JSON Viewer & Formatter Online | JSON Lens

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Enter JSON, then open Viewer.

JSON Lens

A focused workspace for inspecting structured data without sending pasted JSON to an application server.

What you can do

Format or compact JSON text.
Browse nested properties in a collapsible outline.
Explore relationships in a zoomable tree.
Switch between comfortable dark and light themes.

Privacy note

Pasted content is processed in your browser. The optional URL loader contacts the address you provide, and the Tree view uses the D3 library from jsDelivr.

Quick start

Paste JSON in Text.
Correct any validation error.
Open Viewer and choose Pretty, Raw, or Tree.