Free Online JSON Formatter & Beautifier
Paste raw or minified JSON to pretty-print it with proper indentation, or catch syntax errors before they break your build. Supports customizable indentation (2 or 4 spaces, tabs), collapsible tree view, and instant validation. Everything runs locally in your browser — nothing you paste is uploaded anywhere. Essential for debugging API responses, configuration files, and data payloads.
Common questions
Is my JSON data uploaded to a server?
No. Formatting and validation both run entirely in your browser using JavaScript's built-in JSON parser. Your data never leaves your device.
Why does it say my JSON is invalid?
The most common causes are trailing commas, single quotes instead of double quotes, or missing brackets. The error message points to the character position where parsing failed.
Can I minify JSON instead of formatting it?
Yes — use our dedicated JSON Minifier tool to strip all whitespace and produce the smallest possible payload for production use.