JSON File Viewer Online – Open JSON Files

{
  "name": "VetaTool",
  "features": ["json", "timestamp", "base64"]
}

   {
  "name": "VetaTool",
  "features":   [
    "json",
    "timestamp",
    "base64"
  ]
}

JSON file viewing guide

How to open and view a JSON file

Choose Import above to open a local .json file in the browser. VetaTool reads the text, validates standard JSON syntax, and displays formatted output without sending the file to a server.

Steps

Choose Import and select a text-based .json file from your device.
Review the formatted output or any reported syntax error.
Switch to Tree view when you need to explore nested objects and arrays.
Copy or download the validated result when you are finished.

View JSON files without uploading

The selected file is read with browser file APIs and placed directly into the JSON workspace. File contents are not submitted to an upload endpoint or remote parsing service.

This local workflow is useful for API responses, exported settings, fixtures, logs, and configuration files that may contain private or environment-specific values.

Supported JSON file size and processing

VetaTool accepts text-based JSON files up to the 10 MB import limit. Files reported as application/json, compatible text types, or recognized text extensions can be opened.

Large inputs pause automatic recalculation and wait for you to start processing. This prevents the document from being parsed repeatedly while it is still loading or being edited.

Standard .json files and compatible text-based files are supported.
Invalid JSON shows an error reason and source location when available.
Excessively deep JSON is rejected before recursive rendering becomes unsafe.

Format, validate, or explore the opened file

Formatted view adds readable indentation after the file passes validation. You can also minify the same data, sort object keys, decode Unicode escapes, or inspect nested values through Tree view.

Opening a file does not modify the original copy on your device. Downloads are created only when you explicitly choose the download action.

JSON file viewing example

A compact local file is validated and displayed with readable indentation while preserving its values and array order.

payload.json

{"project":"VetaTool","items":[1,2],"active":true}

Formatted file contents

{
  "project": "VetaTool",
  "items": [
    1,
    2
  ],
  "active": true
}

Common questions

Frequently asked questions

Does the JSON file viewer upload my file?

No. File reading, JSON validation, formatting, and tree inspection run locally in your browser.

What is the maximum JSON file size?

The current import limit is 10 MB. Large inputs pause automatic processing so you can choose when parsing begins.

Can the viewer open invalid JSON files?

It can read the file and show the source text, then reports the syntax reason, line, column, and nearby context when those details are available.

Does opening a file change the original file?

No. The browser reads a local copy into the workspace. The original file is not modified.