Clean JSON Viewer — JSON Formatter & Beautifier

About

Clean JSON Viewer turns any raw JSON page into a clean, readable, syntax-highlighted tree — automatically. Open a JSON endpoint, a *.json file or a REST response and it instantly formats and beautifies it: collapsible objects and arrays, color-coded keys and values, and clickable URLs. No button to press.

WHAT IT DOES
• Auto-formats and pretty-prints any page whose body is JSON — REST APIs, *.json files, even localhost dev servers.
• Collapsible tree: fold and unfold objects and arrays, with item counts.
• Syntax highlighting for keys, strings, numbers, booleans and null. URLs become clickable.
• Toggle between Parsed and Raw views any time.
• Automatic light and dark theme — follows your system setting.
• Leaves every non-JSON page completely untouched.

WHY CLEAN JSON VIEWER IS DIFFERENT
• Open source and inspectable.
• Zero permissions. It declares no Chrome permissions and no host permissions at all.
• Zero network. It never makes a single request — your data is read and rendered locally and never sent anywhere.
• No tracking, no adware, no account. It is a pure formatter: JSON in, readable tree out.

The most popular JSON formatter went closed-source and started injecting adware and tracking while still claiming to be clean. Clean JSON Viewer is the honest alternative: it formats your JSON and does absolutely nothing else.