UtilityBaseDeveloper Tools
JSON Viewer
Explore JSON as a collapsible, color-coded tree — expand and collapse any node.
Updated July 10, 2026
How to use the json viewer
- 1Paste your JSON into the box.
- 2Browse the tree that appears below.
- 3Click any object or array to expand or collapse it.
- 4Read values color-coded by type.
Common uses
- Exploring a nested API response
- Reading a config or data file
- Checking the structure of JSON quickly
- Debugging where a value lives in the tree
Frequently asked questions
What's the difference between a JSON viewer and a formatter?
A formatter pretty-prints or minifies JSON as text. A viewer renders it as an interactive tree you can expand and collapse node by node, which is far easier for exploring deeply nested API responses. This tool is the tree viewer; the JSON formatter handles reformatting and minifying.
Is my JSON sent anywhere?
No. It's parsed entirely in your browser, so your data never leaves your device. That makes it safe for real API payloads, tokens, or config files you wouldn't paste into an unknown server-side tool.
What happens if my JSON is invalid?
The viewer shows a clear error message describing the problem instead of a tree. Fix the syntax — a common cause is a trailing comma or an unquoted key — and the tree appears as soon as the JSON is valid.
About this tool
The JSON viewer renders raw JSON as a collapsible tree so you can navigate nested data without hunting through brackets. Click any object or array to expand or collapse it, and values are color-coded by type. It's built for reading API responses and config files, where a flat pretty-print becomes unwieldy fast. Invalid JSON shows a clear error. Everything is parsed locally in your browser, so even sensitive payloads never leave your machine. To reformat, minify, or pinpoint a syntax error, pair it with the JSON formatter.
Like most tools on UtilityBase, the json viewer runs entirely in your browser — nothing you enter is uploaded or stored on a server. It's free to use with no account required. Browse more developer tools here.
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