Free Online JSON Formatter & Validator
Beautify and validate JSON instantly. Format messy JSON, fix syntax errors, and make your data easy to read.
Format & Beautify
Make JSON readable with proper indentation and structure.
Validate JSON
Check for syntax errors and ensure your JSON is valid.
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What is a JSON Formatter?
A JSON Formatter is an essential tool for developers that converts raw, unstructured JSON data into a readable and well-indented format. Whether you're working with an API, configuring a service, or reviewing logs, formatted JSON makes your life easier by revealing structure and errors.
💡 Key Features
- Beautify JSON: Automatically indent JSON objects
- Live Validation: Instantly highlight errors and syntax issues
- Color-coded: Syntax highlighting for improved visibility
- Copy/Download: One-click export of formatted JSON
- Custom Indentation: Choose 2, 4, or 8 space formatting
🚀 Use Cases
- Debugging malformed JSON
- Making API responses human-readable
- Validating configuration files
- Presenting JSON in documentation
🛠️ Best Practices & Common Errors
✅ JSON Best Practices
- Use consistent indentation
- Use double quotes around keys
- Validate before using in production
- Keep structures flat when possible
- Use correct data types (e.g. strings, numbers)
❌ Common Mistakes
- Trailing commas
- Single quotes instead of double quotes
- Comments in JSON (not supported)
- Unescaped characters like backslashes
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