Developer JSON tool

JSON Formatter

Format, validate and inspect JSON with readable indentation, syntax diagnostics and useful structure statistics. Processing stays in your browser.

Input

Paste JSON to format

Local

Objects, arrays and valid JSON primitive roots are supported. Choose 2 or 4 spaces before formatting.

Indentation
Up to 5 million characters
Output

Formatted JSON

Waiting for input
JSON result will appear here

Valid input produces structure details and reusable output. Invalid input shows a readable syntax diagnostic.