JSON Formatter & Validator — Format, Beautify & Validate JSON

Format & Validate JSON

Paste messy JSON and get perfectly indented, syntax-highlighted output.

How to Use

Open the JSON Formatter tool

Paste your JSON data

See formatted output with syntax highlighting

Errors are highlighted if JSON is invalid

Features

• Beautify — indent and format for readability
• Minify — compress to single line
• Validate — check for syntax errors
• Tree view — explore nested structures

FAQ

What JSON is valid?

Objects ({}), arrays ([]), strings, numbers, booleans, and null.

Can it fix invalid JSON?

It highlights errors but doesn't auto-fix them. Common issues: trailing commas, single quotes, unquoted keys.

What's the size limit?

No fixed limit — performance depends on your browser. Handles multi-MB JSON files easily.