JSON Viewer

Key takeaways

• Expandable tree with JSON paths
• Type labels on each node
• Client-side parsing only
• Pairs well with Formatter and Validator

What is a JSON tree viewer?

A tree viewer maps JSON values to nested nodes so you can expand objects and arrays instead of reading a flat string.

Paths such as $.user.tags[0] help you reference nested fields in tickets and code. Large documents remain client-side; extremely huge trees may feel slower because rendering happens in the tab.

Features

• Expandable tree

  Open and close objects and arrays to focus on the branches you care about.

• Path labels

  Each node shows a JSONPath-style reference for quick communication.

• Type cues

  Strings, numbers, booleans, and nulls are easy to distinguish at a glance.

• Pretty output

  Keep a formatted document panel ready to copy or download.

How it works

1. 1

   Paste JSON

   Provide JSON in the input editor or upload a file.

2. 2

   Explore the tree

   Expand and collapse nodes to inspect nested values and paths.

3. 3

   Copy formatted output

   Use the pretty-printed output panel when you need the full document.

Example walkthroughs

• User profile

  Nested user data becomes a navigable tree with paths for each property.

  {"user":{"id":42,"name":"Ada","tags":["admin","beta"],"meta":{"active":true}}}

• Mixed array

  Mixed-type arrays show index paths and per-item types clearly.

  [1,"two",{"three":3},null,true]

Use cases

• Explore unfamiliar APIs

  Open a large response and drill into only the branches you need.

• Explain structure to teammates

  Share node paths when discussing schema changes or bugs.

• Audit nested configs

  Review deep settings objects without losing context.

Code snippets

• Walk a path in JS

  js

  Use JSON Viewer paths to locate nested fields quickly.

  const value = data?.user?.tags?.[0];
  // Tree view shows the same path as $.user.tags[0]

Common errors

• Tree stays empty

  Cause: Input is not valid JSON, so parsing fails before the tree builds.

  Fix: Fix parse errors (or use JSON Validator) then reopen the viewer.

• Huge arrays feel sluggish

  Cause: Very large trees expand many DOM nodes in the browser.

  Fix: Collapse branches you do not need, or inspect a smaller sample.

About JSON Viewer

JSON Viewer turns raw JSON into an interactive tree so you can expand nested objects, scan types, and follow paths like $.user.tags[0]. It shines when a pretty-printed wall of text is too dense and you need to navigate structure visually instead of scrolling endlessly.

Each node shows its JSON type so you can spot strings that should be numbers, unexpected nulls, or arrays that grew deeper than the API docs promised. Paths help you quote exact fields in tickets, GraphQL notes, or support replies without guessing nesting.

The tree is built entirely in your browser after a local parse. Large documents stay on-device; extremely huge payloads may feel slower because rendering happens in the tab, which is the trade-off for privacy and offline use.

Best practice: validate or format first if the input might be invalid. Use Viewer for exploration, Formatter for copyable pretty output, and Compare or Diff when you need change reports. Collapse branches you do not need so deep trees remain manageable.

Frequently asked questions

Explore more

• All developer tools

  Browse formatters, converters, encoders, and more.

• JSON tools category

  Format, validate, view, compare, diff, and escape JSON.

• Privacy

  How client-side tools handle your data.