Strict JSON only. Beautify or minify on the JSON formatter; this page is the treeview.
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JSON tree viewer
View treeview JSON as a collapsible tree—expand nodes, see types, copy a branch. Local-first. No signup.
What is a JSON tree viewer?
JSON treeview features
Collapsible nodes
Open or close objects and arrays, or expand and collapse the whole tree.
Types and counts
Each node shows object, array, string, number, boolean, or null, plus sizes.
Copy a branch
Click a node to copy that subtree as JSON.
Live parse
The tree updates as you edit. Invalid JSON shows the syntax error.
How to use the JSON tree viewer
Paste JSON
Drop an object or array into the input. It can be minified or pretty-printed.
Explore branches
Expand nodes to read nested keys. Collapse sections you do not need.
Copy what you need
Click a node to copy that value, then paste it into code or another tool.
Tips for JSON treeview
- 01
Start collapsed on large files
Use Collapse all, then open only the branch you are debugging.
- 02
Format first if it fails
A parse error usually means a trailing comma or single quotes. Fix it in the JSON formatter.
- 03
Arrays use indexes
Array items are numbered. Objects show their keys.
- 04
Copy is the whole node
Clicking an object copies that object, not only the key name.
Great for
API payloads
Scan nested response bodies without a wall of text.
Config files
Jump to one setting inside a large object.
Debugging
Check types and array lengths before writing a parser.
Why view JSON here
Local-first
Documents never leave the browser for this tool.
Free
Unlimited viewing with no signup.
Separate from formatting
A tree for exploration; the formatter stays focused on beautify and minify.
Branch copy
Lift one node out without selecting text by hand.
Technical notes
- Parser
- JSON.parse — strict JSON only.
- Default depth
- The first two levels start open. Deeper nodes start collapsed until you expand them.
- Copy
- JSON.stringify(value, null, 2) for the clicked node.
- Privacy
- Client-side only—no network upload.
Sources & References
“The JSON.parse() static method parses a JSON string, constructing the JavaScript value or object described by the string.”
MDN — JSON.parse(): Parser that builds the value this treeview renders. developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/JSON/parse
“The JSON.stringify() static method converts a JavaScript value to a JSON string.”
MDN — JSON.stringify(): Used when you copy a node back out as JSON text. developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/JSON/stringify
“JSON is a text syntax that facilitates structured data interchange between all programming languages.”
ECMA-404 — The JSON Data Interchange Format: The JSON text syntax this viewer accepts. ecma-international.org/publications-and-standards/standards/ecma-404/