JSON Viewer

Open a JSON file or paste JSON and explore it as a clean, collapsible tree — expand only the parts you care about, with types and item counts at a glance.

Drop a .json file here or click to choose

…or paste JSON

🔒 Your JSON is parsed in your browser — it is never uploaded.

🔒 Nothing you enter is sent anywhere or stored. All processing happens in your browser.

Features

Collapsible tree view

Every object and array becomes a branch you can expand or collapse, so you can focus on one part of a big JSON document at a time.

Open a file or paste

Drop in a .json file or paste text — either way it renders instantly as a navigable tree.

Types and counts

Strings, numbers, booleans and nulls are colour-coded, and each branch shows how many items it holds.

Clear error messages

If the JSON is malformed, the viewer tells you what's wrong instead of just failing silently.

Private, in your browser

Parsing happens on your device — API responses and configs with secrets are never uploaded.

How it works — in four simple steps

No signup, nothing to install — it all runs in your browser.

Step 01

Open or paste your JSON

Drop a .json file onto the box, or paste JSON into the text area.

Step 02

View the tree

Press View tree to render it as an expandable structure with types and counts.

Step 03

Expand and collapse

Click any branch to fold it, or use Expand all / Collapse all to move between levels.

Step 04

Inspect the values

Drill into the exact field you need; use the JSON Formatter if you'd rather pretty-print the raw text.

How it works

A JSON file is just structured text, but once it's more than a few lines — or all crammed onto one line — it's hard to read. A JSON viewer turns it into an interactive tree you can navigate: each object and array becomes a collapsible branch, so you can expand only the part you're interested in and fold away the rest.

Open a .json file or paste JSON, and the viewer parses it and renders the tree with syntax colours, item counts on each branch, and clear types for strings, numbers, booleans and nulls. Click any branch to collapse or expand it, or use Expand all / Collapse all to jump straight to the level you need. If the JSON is invalid, it tells you exactly what went wrong.

Everything is parsed in your browser, so API responses and config files with sensitive values never leave your device. To pretty-print or minify the raw text instead, use the JSON Formatter.

Examples

Paste a one-line API response and expand just the field you need to inspect.

Open a large config file and collapse everything, then drill into one section.

Frequently asked questions

How do I open a JSON file?

Drop the .json file onto the box above (or click to browse) and it opens instantly as a readable, collapsible tree. Because JSON is plain text you could also open it in any editor, but the tree view is far easier to navigate.

What's the difference from a JSON formatter?

A formatter pretty-prints or minifies the raw text; this viewer renders JSON as an interactive tree you can expand and collapse to explore its structure. Use whichever suits the task — both are here.

Can it handle large JSON files?

Yes — it renders the whole structure and lets you collapse branches so big documents stay manageable. Very large files depend on your device's memory, since everything runs locally.

Is my JSON uploaded anywhere?

No. It's parsed entirely in your browser, so sensitive API responses and config files never leave your device.

Why won't my JSON load?

It's probably not valid JSON — common causes are single quotes instead of double, trailing commas, or unquoted keys. The viewer shows the parse error so you can fix it, or use the JSON Formatter to validate.