JSON Formatter & Validator
Format, validate, and beautify JSON data online for free. Instantly prettify messy JSON or minify it for production use with our fast JSON formatter tool
Examples
JSON Formatter FAQ and Usage Guide
What is JSON?
JSON (JavaScript Object Notation) is a lightweight text-based format for storing and transmitting data. It consists of key-value pairs and is both human-readable and machine-parseable.
Why do I need JSON formatting?
API responses and configuration files often contain minified JSON displayed as a single line. Formatting adds indentation and line breaks, making the structure easy to understand.
When should I use Minify?
Use minify when sending JSON data via API or when you need to reduce file size. It removes whitespace and line breaks to minimize data size.
Why does JSON validation fail?
Common causes:
- Missing commas or trailing commas (after the last item)
- Using single quotes (') instead of double quotes (")
- Missing quotes around key names
- Mismatched braces () or brackets ([])
How do I handle UTF-8 encoding issues?
JSON uses UTF-8 encoding. If special characters appear broken, verify your file is saved as UTF-8. This tool processes everything in your browser, so encoding issues don't occur.
Is my data secure?
Yes! All processing happens only in your browser. Your JSON data is never sent to our servers and is not stored anywhere.
Can I use this JSON formatter for large files?
This tool works best for JSON files up to a few megabytes. For very large files (10MB+), your browser may slow down. For massive JSON files, consider using command-line tools like jq or specialized desktop applications.
What's the difference between format and prettify?
They're the same thing! "Format," "prettify," and "beautify" all mean adding indentation and line breaks to make JSON readable. Our tool formats JSON with customizable indentation (2 or 4 spaces) to match your coding style.