JSON Formatter
Format, validate, explore & share — instantly
Runs in your browser
Indent
Paste JSON and hit Format.
Your data never leaves your device — parsing and share links are built entirely in your browser, never uploaded or stored on a server.
About
Readable JSON is easy to trust; broken JSON is easy to miss. Devbelt's formatter pretty-prints and validates in the same keystroke — pointing you to the exact line and column the moment something is off, letting you walk deep payloads in a collapsible tree, and minifying or sharing the result when you're done. All of it runs in your browser, so even the messiest production dump never leaves your machine.
Frequently asked questions
How do I format JSON online?
Paste your JSON into the input box and click Format (or press Ctrl/Cmd + Enter). Devbelt instantly pretty-prints it with your chosen indentation — 2 spaces, 4 spaces, or tabs — and validates it at the same time.
Is my data safe? Is the JSON uploaded anywhere?
No. All formatting, validation, the tree view and even share links happen entirely in your browser using JavaScript. Your JSON is never sent to or stored on any server.
What does “Invalid JSON” mean and how do I fix it?
It means there is a syntax error — commonly a trailing comma, a missing quote, or an unclosed bracket. Devbelt shows the exact line and column of the problem so you can jump straight to it and fix it.
What is the difference between formatting and minifying JSON?
Formatting (beautifying) adds indentation and line breaks to make JSON readable. Minifying removes all unnecessary whitespace to make the JSON as small as possible for transport or storage.
Can I share formatted JSON with someone?
Yes. Click Share and Devbelt encodes your JSON into the link itself. Opening that link loads the JSON automatically — and because it lives in the URL, nothing is ever uploaded or made public.