JSON Formatter & Validator
$0.00
Format & validate JSON — free forever. JSON Formatter & Validator is a practical single-file tool you own outright — no subscription, no login.
• Format messy JSON with 2-space, 4-space or tab indentation in one click
• Validate instantly — clear error message plus a tip for the usual causes (trailing commas, single quotes, unquoted keys)
• Minify to a single line when you need compact JSON for configs or APIs
• Useful stats — key count, maximum nesting depth and size for every payload
• Copy-result button and a working sample so you can test every feature in seconds
• 100% free and 100% offline — your JSON never leaves your browser, safe for API keys and client data
Broken JSON wastes real debugging time, and pasting sensitive payloads into random websites is a privacy risk. This free tool formats, validates and minifies JSON entirely in your browser. Validation errors are explained in plain language with the most common causes, and every run reports key count, nesting depth and payload size — handy for API work, config files, and checking responses before you ship. WHAT IT DOES: the 6 features in the short description. HOW TO USE: 1. Download free after checkout, unzip, and double-click json-formatter-validator.html — it opens in any modern browser, no install, no signup. 2. Paste your JSON and format, validate or minify. WHO IT’S FOR: Developers, digital nomads, online sellers and anyone working with APIs or config files. WHAT YOU GET: json-formatter-validator.html in the downloadable ZIP (works offline, yours forever), free lifetime updates, instant download after checkout.
