JSON Formatter & Validator
Format, beautify, and validate JSON with customizable indentation.
Free Web vs Desktop App
Web (Free)
- +JSON Formatter & Validator with basic functionality
- +No signup or account required
- +Works in any modern browser
- -Up to 10 KB input on the web
- -Single tool per page, no integrations
Desktop App ($29 one-time)
- Unlimited file size, integrated with HTTP Client & Database results
- All 16 developer utilities in one ToolBox
- Plus terminal, HTTP client, database client, Docker manager
- AI agents, code editor, Git client, and 100+ more features
- macOS, Windows, Linux — one-time purchase, own forever
About JSON Formatter & Validator
Paste messy or minified JSON and instantly get beautifully formatted output. Supports 2-space, 4-space, tab indentation and minification. Validates JSON structure and highlights errors with line numbers so you can fix malformed payloads fast.
Frequently Asked Questions
Is JSON Formatter & Validator free to use?
Yes! This online version is completely free with no signup required. Up to 10 KB input on the web. For unlimited usage and full integration with 100+ developer tools, download the 1DevTool desktop app ($29 one-time).
Is my data safe?
Absolutely. All processing happens entirely in your browser. Your data never leaves your machine — nothing is sent to any server. The tool runs 100% client-side using JavaScript.
What do I get with the desktop app?
The desktop app includes JSON Formatter & Validator with no limits, plus 15 other developer utilities. Beyond the ToolBox, you get multi-agent AI terminals, HTTP client, database client (26 engines), Docker manager, Git client, code editor, browser preview, and more — all in one workspace. $29 one-time, no subscription.
Like this tool? There's a lot more.
Download 1DevTool to get JSON Formatter & Validator with no limits, plus 15 other utilities, AI terminals, HTTP client, database client, and 100+ features.