100% Private & Secure

Free JSON Viewer
Format & Explore Data

Drop a .json file to view its structure in an interactive tree. Expand, collapse, search, and format — all processed locally with zero uploads.

Collapsible tree viewSyntax highlightingSearch & filterFormat & minify

Drop your .json file here

or click to browse

About

What Is a JSON File?

JSON (JavaScript Object Notation) is a lightweight, human-readable data format used to represent structured data. It consists of key-value pairs in objects and ordered lists in arrays. JSON is the most common format for web APIs, configuration files, and data interchange between systems.

Files use the .json extension and can range from a few bytes to hundreds of megabytes. Our free JSON Viewer parses these files in your browser and displays them as an interactive, collapsible tree — without uploading your data anywhere.

Use the viewer to explore API responses, inspect config files, verify data exports, or simply pretty-print minified JSON. With syntax highlighting, search, and format/minify toggling, it's a complete JSON toolkit that runs entirely in your browser.

Features

Features of the JSON Viewer

Explore and format JSON files with powerful tools

Collapsible Tree View

Navigate your JSON data as an interactive tree. Expand and collapse objects and arrays at any nesting level.

Syntax Highlighting

Strings, numbers, booleans, and null values are color-coded for instant readability and easier debugging.

Search & Filter

Type a keyword to highlight matching keys and values throughout the JSON tree in real time.

Format & Minify

Switch between pretty-printed and minified views. Copy either format to your clipboard in one click.

No Upload

JSON files are processed entirely on your device. Nothing is sent to any server.

Private & Secure

Your data never leaves your browser. Ideal for config files, API responses, and sensitive payloads.

How to use

How to View a JSON File Online

Four simple steps — no install, no sign-up

01
01

Open the JSON Viewer

Navigate to the JSON Viewer page and you'll see the file upload area.

02
02

Drop Your .json File

Drag and drop a .json file into the upload zone, or click to browse and select one.

03
03

Click View File

The tool validates and parses your JSON, then shows file size and structure summary.

04
04

Explore the Tree

Expand nodes, search for keys, switch between tree/formatted/minified views, and copy to clipboard.

Use cases

Use Cases for the JSON Viewer

When and why to open JSON files online

API Response Debugging

Paste or drop an API response to explore its structure and quickly find nested values.

Config File Inspection

Open package.json, tsconfig.json, or other config files to review settings in a clear tree.

Data Export Review

Verify JSON exports from databases, analytics tools, or CMS platforms before importing elsewhere.

Privacy-First Viewing

Inspect sensitive JSON payloads (tokens, credentials, PII) without uploading to third-party services.

Development & QA

Quickly validate JSON output from scripts, migrations, or build processes during development.

Format Conversion

Pretty-print minified JSON or minify large formatted files, then copy the result in one click.

Compare Plans

Free vs Paid — JSON Viewer

Get started free, upgrade when you need more power.

Feature
Free
Paid
Daily usage
5 uses/day
Unlimited
File size limit
10 MB
Up to 500 MB
All core features
No software installation
Works on any device
Files stay on your device
Batch processing
Priority support
Upgrade — starting at $6.99/mo
Upgrade to Full Version

Unlock the Full Power of JSON Viewer

Remove daily limits, process larger files up to 500 MB, enable batch processing, and get priority support.

Buy Full Version — $6.99/moor $300 enterprise

File Viewers includes:

  • 21 file viewers included
  • Unlimited daily uses
  • 100 MB file size limit
  • All file formats supported
  • Email analysis tools

Also available in the All Tools Bundle

FAQ

Frequently Asked Questions

Common questions about the JSON Viewer

Q1. What is a JSON file?
JSON (JavaScript Object Notation) is a lightweight, text-based data interchange format. It uses key-value pairs and ordered lists to represent structured data and is widely used in web APIs, configuration files, and data exports.
Q2. Do you upload my JSON file?
No. The JSON Viewer processes your file entirely in your browser. Your data is never sent to our servers or any third party.
Q3. Can I view very large JSON files?
Yes, though performance depends on your browser and device. The tree view renders nodes on demand as you expand them, so even files with thousands of keys should be navigable. For extremely large files (50 MB+), the formatted text view may be more responsive.
Q4. Does it validate JSON syntax?
Yes. If your file contains invalid JSON (trailing commas, unquoted keys, etc.), the viewer will show a clear error message instead of a tree. You can then fix the file and re-upload.
Q5. What does the search feature do?
The search box lets you type any text to highlight matching keys and values throughout the JSON tree in real time. Matching nodes and their paths are highlighted in yellow so you can quickly locate the data you need.
Q6. Can I copy the JSON?
Yes. Use the Copy button above the viewer to copy the current view (formatted or minified) to your clipboard. This is useful for quickly sharing or pasting cleaned-up JSON into another tool.
Q7. Does it work on mobile?
Yes. You can open the JSON Viewer on a phone or tablet, tap the upload area, and select a .json file from your device. The tree view is scrollable and touch-friendly.
Q8. Is the JSON Viewer free?
Yes. The tool is completely free to use with no sign-up, no limits, and no ads.
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