JSON Formatter & Validator

Make unreadable JSON readable

JSON from APIs, logs and config files often arrives as one long line. This tool indents it so the structure is visible and, if it's invalid, points to the exact line and character of the problem. It uses the browser's own JSON parser, so results match the standard, and nothing you paste is sent to a server — safe for internal data or responses with personal information.

What it does

• Pretty — indent with 2 spaces, 4 spaces or tabs.
• Minify — strip whitespace and line breaks to save space; sizes before and after are shown.
• Sort keys — orders object keys alphabetically, handy for diffing two JSON documents. Array order isn't changed.
• Escape / unescape — turn text into a JSON string (quotes and line breaks become \" and \n) or the reverse; great for pulling JSON out of a log line where it was stored as a string.
• Non-ASCII as \uXXXX — for systems that only accept ASCII.

Common errors

JSON looks like JavaScript but is stricter: keys and strings need double quotes, no trailing commas, and no comments, undefined or NaN. The error message shows the offending line with a ^ marker and, for common mistakes, how to fix it. Statistics (values, depth, size) appear above the result.

To view JSON as a spreadsheet, use Excel ↔ JSON; to encode text, use Base64 Encode/Decode.