JS Tools

Online JSON Viewer

Pretty‑print, expand/collapse, and inspect JSON with syntax highlighting for rapid debugging.

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How to use

  1. Paste or type your input in the left editor
  2. Adjust options in the toolbar if available
  3. Copy or download the output from the right pane

This free online tool runs entirely in your browser. No sign‑up, no server uploads.

About JSON Viewer

Pretty‑print, expand/collapse, and inspect JSON with syntax highlighting for rapid debugging.

The JSON viewer parses your raw JSON input and constructs an interactive tree representation using a recursive component architecture. Each node in the tree is rendered with expand/collapse controls, type-specific color coding, and indentation guides. For large documents, the viewer uses virtualized rendering so that only the currently visible portion of the tree is in the DOM, ensuring smooth performance even with thousands of nodes.

Use the left editor to enter your data. The output updates in real time. You can copy, clear, download, or expand either pane.

Tip: Use the search bar to quickly switch between tools.

Sample JSON

{
  "name": "Jane",
  "age": 29,
  "skills": ["js","html","css"]
}
Example input shown above. Output appears in the right pane instantly.

Why this tool?

FeatureJSON ViewerTypical alternatives
Free online toolYesOften yes
Client‑side only (privacy)YesVaries
No sign‑up requiredYesVaries

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FAQs

Can I expand and collapse nested JSON objects in the tree view?
Yes. The JSON viewer renders your data as an interactive tree where every object and array node is collapsible. Click any node to toggle it, or use the expand-all and collapse-all controls to navigate large structures quickly.
Does the viewer display data types for each value?
Each value in the tree is color-coded by type: strings, numbers, booleans, null values, arrays, and objects each have distinct visual styling. This makes it easy to spot type mismatches or unexpected null values at a glance.
Can I search within a large JSON document using the viewer?
You can use the built-in search to find specific keys or values within the JSON tree. Matching nodes are highlighted and the tree auto-expands to reveal results, which is invaluable when navigating JSON files with hundreds of properties.
How does the viewer handle very large JSON files?
The viewer uses virtualized rendering to display only the visible portion of the tree, keeping memory usage low even for multi-megabyte JSON documents. Scrolling and expanding nodes remain smooth regardless of document size.
Can I view JSON from an API response directly?
Paste any JSON text — whether from a REST API response, a curl command output, or a log file — and the viewer will instantly render it as a navigable tree. All processing happens locally in your browser.