Private JSON Formatter
Format, minify and validate JSON, YAML or SQL without sending a single character over the network. Built for tokens, connection strings and configs you would never paste into a cloud tool.
Format and check securely
Paste a snippet, choose a mode and inspect the result. Validation updates as you type.
Nothing is uploaded, saved to local storage or written to disk. Closing this tab discards your text.
Your formatted code appears here
Start typing or paste a snippet to format it locally.
Tip: press Ctrl / ⌘ + Enter to run a check.
Three local steps
How it works
No account. No server parser. No waiting on a request.
Drop in JSON, YAML or SQL exactly as it appears in your editor. Credentials stay in the textarea.
Beautify, minify or convert. The parser checks structure immediately after every change.
Take the formatted text back to your workflow, or download it as a local file generated from a Blob.
Privacy, structurally
Sensitive data has nowhere to go
Zero API routes
Formatting, validation, copy and download are inline vanilla JavaScript. There is no /api endpoint to inspect your text.
No storage or traces
No localStorage, cookies, analytics or disk writes. Refresh or close the tab and the snippet is gone.
Hard 2 MB stop
Oversized input is rejected instead of truncated, so a half-parsed token can never look like a valid result.
Questions
Frequently asked
Everything below happens in the page you are reading.
Does the tool send my JSON or credentials anywhere?
No. There are no fetch calls, API routes or third-party scripts in the formatter. The page is server-rendered once; after that, all parsing and formatting are local JavaScript.
What JSON errors can it locate?
JSON validation uses the browser's native JSON parser. When the engine exposes a position or line/column pair, the issue card jumps directly to that line in the input.
How complete is the YAML and SQL support?
YAML support covers common mappings, sequences, flow collections, comments, quoted scalars and block scalars; anchors and aliases are reported as unsupported. SQL support is a structural pretty printer and quote-aware checker, not a full database dialect parser.
Why is there a 2 MB limit?
The cap keeps the page responsive on phones and small laptops. Inputs above it are left untouched and rejected with a clear message rather than being silently cut short.