A free, no-sign-up JSON formatter, validator, and explorer. Paste or upload JSON, get it validated instantly with a precise line/column error if something's broken, and explore the structure as a collapsible tree with live breadcrumb paths.
As a full-stack dev working with REST APIs (Express/Node backends, GitHub's public API, PostgreSQL-backed services), I constantly end up staring at raw, unformatted JSON responses while debugging — checking payload shapes, hunting for a missing key, or figuring out why a nested field isn't where I expect it. I wanted something faster than copy-pasting into five different online formatters that are full of ads and don't show you exactly where the syntax broke.
- Validate — real JSON.parse validation with exact line/column error reporting
- Explorer tree — collapsible, color-coded tree view of the parsed structure
- Live breadcrumb — hover any node to see its full path from root
- Format / Minify — pretty-print with 2-space indent, or collapse to one line
- Copy / Download — copy formatted JSON to clipboard, or download as
formatted.json - File upload — load a
.jsonfile directly instead of pasting - Runs entirely in the browser — nothing is sent to a server; your data never leaves your machine
- Next.js 16 (App Router)
- TypeScript
- Tailwind CSS v4
- Deployed on Vercel's free Hobby plan
npm install
npm run devOpen http://localhost:3000.
npm run build
npm run startBuilt by Amardeep Chouhan · amardeepchouhan456@gmail.com