JSON Formatter & Validator

Paste messy JSON and get it beautifully formatted, validated, or minified — instantly. Runs entirely in your browser, so even private API responses never leave your machine.

What this does

Developers use JSON formatters dozens of times a day to make API responses readable, spot syntax errors, and shrink payloads. This one tells you the exact line of any error, supports tab or space indentation, and never sends your data anywhere.

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Frequently asked questions

Is my JSON sent to a server?

No. Parsing and formatting use the browser's native JSON engine. Your data never leaves the page.

Why does it say 'Invalid JSON'?

The status line shows the parser's message and position so you can find the bad comma, quote, or bracket quickly.