Start modeling - finally!
We all love our de-facto standard JSON.

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 new feature, which is connected to a payment, which is a practical way to show if you value the feature and the app. 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, new 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
• Email JM images to integrate in documentations
• Reverse-generate JMs from URLs or direct JSON input
• Browse hand-picked popular API examples
• 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, 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 4.1.4

Kotlin ?:
Now with Kotlin code generator in the subscription.
The app has been updated for iOS 12.

Ratings and Reviews

3.2 out of 5
5 Ratings
5 Ratings

Clunky but good

This is the only app on the app store that allows you to export your *.JSON files. I don't care that it is clunky and you can't use your own formatting, this works.


Very hard to use

I find the UI very difficult to pan, expand, and find nodes let alone edit. Keep it simple, and this is not.


Crashes when pasting in a URL for visualization

This app appears to have a feature where you can paste in a JSON URL and it will load the results into the molder. Great idea for a feature, only, it crashes every time I try to use it. Too bad because I could really use this kind of feature to analyze the JSON results coming from one of my clients interfaces. In spite of this, I still give the app 3 stars because it is useful for modeling JSON and this is the only problem I have with the app. Please, fix this bug!


Cribster UG (haftungsbeschrankt)
4.2 MB
Requires iOS 9.3 or later. Compatible with iPhone, iPad, and iPod touch.
Age Rating
Rated 4+
© 2012-2017 Cribster
In-App Purchases
  1. App Backer - Code Generators Access $1.99


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

More By This Developer

You May Also Like