ToolNests

JSON Formatter – Free, Fast & Accurate

Format, validate, and beautify JSON instantly. Free online JSON formatter with syntax highlighting. No signup, unlimited use. Best JSON tool in 2025

Syntax highlightingAuto validationOne-click copy

JSON Formatter & Converter

A simple and powerful tool to format, validate, and convert your JSON data instantly.

Enter valid JSON to see formatted output

How to json formatter in 3 Seconds

1

Paste JSON

Paste your JSON data into the input area. Or upload a JSON file directly.

2

Auto Format

Click format to beautify your JSON with proper indentation and syntax highlighting.

3

Copy & Use

Copy the formatted JSON or download it. Validated and ready to use in your projects.

Features

Syntax highlighting
Auto validation with error detection
Format and minify toggle
One-click copy to clipboard
Collapsible tree view
Error highlighting with line numbers

People Also Ask

How do I format JSON online for free?

Paste your JSON into ToolNest's JSON formatter and click format. Get beautifully formatted, validated JSON instantly. No signup required, completely free.

Can I validate JSON syntax?

Yes! Our JSON formatter automatically validates your JSON and highlights any syntax errors with line numbers and detailed error messages.

Does JSON formatter minify JSON?

Yes! You can both format (beautify) and minify JSON. Switch between formatted and minified views with one click.

Is my JSON data safe?

Absolutely. All JSON is processed in your browser. We never send your data to servers or store it anywhere. Your data stays private.