Brace Lens

A private JSON viewer for your browser. It turns raw JSON responses into a collapsible, searchable tree, entirely on your device. Free, with no account. The extension does not send document contents or make background network requests.

Effective date: 8 November 2026

Automatic viewing is on by default and uses access to all sites to recognise raw JSON. Firefox additionally changes eligible top-level HTTP(S) JSON response headers so its built-in viewer does not take over; Chrome and Edge do not change headers. See the privacy policy for scope, temporary URL handling and console access.

Collapsible tree with colour for strings, numbers, booleans and null
Filter keys and values, copy JSONPath or values
Large-file mode, JSON Lines, clear error positions
Paste viewer, light/dark theme