Start modeling - finally!
your JSON visualization & design tool

If you are new to the app: this app is out for a couple of years now and develpers greatly appreciate it. It is a design tool primarily, and has always been for free as my part of giving back to the developer community. I put some effort in a smoother design and made many adjustments from some valuable feedbacks. Code generators are a separate feature, which is connected to a payment, which is a practical way to show if you value the feature and the app itself. Depending on your feedback the app will be extended with further functionality. Enjoy JSON modeling!

tl;dr: Modeling is the core feature and for free as always, code generators have to be paid for (and save lots of time)

Despite the long existence of UML and best practices of software engineering you can't find any diagrams in the API documentations of Google, Facebook, Twitter and the likes.

So help yourself, stop deciphering unreadable example files and use this new simplified visual representation of JSON structures as object oriented models.

• Tree structures depict hierarchical structures of objects
• Multiplicity indicator of objects and attributes depict arrays

Examples and a tutorial are provided inside the App. Use JSON Designer to jump right into defining your API, without reading a single page of JSON documentation.

• Graphically model JMs, ie your JSON Models
• Export JM images to integrate in documentations
• Reverse-generate JMs from URLs or direct JSON input
• Browse hand-picked API examples
• NEW Generate Protocol Buffers .proto for gRPC
• Tutorial
• Open-in: exchange JSON files with other apps

Stay tuned for new features via @jsondesigner on Twitter.
Feedback is gratefully appreciated.

More that 65% of JSON Designer users say it's a must-have and are using it daily!

Optional code generators for backers (saving you lots of time): Obj-C, Swift, Java, Kotlin, JavaScript, Perl, Python, Ruby, PHP.

To back the app, show your gratitude and support further development,
simply get the "I'm backing you" app subscription for a couple of month:

This subscription brings you access to an extended and growing selection of code generators. It's a recurring monthly subscription, bringing you full access to all code generators for that time. The subscription is allocated as monthly 1.99$ payment. The subscription automatically renews unless auto-renew is turned off at least 24-hours before the end of the current period. Your account will be charged for renewal within 24-hours prior to the end of the current period, and identify the cost of the renewal. The subscription may be managed and auto-renewal may be turned off by going to your Account Settings after purchase. No cancellation of the current subscription is allowed during active subscription period. Any unused portion of a free trial period, if offered, will be forfeited when you purchase the subscription. In regards of subscriptions please review the terms of use and privacy policy on

What’s New

Version 4.4.3

Improved OpenAPI import when type: object ist omitted,
plus alphabetical ordering.

Ratings and Reviews

3.5 out of 5
2 Ratings

2 Ratings

jasperdunn93 ,

Lots of bugs

Crashes all the time, otherwise it’s a brilliant idea.

joycepg ,

Works well

A nice app for graphically representing JSON. Since there isn't really a standard notation, you need to get used to this one, but its fine. The tutorial worked well, stepping me through the features with some exercises. I got stuck on the last one for a few moments, and there isn't a "give me hint" option or any help I could see, but I worked it out anyway and completed the tutorial. I like the way the app can create a diagram from a URL.

Jeremy Elgin ,

Can't use tutorial!

From an initial look it seems ok, but I've not been able to use the tutorial, the very first thing the app does and I want to follow to learn how to use this - it says it can't load my current progress (from Game Centre - why on earth a productivity tool uses GC I don't know) with a modal alert which cancels the tutorial, then creates another 'Tutorial' file every time I start the tutorial, which fails, again.

App Privacy

The developer, Cribster, has not provided details about its privacy practices and handling of data to Apple. For more information, see the developer's privacy policy.

No Details Provided

The developer will be required to provide privacy details when they submit their next app update.


  • Family Sharing

    Up to six family members will be able to use this app with Family Sharing enabled.

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