JSON Viewer — Collapsible Tree Explorer
Turn a wall of nested JSON into a navigable tree. Expand and collapse branches to focus on the payload you care about, without editing the source.
Last updated: · Runs 100% in your browser
Result will appear here.// What is the JSON Viewer?
The JSON Viewer renders a document as an explorable tree instead of a wall of text. Objects and arrays collapse to a single line showing their type and child count, so you can close the parts you do not care about and drill into the branch you do. This is the fastest way to understand the shape of an unfamiliar payload — a third-party API response, a serialised database row, an analytics event — without scrolling through hundreds of lines. Values are colour-coded by type, which makes it immediately obvious when a number arrived as a quoted string or a field you expected to be an object is actually null. The whole tree is built in your browser from your pasted text.
// Features
- ▸Collapsible nested nodes
- ▸Type-aware coloring for strings, numbers, booleans and null
- ▸Array and object counts at a glance
- ▸Copy any subtree
// How to use
- 01Paste JSON into the input pane.
- 02Click any node in the output to expand or collapse it.
- 03Use the Copy button to grab the entire structure.
// Use cases
- ▸Exploring an unfamiliar third-party API response for the first time.
- ▸Locating one deeply nested field inside a large document.
- ▸Spotting type mistakes such as numbers serialised as strings.
- ▸Walking a colleague through a payload structure during review.
// FAQ
Your data never leaves your browser. This tool runs 100% locally — no upload, no logging, no analytics on your inputs.