>Fafa Dev Tools

JSON Viewer

View JSON as an interactive collapsible tree with color-coded types. Free online JSON viewer with expand/collapse nodes and type highlighting.

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Paste JSON in the left panel to view the tree

What is JSON Viewer?

A JSON viewer transforms raw JSON text into an interactive, collapsible tree structure. Each node displays its key, type, and value with color coding: strings in green, numbers in blue, booleans in purple, nulls in gray, objects in amber, and arrays in cyan. This makes it easy to explore large, deeply nested JSON responses from APIs.

How to Use

  1. Paste your JSON data into the input area on the left
  2. The interactive tree view appears on the right automatically
  3. Click on any node with children to expand or collapse it
  4. Different types are color-coded for quick visual scanning

Examples

API response viewer

Input{"status":"ok","data":{"users":[{"id":1,"name":"Alice"},{"id":2,"name":"Bob"}],"total":2}}
OutputCollapsible tree: root → data → users [2 items] → {id: 1, name: "Alice"} ...

Nested config viewer

Input{"server":{"host":"localhost","ports":[80,443]},"logging":{"level":"info","file":"/var/log/app.log"}}
OutputCollapsible tree: root → server → host: "localhost", ports: [80, 443]

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Frequently Asked Questions

Can I expand or collapse all nodes at once?

Currently, nodes expand and collapse individually by clicking on them. By default, the first two levels are expanded so you can see the top-level structure immediately.

What do the colors mean?

Green = string values, Blue = numbers, Purple = booleans (true/false), Gray = null, Amber = objects (expandable), Cyan = arrays (expandable). This color scheme helps you quickly identify value types in the tree.

Does it handle very large JSON files?

The viewer works well for JSON up to a few megabytes. Very large files (10MB+) may cause browser slowdowns since the entire tree is rendered in the DOM. For such cases, consider using a dedicated desktop JSON viewer.