Validador JSON

Validar a sintaxe e a estrutura do JSON

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About This Tool

The JSON Validator is a professional-grade validation tool designed for developers who need to ensure their JSON data is correctly formatted and error-free. This tool performs comprehensive syntax checking, structural validation, and compliance verification according to JSON specifications. Built with privacy in mind, all validation happens locally in your browser. Your data never leaves your device, making it safe to validate sensitive information like configuration files, API responses, or production data. The validator uses industry-standard JSON parsing engines, ensuring accurate and reliable results. Whether you're debugging a production issue, developing a new feature, or learning JSON fundamentals, this validator provides instant feedback with detailed error messages. It highlights exactly where issues occur, shows line and column numbers, and suggests corrections, saving you valuable development time.

How to Use This Tool

Paste Your JSON Data

Copy your JSON content and paste it into the input area. You can validate JSON from any source: API responses, config files, or code you're writing. Drag-and-drop JSON files or use the file upload button for convenience.

Review Validation Results

The validator checks your JSON syntax instantly. Green checkmarks mean valid JSON. If errors are found, they're highlighted with specific line and column numbers, plus clear error messages explaining what's wrong.

Fix Issues and Re-validate

Use the error details to locate and fix JSON problems. The real-time validation updates as you type, so you can verify fixes immediately. Once all errors are resolved, you have valid, production-ready JSON.

Technical Implementation

This tool is built using modern JavaScript and runs entirely in your web browser. The JSON processing uses industry-standard parsing libraries that strictly follow official JSON specifications. All operations complete in milliseconds for typical inputs, with performance optimized for both speed and accuracy. The implementation is client-side only - your data never leaves your device. The tool works offline once loaded, requires no cookies, and includes no tracking. This ensures complete privacy for sensitive data. Supported browsers include Chrome 90+, Firefox 88+, Safari 14+, and Edge 90+. The tool is mobile-responsive and works on tablets and smartphones, though desktop browsers provide the best experience for large datasets.

Best Practices & Tips

✓Validate early and often. Run validation after each significant change to JSON files. This helps catch syntax errors immediately when they're easiest to fix, especially with complex nested structures.
✓Use error messages to learn JSON syntax. Each error includes line and column numbers plus detailed descriptions. Understanding these messages improves your JSON skills and helps avoid similar mistakes.
✓Test with edge cases. Try validating empty values, very large files, deeply nested structures, and unusual characters. This ensures your production JSON handles all scenarios gracefully.
✓Integrate into your development workflow. Bookmark this tool or add it to your editor. Many developers validate JSON from external sources (APIs, user uploads, config files) before using it in production.

Troubleshooting Common Issues

Problem: Syntax error or unexpected token in JSON

Solution: Check the exact line and column number shown in the error message. Common issues include missing commas, unclosed brackets/braces, or unescaped special characters. JSON requires strict syntax.

Example: Line 15: "Unexpected token }" usually means a missing comma on line 14, or an extra closing brace.

Problem: File too large or validation seems slow

Solution: For JSON files over 5MB, validation may take several seconds. For extremely large files (>10MB), try breaking them into smaller sections or use a desktop validator.

Example: A 15MB JSON file might take 10-15 seconds to validate in the browser, which is normal for client-side processing.