Home/Developer Tools/JSON Formatter

Free Online JSON Formatter & Validator

Beautify and validate JSON instantly. Format messy JSON, fix syntax errors, and make your data easy to read.

Indent Size:

Enter JSON to format

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.