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Regular formatted display of JSON, plus automatic formatting/conversion for API interface testing (GET, POST, POST-JSON).
About this tool
Regular formatted display of JSON, plus automatic formatting/conversion for API interface testing (GET, POST, POST-JSON).
JSON Formatting is a free developer tools tool that runs entirely in your browser — nothing to install, no account to create, and your data never leaves your device. Open the page, add your input, and get a clean, copy-ready result in seconds.
Open JSON Formatting on AltFTool — it loads instantly in your browser.
Paste or upload your source content.
Choose the target format or conversion mode.
Copy or download the converted result.
Move text, files, or encoded data into exactly the format your workflow expects — no desktop software needed.
Preview the converted result so you catch issues before it reaches an app, document, or message.
Every output is one click away from being copied, downloaded, or dropped into your next task.
Yes — JSON Formatting is completely free on AltFTool, with no signup, no trial limits, and no hidden costs.
Yes. JSON Formatting runs in your browser, so what you enter or upload stays on your device instead of being sent to a server.
Regular formatted display of JSON, plus automatic formatting/conversion for API interface testing (GET, POST, POST-JSON). It's built for quick, everyday developer tools tasks with results you can copy or download straight away.
Yes — JSON Formatting works in any modern browser, on desktop, tablet, and mobile, with the same features everywhere.