# JSON Master: Editor & Viewer — JSON to CSV, XML, Excel Tool

> Offline JSON formatter, viewer, validator, and converter for developers. (iPhone/iPad app by 嵩 张.)

- Source: https://appshunter.io/ios/app/json-master-editor-and-viewer/id6757484875 (this page in markdown: same URL + `.md`)
- Developer: [嵩 张](https://appshunter.io/developer/1864792206)
- Category: Productivity, Developer Tools
- Price: Free with in-app purchases
- Rating: 4.60/5 from 5 App Store ratings · 3 written reviews indexed
- Age rating: 4+
- Requires: iOS 15.0 · 41 MB
- Languages: American English, French (France), German (Germany), Japanese, Korean, European Portuguese, Chinese (Simplified, China), European Spanish
- Released: 2026-01-12
- Data updated: 2026-08-13
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/json-master-editor-and-viewer/id6757484875/reviews.md

## What is JSON Master?

JSON Master is a professional JSON Formatter / Viewer / Converter for developers (offline iOS tool).
Three key points upfront: 100% offline processing, privacy-safe, large file support — your data is never uploaded to any server.

Core Features (Developer Favorites):

JSON Formatter & Beautifier: One-click format/beautify/minify, with syntax highlighting support.
JSON Viewer: Tree View / Text views for clear structure visualization.
JSON Validator: Instant syntax error detection (with line numbers) for quick API response debugging.
Fast Converter: Bidirectional JSON ↔ CSV / XML / Excel (.xlsx) conversion.
Large File Support: Smoothly open and edit large files.
Import Anywhere: Import from Clipboard / Files for debugging anytime.

Why Choose JSON Master?

• Privacy First: All formatting, validation, and conversion happen locally on your device.
• Focused & Distraction-Free: Clean interface with no redundant steps, perfect for quick data inspection and fixing.

Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Privacy Policy: https://legal.rkvpxdr.com/privacy.html

## Key features

- Offline JSON formatting and beautifying
- Tree and text view for JSON visualization
- Instant JSON syntax validation
- JSON to CSV, XML, Excel conversion
- Large file support
- Import from clipboard and files

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| JSON Master Pro (Weekly) | $2.99 | per 7 days |

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| JSON Master Pro Lifetime | $17.99 | one-time |


## Recent user reviews (3 of 3)

All indexed reviews: https://appshunter.io/ios/app/json-master-editor-and-viewer/id6757484875/reviews.md

### 5/5 — Minimalist and Powerful

*2026-02-10*

Love the minimalist design of JSON Master. The ability to switch between tree and code views is seamless. It’s very helpful for verifying data structures quickly. No unnecessary features, just a solid editor that feels native to iOS. If you’re looking for a reliable JSON tool for your iPhone, this is it.

### 5/5 — Finally a clean JSON viewer that works！

*2026-02-09*

I’ve tried several JSON tools on iOS, but most of them are either cluttered with ads or have a terrible UI. This one is surprisingly clean and intuitive. It makes reading nested structures so much easier on a smaller screen. The tree view is smooth and the overall performance is great even with larger files. Highly recommended for any dev on the go!

### 5/5 — Perfect companion for mobile debugging

*2026-02-07*

As a backend engineer, I often need to quickly check API responses when I'm away from my desk. This app handles complex JSON objects effortlessly. The editor is responsive, and the syntax highlighting is spot on. It has definitely improved my mobile workflow. Simple, fast, and does exactly what it promises. 5 stars!

## Frequently asked questions about JSON Master

### Does JSON Master have ads?

Yes, JSON Master contains advertisements. As a free application with in-app purchases, advertisements are displayed to support its development and maintenance.

### What is the pricing for JSON Master Pro?

JSON Master Pro is available via a weekly subscription at $1.99 per 7 days, which includes a 3-day free trial period.

### How often is JSON Master updated?

The app was last updated on February 18, 2026, indicating a recent update. The latest version is 2.0.1.

### What devices does JSON Master support?

JSON Master is compatible with iPhone, iPad, and iPod devices, running on iOS.

### Is JSON Master safe for sensitive data?

Yes, JSON Master emphasizes privacy by performing all formatting, validation, and conversion locally on the device, ensuring your data is never uploaded to any server.

### Can JSON Master handle large JSON files?

Yes, a key feature of JSON Master is its support for large files, allowing users to smoothly open and edit them.

### What are the main benefits of using JSON Master?

Users appreciate its 100% offline processing, privacy-safe local operations, and the ability to quickly format, view, validate, and convert JSON data with a clean, distraction-free interface.

### What is the age rating for JSON Master?

JSON Master has an age rating of 4+, making it suitable for a wide range of users.

## Version history (last 5 releases)

### 2.0.2 — 2026-08-13

Better, Faster, Stronger!

New Home Interface: Re-designed with you in mind—access your core tools with fewer taps.

Powerful Editing: We've fine-tuned the Editor and Calculator logic to handle your tasks more efficiently.

Polished Details: Updated UI feedback and toast notifications for a more responsive feel.

Reliability Update: Multiple internal enhancements to ensure JSON Master runs smoothly on all devices.

### 2.0.1 — 2026-02-18

Better, Faster, Stronger!

New Home Interface: Re-designed with you in mind—access your core tools with fewer taps.

Powerful Editing: We've fine-tuned the Editor and Calculator logic to handle your tasks more efficiently.

Polished Details: Updated UI feedback and toast notifications for a more responsive feel.

Reliability Update: Multiple internal enhancements to ensure JSON Master runs smoothly on all devices.

### 2.0.0 — 2026-02-03

Version 2.0.0: The Major Evolution

JSON Master 2.0 is here! We’ve rebuilt the experience from the ground up to make your development workflow faster, smoother, and more professional.

Streaming Conversion for Large Files: Our most significant technical upgrade yet. Using our new streaming engine, you can now convert massive JSON datasets to Excel, CSV, or XML without lag or memory issues.

Brand New UI/UX: A completely refactored interface with modern, high-performance components. Enjoy a cleaner Home screen and a more powerful Editor layout designed for productivity.

Smooth Onboarding: New to JSON Master? Our new interactive onboarding will get you up to speed with our core features in seconds.

JSON Master Pro: Introducing a new professional subscription. Unlock unlimited conversions, handle larger files, and enjoy a completely ad-free experience.

Global Support: Enhanced internationalization support for a truly localized experience across different regions.

Under-the-Hood Improvements: Optimized startup performance, smarter error handling, and refined ad delivery to ensure a stable and seamless workspace.

Streamline your development workflow today with the all-new JSON Master 2.0!

### 1.2.1 — 2026-01-22

- New Pro Conversions: Seamlessly convert JSON to Excel (.xlsx), CSV, and XML. Your data, your format.

- Refined UI: A brand-new, distraction-free editor and result page designed for developers.

- Speed Optimization: Optimized ad pre-loading for a lightning-fast experience.

- Unlock Pro: Upgrade to JSON Master Pro for unlimited conversions and an ad-free workspace.

### 1.2.0 — 2026-01-19

- New Pro Conversions: Seamlessly convert JSON to Excel (.xlsx), CSV, and XML. Your data, your format.

- Refined UI: A brand-new, distraction-free editor and result page designed for developers.

- Speed Optimization: Optimized ad pre-loading for a lightning-fast experience.

- Unlock Pro: Upgrade to JSON Master Pro for unlimited conversions and an ad-free workspace.

## More apps by 嵩 张

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All apps by 嵩 张: https://appshunter.io/developer/1864792206

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-13.*