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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.

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