Free Online JSON Formatter & Validator
Beautify and validate JSON instantly. Format messy JSON, fix syntax errors, and make your data easy to read.
Sponsored
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
❓ FAQs
What does this tool do?
This tool instantly beautifies and validates JSON. It formats messy JSON into a clean, readable structure and highlights syntax errors.
Can it fix invalid JSON automatically?
If your JSON has small syntax issues like missing commas or quotation marks, the tool can often correct them automatically. For larger issues, it shows exactly where the problem is.
Will the tool change my data?
No, the tool only changes how your JSON is displayed. It preserves your keys, values, and structure exactly as they are.
Is there a size limit for the JSON input?
Most JSON files will work fine, but extremely large files may be slow to process in a browser. For huge datasets, a desktop JSON editor might be better.
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