Format & beautify JSON — fully offline
Paste minified or messy JSON and get clean, indented, readable output in the browser. braceful formats, validates and gives you a collapsible tree — with zero upload and zero external requests. Your JSON never leaves this page.
Free forever · No account · 2-minute setup
Try it right here — your JSON never leaves this page
This is the actual viewer, running entirely in your browser. Open DevTools, watch the Network tab: zero requests. Load a sample or paste your own.
A JSON formatter that respects your data
Most online JSON beautifiers ask you to paste your data into a text box on someone else's server. For a quick snippet that's fine — but the moment the JSON contains an API key, a customer record, or anything from a production system, "paste it into a website" becomes a question you shouldn't have to ask. braceful formats everything on your own device, so there's no trade-off between convenience and privacy.
What you get when you format with braceful:
- Clean, consistent indentation. Minified one-liners and inconsistently spaced JSON become evenly indented and easy to scan.
- A collapsible tree. Beyond pretty-printing, you can fold away whole branches and expand only what you're inspecting — far more usable than a wall of indented text.
- Validation as you go. If the input isn't valid JSON, braceful tells you — and can repair it before formatting rather than just throwing an error.
- Search across the document. Jump to any key or value without scrolling, with matches highlighted inline.
Because it's a browser extension and not a website, it's there whenever you open a JSON response — no copy-pasting into a separate tab. If your JSON won't parse, start with repair broken JSON; if the file is huge, see opening large JSON files without freezing.
JSON formatting — questions
Does the JSON formatter work offline?
Yes — completely. Formatting, validation, the tree view and search all run locally in your browser. The free viewer makes zero network requests, so your JSON is never uploaded to a server to be beautified. Open DevTools → Network and watch the request count stay at zero while you format.
What is the difference between formatting and beautifying JSON?
They mean the same thing in practice: taking minified or messy JSON and re-printing it with consistent indentation and line breaks so it is readable. braceful pretty-prints your JSON into a clean, navigable view — and gives you a collapsible tree on top, so you can fold away the parts you don't care about.
Can it format JSON that is currently invalid?
Yes. If the input doesn't parse, braceful can repair it first — fixing trailing commas, single quotes, unquoted keys and truncation — and then format the valid result. So you don't have to choose between "fix it" and "format it"; you get both.
Is the JSON formatter free?
Yes — formatting, the tree, search and validation are all in the free tier, forever, with no account. Pro adds query, reshape, export, diff, JWT decode and schema tools, but everything on this page costs nothing.
Still have a question? sherazp995@gmail.com
Beautiful JSON, none of it uploaded.
Add braceful and format JSON the instant you see it — offline, in the browser, with a tree you can actually navigate.
Free forever · No account · 2-minute setup