Free JSON Tree Viewer Online
View JSON as a collapsible tree with color-coded types. Free online JSON tree viewer.
Key Features
Everything you need in one free tool
Completely free with no registration, and no hidden charges.
browser-side workflows is done locally in your browser. Your data stays private.
Instant results using browser-native APIs and optimized algorithms.
Key Takeaways
- JSON is parsed locally with your browser native parser, so the data you paste is processed on your device.
- The viewer renders your JSON as a color-coded, collapsible tree, labeling containers as Object with n keys and Array of n items so you can gauge structure and counts at a glance.
- If the text cannot be parsed, it shows an Invalid JSON message with the parser error position, helping you catch trailing commas, single quotes, unquoted keys, or comments that standard JSON does not allow.
- String values longer than 200 characters are truncated with an ellipsis to keep the tree readable, so copy the full value from your original source if you need the complete content.
How to View JSON as a Tree
Paste your JSON
Copy any JSON value - an object, an array, or a single string or number - into the input box. The text is parsed on your device with the browser native JSON parser, so the data you paste stays on your device and is not uploaded anywhere.
Click View Tree
The viewer parses the text and renders it as a color-coded tree. Keys, strings, numbers, booleans, and null each get their own color, and arrays and objects show their size as Array of n items and Object with n keys so you can gauge structure at a glance.
Expand and collapse nodes
Click the minus or plus toggle next to any array or object to collapse or reopen that branch. This lets you fold away large sections and drill into the nested data you care about. Use the Clear button to reset the input and viewer.
How Each JSON Type Is Shown
The viewer reads your parsed JSON and renders every value according to its type. The table below shows how each JSON data type appears in the tree so you know what to expect when exploring nested data.
| JSON type | Tree display | Interactive |
|---|---|---|
| Object | Shown as Object with n keys with a toggle, where n is the number of keys | Collapsible |
| Array | Shown as Array of n items with a toggle, where n is the item count; items are indexed | Collapsible |
| String | Quoted text in the string color; values over 200 characters are truncated with an ellipsis | No toggle |
| Number | Rendered in the number color as written | No toggle |
| Boolean | Shown as true or false in the boolean color | No toggle |
| Null | Shown as null in the null color | No toggle |
When This Tool Helps
Inspecting API responses
Paste a raw API payload to see its shape clearly. Object with n keys and Array of n items labels reveal counts and nesting without scrolling through minified text.
Navigating deep structures
Collapse branches you do not need and expand only the path to the field you want. Handy for large configuration files and nested response bodies.
Spotting malformed JSON
If the text cannot be parsed, the viewer shows an Invalid JSON message with the parser error so you can locate the problem before using the data elsewhere.
Working with sensitive data
Because parsing happens in your browser and nothing is uploaded, the input stays on your device. Still avoid pasting live secrets or tokens you would not want on screen.
Common Problems and Fixes
It says Invalid JSON
The text could not be parsed. Common causes are trailing commas, single quotes instead of double quotes, unquoted keys, or comments, none of which standard JSON allows. Read the error message for the position, fix the syntax, and click View Tree again.
A long string is cut off
String values longer than 200 characters are shortened with an ellipsis to keep the tree readable. The full value is still in your original text; copy it from your source if you need the complete content.
Nothing happens when I click View Tree
The viewer only renders when the input is not empty. Make sure you have pasted text into the box. If the input is blank, the tree area simply stays hidden.
The tree is too large to scan
Use the minus toggles to collapse top-level objects and arrays, then expand only the branch you need. This keeps very large or deeply nested documents manageable on screen.
About This Tool
Visualize JSON as a collapsible, color-coded tree structure for easy exploration of nested data. This free tool works entirely in your browser for maximum privacy and convenience.
Frequently Asked Questions
Is this tool completely free?
Yes. The tool is 100% free to use with no registration, no subscription and no usage limits.
You can use it as many times as you need for personal or commercial projects without any cost.
We believe developer and productivity tools should be accessible to everyone without paywalls.
Is my data secure?
Yes. Everything runs locally in your browser using JavaScript. No data is transmitted to our servers — your files never leave your device.
You can safely use this tool with sensitive or confidential information without privacy concerns.
We do not log or store any input you provide to this tool.
Does this work on mobile devices?
Yes. The tool is fully responsive and works in any modern mobile browser on iOS and Android.
The interface adapts to smaller screens while maintaining full functionality.
All buttons, inputs and outputs are accessible on touch devices.
What browsers are supported?
The tool works in all modern browsers including Google Chrome, Mozilla Firefox, Apple Safari and Microsoft Edge.
We recommend keeping your browser up to date to ensure the best experience and access to the latest browser APIs.
Internet Explorer is not supported.
Do I need to install any software?
No. The tool runs entirely in your web browser with no downloads, plugins or installations required.
This makes it accessible from any device without modifying your system.
Simply open the page and start using the tool immediately.
How accurate are the results?
The tool uses browser-native APIs and standard algorithms to deliver accurate results consistent with industry expectations.
Where applicable, we implement well-tested open standards such as the Web Crypto API for hash generation and the native JSON parser for JSON tools.
If you encounter any result that seems incorrect, please try clearing and re-entering your input.
Can I use this tool in commercial projects?
Yes. The tool is free for personal and commercial use with no attribution required.
You can use generated outputs such as passwords, UUIDs and text in any project without restrictions.
The tool itself may not be resold or redistributed but using its outputs is completely unrestricted.
Where can I get help if I have a problem?
For questions or issues you can reach us through our contact page.
We monitor feedback and release regular updates to improve accuracy and add features.
Community suggestions are welcome and have shaped many of the options available in our tools.
Sources and References
Format and tool details on this page are based on the official specifications and documentation below.
- RFC 8259: The JSON Data Interchange Format- IETF
- JSON- MDN Web Docs