclassNameand use camelCase for many DOM properties, such astabIndex. Hyphenatedaria-*anddata-*attributes remain hyphenated.
These rules and other JSX examples are covered in React’s JSX guide.
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Put the JSX in a component
A React component is a function that returns UI. Save the function in a JavaScript module used by your React project, and import it wherever that UI belongs. React’s Describing the UI guide explains components and how they can be composed.
Conversion changes markup syntax; it does not decide which parts should be separate reusable components, replace fixed content with props, or implement interactions. Make those changes when the UI needs them: for example, a repeated card can become its own component, and a title that varies between pages can be passed in as a prop. Event handlers and state must also be added separately if the original markup is meant to respond to user input.
Choose how React should render the component
The correct rendering API depends on what is already on the page. React distinguishes between creating a client-rendered root and attaching to markup React rendered on the server. Its Client React DOM APIs reference documents both.
| Page situation | Use | What it does |
|---|---|---|
| A client-rendered React area | createRoot(domNode) |
Creates a React root in the selected DOM node so you can render a React element there. |
| HTML previously rendered by React on the server | hydrateRoot(domNode, reactNode) |
Attaches React to the server-generated React markup. |
Do not use hydration just because a page already contains static HTML: hydrateRoot is for markup previously generated by React. For an ordinary client-rendered area, use createRoot.
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You do not have to convert an entire site at once. React’s Add React to an Existing Project guide describes mounting a component at a chosen location while leaving the rest of the page in place. For example, the HTML can include <nav id="navigation"></nav>; JavaScript can select that element, create a root there, and render a navigation component. The guide presents Vite as one option when a project lacks a JavaScript module setup; the right integration depends on the existing site.
Handle raw HTML carefully
Most converted markup should be written directly as JSX. Avoid inserting arbitrary HTML strings with dangerouslySetInnerHTML: React warns that untrusted markup can run attacker-controlled code. If a feature requires rendering an HTML string, use only trusted or appropriately sanitized content; sites that enforce Trusted Types should apply a suitable Trusted Types policy. See React’s common DOM components reference.
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Check the conversion before using it
- Does the component return one enclosing element?
- Are void elements explicitly closed?
- Have HTML attributes been adjusted to JSX property names?
- Does the component need props, state, or event handlers that the original static markup did not contain?
- Is any HTML string being inserted at a raw-HTML security boundary?
- Are you using
createRootfor client-rendered content orhydrateRootonly for React-generated server markup?
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