How to format JSON in Notepad++ or VS Code?

In VS Code, use the shortcut Shift + Alt + F (Windows) or Shift + Option + F (Mac). Alternatively, use Toolifia JSON Formatter online in your browser with no plugins required.

Why is my JSON failing validation?

Check for unquoted property keys, single quotes instead of double quotes, or trailing commas after the last element.

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JSON Formatter Online Free (Beautifier & Validator)

Format, validate, beautify, and minify JSON data online for free with error detection and syntax highlighting. No login required.

4.9 / 5(4200 votes)

Execution Mode

100% Client-Side In-Browser

Data Privacy

Zero Persistent Storage

Access Policy

Free · No Signup Required

JSON Actions:

Raw JSON Input

Formatted Output

{"name":"Toolifia","status":"active","tools":300}

How to Use JSON Formatter Online Free (Beautifier & Validator)

1
Paste unformatted or stringified JSON.
2
Click 'Format / Validate'.
3
Review errors or copy beautified output.

Key Features

Syntax error pinpointing
Indentation control (2 or 4 spaces)
One-click minification
Collapsible tree visualizer

Benefits

Debug broken API responses in seconds
Reduce JSON payload size for production
Beautify messy JSON data

Common Pitfalls to Avoid

• Leaving trailing commas in JSON objects, which causes syntax errors.

Data Handling & Privacy Notice

This utility executes entirely client-side in your web browser. No text, calculations, or uploaded data are sent to our servers or stored in any database.

Frequently Asked Questions

A valid JSON format consists of key-value pairs wrapped in curly braces {}, with double-quoted string keys and supported values (strings, numbers, booleans, arrays, or objects). Example: {"name": "Toolifia", "active": true}.