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How to Validate JSX - Step by Step Guide

Step 1

Input Your JSX Code

Submit your JSX code or TSX code for comprehensive validation. Our validator, powered by Babel parser, catches both syntax and semantic errors:

•
Paste directly: Copy your JSX/TSX code from your editor and paste it into the validator
•
Upload a file: Click "Upload" to select .jsx, .tsx, .js, or .ts files from your computer
•
Try the sample: Load example code with common JSX errors to see how validation works

Example: JSX Input for Validation

Paste any JSX or TSX code to check for errors:

import React from 'react';

function UserProfile({ user }) {
  return (
    <div className="profile">
      <img src={user.avatar} alt={user.name} />
      <h2>{user.name}</h2>
      <p>{user.bio}</p>
    </div>
  );
}
Step 2

Review Validation Results

Our validator performs comprehensive checks to catch both JSX syntax errors and semantic issues that could break your React application. Similar to ESLint but specialized for JSX validation:

•
Syntax validation: Uses Babel parser to catch unclosed tags, missing brackets, and malformed JSX
•
Attribute errors: Detects incorrect attribute names like class (should be className) or for (should be htmlFor)
•
Event handlers: Checks for lowercase event handlers like onclick (should be onClick with camelCase)
•
Import validation: Verifies React imports and catches typos like 'react111' instead of 'react'
•
Style attributes: Ensures inline styles are objects {} not strings, following React conventions

Example: What The Validator Checks

The validator performs comprehensive checks on your code:

// ✓ Syntax validation with Babel
<div className="card">
  <h1>Valid JSX</h1>
</div>

// ✓ Import validation
import React from 'react';  // Valid
import { useState } from 'react';  // Valid

// ✓ Attribute checking
<label htmlFor="email">Email</label>  // Correct
<div className="container">...</div>  // Correct

// ✓ Event handler validation
<button onClick={handleClick}>Click</button>  // Correct
Step 3

Fix Issues and Re-validate

Use the detailed error messages to fix your JSX code and ensure it's production-ready:

•
Clear error messages: Each error includes the line number, description, and suggested fix
•
Edit and re-validate: Make corrections directly in the editor and validation updates automatically
•
Success confirmation: When all issues are resolved, you'll see a green checkmark with "Valid JSX!"
•
Copy corrected code: Use the copy button to get your validated, error-free JSX

Example: Valid JSX Code

After validation, your JSX should look clean and error-free:

import React from 'react';
import { useState } from 'react';

function ContactForm() {
  const [email, setEmail] = useState('');

  return (
    <div className="container">
      <label htmlFor="email">Email</label>
      <input
        type="text"
        id="email"
        className="input-field"
        value={email}
        onChange={(e) => setEmail(e.target.value)}
      />
      <button onClick={() => console.log(email)}>
        Submit
      </button>
    </div>
  );
}

✓ All attributes use correct JSX syntax • ✓ Valid React imports • ✓ Proper event handlers

Frequently Asked Questions

What JSX errors does this validator check?

The validator checks for common JSX issues including: incorrect attribute names (class vs className), improper event handler casing, unclosed self-closing tags, inline style strings instead of objects, missing key props in lists, and unmatched brackets.

Does this replace ESLint or TypeScript?

No, this is a quick online checker for common JSX syntax issues. For comprehensive validation, use ESLint with React plugins and TypeScript in your development environment. This tool is great for quick checks and learning.

Can I validate TypeScript JSX (TSX)?

Yes! The validator works with both JSX and TSX files. It focuses on JSX-specific syntax issues that are common to both JavaScript and TypeScript React code.

Is the JSX validator free?

Yes, completely free with no limitations. Perfect for React developers learning JSX syntax or quickly checking code for common mistakes. You can also use our HTML to JSX converter to convert HTML to valid JSX.

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