Format (pretty print), minify, validate, syntax highlight, collapsible tree view, copy path.

Shows error location?

Yes, highlights exact line/column of syntax errors.

Handles large files with virtualized tree view.

Free JSON Formatter & Validator

Paste your JSON, hit format — get clean, readable, syntax-highlighted output in seconds. Also validates, minifies, sorts keys, and shows line numbers. Everything runs in your browser.

Indent:

Sort keys

Output

Quick Answer

JSON Formatter is a Format, validate, and minify JSON with syntax highlighting. Tree view, path copy, and error location. by ThinkaBell. It runs all processing happens locally in your browser — no sign-up, no file uploads, and no data ever leaves your device.

Feature: Format (pretty print) and minify JSON
Feature: Syntax validation with exact line/column error location
Feature: Collapsible tree view for large JSON structures
Feature: Copy JSON path for easy reference
Feature: Privacy-first — all processing happens in your browser
Feature: Completely free with no account required
Feature: Works on desktop, tablet, and mobile browsers
Feature: No data sent to servers — your JSON stays on your device
Privacy-first: no data collection, no tracking, no uploads.
Free forever: no premium tiers, no hidden charges, no accounts.

Key Terms

Web Application: A web application that runs entirely in your browser using HTML, CSS, and JavaScript. No software installation, no account creation, and no file uploads to external servers.
Client-Side Processing: All calculations and data processing happen on your device. Your information never leaves your browser, ensuring complete privacy and security.
Developer Tools: A utility accessible through a web browser at no cost. ThinkaBell tools are free with no premium tiers, no usage limits, and no account requirements.