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JSONFree · Runs in browser

JSON Viewer

Explore JSON as an interactive tree with search and expand controls.

Quick answer

JSON Viewer on space4.dev is a free online json tool. Explore JSON as an interactive tree with search and expand controls. It runs entirely in your browser — no signup, no install, and your data is not uploaded to our servers.

Price
Free
Signup
Not required
Processing
100% in your browser
Data uploaded
No
Best for
json viewer, json tree view, json explorer

Features

  • Interactive collapsible tree view
  • Expand all and collapse all controls
  • Search across keys and values
  • Paste, upload, copy, and download JSON
  • Type-aware value rendering
  • Responsive layout for desktop and mobile
  • Runs fully offline in the browser

Examples

API response
{
  "status": "ok",
  "data": {
    "items": [
      { "id": 1, "name": "alpha" },
      { "id": 2, "name": "beta" }
    ]
  }
}
Mixed types
{
  "count": 3,
  "enabled": true,
  "note": null,
  "tags": ["dev", "tools"]
}

Frequently asked questions about JSON Viewer

Quick answers for privacy, pricing, and how this free online tool works.

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Guide

JSON Viewer — complete guide

JSON Viewer vs JSON Formatter

A formatter rewrites text. A JSON viewer turns that text into an interactive tree: expand objects, collapse arrays, and search for keys without scrolling through thousands of lines.

Use the space4.dev JSON Viewer when you need to understand nested API responses, GraphQL-like payloads, or large config trees quickly — still fully offline in your browser.

How to explore JSON as a tree

Typical workflow:

  • Paste or upload JSON into the viewer.
  • Expand nodes to drill into nested objects and arrays.
  • Use search to jump to matching keys or values.
  • Collapse branches you do not need so the tree stays readable.
  • Copy or download the original document when you are done inspecting.

Ideal use cases

Inspect webhook bodies, compare nested feature flags, review CMS export JSON, or teach teammates how hierarchical data is structured — without installing IDE plugins.