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Hazuu Tools

JSON Viewer

Visualize your JSON data as an interactive, collapsible tree with color-coded data types.

JSON Input
Tree View
Tree view will appear here...
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About JSON Viewer

JSON Viewer is a free online tool that transforms raw JSON text into an interactive, collapsible tree. Each object and array becomes an expandable node with a toggle arrow, so you can drill into deeply nested structures without scrolling through walls of curly braces. Object keys are shown in purple, string values in green, numbers in blue, booleans in amber, and null values in gray — all at a glance, without writing a single line of code.

The tree view is most useful when you need to understand the shape of an API response, inspect a configuration file, or trace a value through multiple levels of nesting. Unlike a plain text editor, the tree collapses branches you do not care about and keeps the path you are exploring visible. You can paste JSON directly, load it from a .json file via the upload button, or use the built-in sample to try the tool immediately.

Every byte of your data is processed locally in your browser using the standard JavaScript JSON.parse API. Nothing is sent to a server, stored, or logged. There are no accounts, no rate limits, and no cost — making it safe to use with API tokens, database exports, and any other sensitive JSON you would not want leaving your machine.

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Key Features

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Interactive expand/collapse tree

Every object and array is a toggle-able node. Click the arrow to expand a branch or collapse it, so you can focus on the slice of data that matters without losing context.

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Color-coded data types

Strings appear in green, numbers in blue, booleans in amber, null in gray, and object keys in purple. Type information is visible without hovering or selecting — useful when scanning large responses quickly.

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Child-count badges

Arrays show their element count and objects show their key count next to the opening bracket, letting you gauge the size of a node before expanding it.

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File upload support

Load any .json or .txt file directly from your disk via the upload button. No need to open the file in a text editor first — drag it in and click View Tree.

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Instant parse error reporting

If your JSON is malformed, the tool shows the exact error message from the parser in a clear banner rather than silently displaying nothing.

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100% client-side and private

Parsing happens entirely in your browser. API keys, tokens, and personal data inside your JSON never leave your machine.

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How to Use

01

Paste Your JSON

Copy your JSON data and paste it into the input editor on the left.

02

View Tree

Click "View Tree" to parse and display your JSON as an interactive, collapsible tree.

03

Explore

Click the arrows to expand and collapse nodes. Data types are color-coded for easy identification.

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Example

Pasting a nested API response and clicking View Tree renders each object and array as a collapsible node with color-coded values.

JSON input
{
  "user": {
    "id": 42,
    "name": "Alice",
    "active": true,
    "tags": ["admin", "beta"],
    "address": null
  }
}
Tree view (structure)
{5}
  "user": {5}
    "id": 42
    "name": "Alice"
    "active": true
    "tags": [2]
      0: "admin"
      1: "beta"
    "address": null
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Common Use Cases

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    Inspecting REST API responses

    Paste the raw JSON body from a fetch call, Postman, or browser DevTools and navigate the tree to locate the exact field you need — without counting brackets or reading minified text.

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    Understanding unfamiliar API schemas

    When integrating a third-party API for the first time, the tree view reveals the overall shape of the response — which keys are objects, which are arrays, and how deeply things nest — faster than reading documentation alone.

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    Reviewing configuration files

    Large configuration files such as tsconfig.json, package.json, or cloud infrastructure manifests contain many nested sections. Collapsing unrelated branches keeps the section you are editing in focus.

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    Tracing values in database exports

    MongoDB, Firestore, and other document databases export records as JSON arrays. The tree view lets you open individual records and trace field values without importing data into another tool.

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    Onboarding new developers to a data model

    Share a representative JSON document and ask teammates to explore it in the viewer. The color coding and collapsible structure communicates the data model visually without requiring them to read a schema definition.

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Frequently Asked Questions

What is a JSON Viewer? expand_more
A JSON Viewer displays JSON data as a visual, interactive tree structure. Instead of reading raw text, you can expand and collapse objects and arrays, see data types at a glance through color coding, and navigate complex nested structures easily.
How are data types shown? expand_more
Strings are shown in green, numbers in blue, booleans in amber, null values in gray, and object keys in purple. Arrays show their element count and objects show their key count next to the opening bracket, so you can gauge the size of a node before you expand it.
Is my JSON data secure? expand_more
Yes. All parsing and rendering happens entirely in your browser using the built-in JavaScript JSON.parse API. Your data never leaves your machine and is not sent to any external server, making it safe to use with API tokens, credentials, and other sensitive content.
Can I upload a JSON file? expand_more
Yes. Click the upload button in the toolbar to load a .json or .txt file directly from your computer. The file contents are read locally by the browser — no upload to a server occurs.
How is the JSON Viewer different from the JSON Formatter? expand_more
The JSON Formatter outputs pretty-printed text with indentation — useful when you need a clean text copy to paste into a file or code review. The JSON Viewer renders the same data as an interactive tree you can expand and collapse, which is better when you need to navigate and explore the structure rather than copy it. If you need a readable text version, use the formatter; if you need to drill into nested nodes interactively, use the viewer.
How is this different from the JSON Validator? expand_more
The JSON Validator is focused on confirming that a document is syntactically valid and optionally checking it against a schema. The JSON Viewer assumes your JSON is roughly valid and focuses on displaying the structure visually. It does report parse errors, but its primary purpose is navigation, not validation.
Can I edit the JSON directly in the viewer? expand_more
The input panel accepts free-form text so you can make quick edits before clicking View Tree again. For full editing with undo history, key renaming, and structural changes, use the dedicated JSON Editor tool instead.
Is there a size limit on the JSON I can paste? expand_more
There is no hard limit imposed by the tool. Because everything runs locally, performance depends on your browser and device. Typical API responses and config files parse instantly; very large files (several megabytes) may take a moment.