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How to Fix JSX Errors - Step by Step Guide

Step 1

Paste Your Broken JSX / React Code

Got broken JSX that's causing syntax errors in your React app? Let's fix it! After fixing, use our JSX validator, JSX formatter, or convert JSX to TSX. Paste your problematic JSX code:

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Paste broken JSX: Copy error-prone code from your React components, JSX expressions, and event handlers

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Fix common errors: Automatically repairs className issues, unclosed tags, incorrect event handlers, and missing fragment wrappers

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Try sample JSX: Click "Sample" to load broken JSX and see the tool in action

Note: For very large JSX files, the server may not be able to handle the processing. Please use smaller JSX chunks for best results.

Example: Common JSX Errors

Here are typical JSX syntax errors that break React components:

function UserCard() {
  return (
    <div class="card">
      <img src="avatar.png">
      <h2>User Name</h2>
      <button onclick="handleClick()">
        Click Me
      </button>
    </div>
    <div class="footer">
      <p>Footer content</p>
    </div>
  )
}
Step 2

Review Error Detection

The tool automatically scans your JSX and identifies all syntax errors with precise locations and descriptions:

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Error highlighting: See exactly where each syntax error occurs in your JSX code

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Detailed descriptions: Get clear explanations of what's wrong and how to fix each issue

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Line numbers: Pinpoint exact locations of errors for easy identification

Most Common JSX Errors and How to Fix Them

1. Using class Instead of className

In JSX, the HTML class attribute must be written as className since class is a reserved word in JavaScript.

❌ Wrong:

<div class="container">

✅ Correct:

<div className="container">
2. Unclosed JSX Tags (Self-Closing Elements)

Void HTML elements like img, input, and br must be self-closed in JSX.

❌ Wrong:

<img src="photo.png"> <input type="text">

✅ Correct:

<img src="photo.png" /> <input type="text" />
3. Lowercase Event Handlers

JSX uses camelCase for event handlers, not lowercase HTML attributes.

❌ Wrong:

<button onclick={handleClick}>

✅ Correct:

<button onClick={handleClick}>
4. Missing Fragment Wrapper for Adjacent Elements

JSX expressions must have one parent element. Use a fragment to wrap adjacent elements.

❌ Wrong:

return ( <h1>Title</h1> <p>Text</p> )

✅ Correct:

return ( <> <h1>Title</h1> <p>Text</p> </> )
Step 3

Apply Fixes and Validate

Use the auto-fix feature to correct errors, then validate your fixed JSX:

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Auto-fix: Automatically correct common errors like className, self-closing tags, and event handler casing

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Validation: Confirm your JSX is now valid and ready to use in your React project

Best Practices for Writing JSX

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Always Use className Instead of class:

JSX requires className for CSS classes since class is a reserved JavaScript keyword. Learn more in the React JSX conversion guide.

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Use Self-Closing Tags for Void Elements:

Elements like <img />, <input />, <br />, and <hr /> must always be self-closed in JSX.

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Add key Prop to List Items:

When rendering lists, always provide a unique key prop to each element. Read more about keeping list items in order with key.

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Use ESLint with eslint-plugin-react:

Catch JSX errors early by using eslint-plugin-react in your project. It enforces JSX best practices and catches common mistakes.

Frequently Asked Questions

What is JSX?

JSX is a syntax extension for JavaScript that lets you write HTML-like markup inside JavaScript files. It is used by React to describe what the UI should look like. JSX gets compiled to regular JavaScript function calls by tools like Babel.

How do I fix broken JSX online?

Simply paste your broken JSX code into the editor above, and the tool will automatically detect syntax errors like missing className, unclosed tags, incorrect event handlers, and missing fragment wrappers. Click the fix button to apply corrections instantly.

Can the fixer handle Next.js and Gatsby components?

Yes! The JSX fixer works with any JSX syntax regardless of the framework. It handles Next.js pages, Gatsby components, and standard React components. The tool focuses on JSX syntax correction, which is universal across all React-based frameworks.

What JSX errors can this fixer repair?

The fixer handles common issues like class to className conversion, unclosed self-closing tags (img, input, br), lowercase event handler attributes (onclick to onClick), missing fragment wrappers for adjacent elements, and other common JSX syntax mistakes.

Is the JSX fixer free to use?

Yes, completely free with unlimited usage and no registration required. Fix as many JSX files as needed with full error detection and auto-correction features at no cost.

Can I convert my fixed JSX to other formats?

Absolutely! After fixing your JSX, you can use our JSX to TSX converter to add TypeScript support, the JSX to HTML converter for static markup, or the JSX formatter to clean up your code style.

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