JSON Viewer
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A large JSON document is hard to understand as text, however neatly it is indented — by the time a response runs to a few thousand lines, scrolling is not exploration. This JSON viewer renders the document as a collapsible tree instead, so you start with the top-level shape and open only the branches you care about. Arrays show their length, objects show their keys, and every node can be folded away, which turns a wall of text into something you can actually navigate. It is the quickest way to answer questions like "what fields does this endpoint return", "how deep does this nesting go", or "is this array empty or missing entirely". Paste a payload from your network tab or an exported file and start expanding. The document is parsed and rendered locally in your browser, so nothing is uploaded and viewing a response full of personal data is safe.
Features
- Collapsible tree view of any JSON document
- Expand and collapse individual branches or the whole tree
- Shows array lengths and object key counts at a glance
- Handles deeply nested and very large documents
- Validates the input and reports parse errors with position
- Switch between tree view and formatted raw text
- No installation, extension, or account required
- Runs fully client-side — your JSON stays on your machine
Why use this json viewer?
- Makes the shape of a large response obvious immediately
- Removes endless scrolling through indented text
- Keeps sensitive payloads private with local processing
- Works on any device with a browser, no setup needed
- Free with no limit on document size or view count
Frequently asked questions
How do I view a JSON file without downloading software?
Paste the contents into this viewer and it renders immediately as a collapsible tree. Nothing is installed and nothing is uploaded — the parsing happens in your browser.
Can I view very large JSON files?
Yes. The tree renders branches on demand, so you can open a large document and expand only the parts you need rather than rendering everything at once.
What is the difference between a JSON viewer and a formatter?
A formatter reindents the text so it is readable top to bottom. A viewer turns the document into an interactive tree you can fold and expand, which suits exploration rather than reading.
Why does my file show an error instead of a tree?
The document is not valid JSON, so it cannot be parsed into a tree. The viewer reports where parsing failed — usually a trailing comma, a single quote, or an unquoted key.
Is my JSON sent to a server?
No. Everything is parsed and rendered client-side in your browser. Your data is never transmitted, stored, or logged.
Can I edit values in the viewer?
This tool is read-only and optimised for exploring. Use the JSON Editor if you need to change values, or the JSON Path Tester to query specific fields.