Powerful JSON Tree tool for app and web developers. Create testing JSON trees, use value transformers to generate / transform JSON values. Test in your app using embedded http server. Many advanced features such JSON Path, Smart Objects, Token Transformers, API Requests, Token values and many more all free.

===== Import / Export =====
Start new JSON Model / Array
Import from JSON file
Import from Pasteboard
Import from iCloud
Export to .json file, or private iCloud library

===== Smart Objects =====
Create smart objects (Classes)
Smart objects maintains its key/order/rename structure
Suits for associative Arrays
SmartArrays uses value transformer to generate values

===== Value Transformers =====
Code yours value transformers using embedded editor
Use many included value transformers together with SmartObjects.
JSON Path Relative / Absolute transformers for API Responses

===== JSON Path =====
Use relative or absolute JSON Path
Select JSON Nodes in UI using JSON Path
Press space to reveal JSON Path hints

===== HTTP Requests =====
API Groups & Endpoints in tree structures
API Groups provide shared headers, variables, parameters for all child endpoints
API Endpoints as Requests
Tree hierarchy for value overrides.

===== Token Transformers =====
Compose dynamic values in API headers, URLs, Parameters
JSON Path token transformers to extract dynamic values from API Responses
Many useful transformers and value generators included

===== Search / Filter =====
Search within Keys & Values
Filter into selected JSON node or relative path

===== iCloud Library =====
Private & Public iCloud Library
Store your most used Project Nodes in your Private Library
Organize your library using folders
Share with user using Share in Public Library feature

===== Local Connection =====
Application acts as Http server
Stream JSON to your Browser, iOS or Mac application during development
Local Server ID for json nodes, fetch as http requests such http://localhost:8080/jsonid

===== Quick Look =====
Preview web page URLs from JSON values in popover
Preview image URLs from JSON values in popover

===== Edit =====
Edit JSON nodes tree
Cut, Copy Paste, Delete Duplicate (N) times JSON nodes.
Drag And Drop between documents, and text files
Reorder support

===== OSX =====
Versions support

What's New

Version 1.4.5

Amazing Dark UI support on macOS Mojave, Token Transformers & JSON Text view
===== API Token Value Transformers =====
Use dynamic values and JSON Paths within API variables, headers or any parameters.
Chain Token Transformers to create truly dynamic values and expressions.
Use JSON Path & selection transformers to quickly select understandable values for ID and similar.

===== API Quick Edit Panel =====
Toggle on on any parameter to have quick access of configurations for every API Group or API Endpoint
Preferences toggle added to auto expand to None / First level / Fully Expanded state JSON responses.

===== API Web & Text Views =====
Added simple web views to help with OAuth Authorizations and similar.
When non JSON convertible response is found, text view / web view will be presented and response nodes created.

===== Additional ======
JSON Text Preview appended
Autoexpand JSON trees for API Responses General Setting option added
Bug fixes

Ratings and Reviews

4.0 out of 5
8 Ratings
8 Ratings

Instantly annoying

It launched like twice before starting in with the tired old "pay me or wait to open a simple text file" business. Seriously, maybe demonstrate that this thing has any value before sticking your hand out. Deleted.

Developer Response

Hello, the application offers all functionality without save restrictions to all users. The pro version additionally adds access to private iCloud library. There is a remainder to purchase that will appear approx every 30 minutes for 5 seconds. Regarding your feedback I am adding remainder free period for 2 weeks after installing new version starting new update 1.4.4. If you like the application advanced features you are welcome to purchase Pro version and remove this small remainder.


Really great JSON editor

Crashes fixed! This is one of the best, if not the best JSON editors available.


Actually handles 100MB+ files

I am working with a message bus that has a lot of small messages and a number of very large ones. Standard text based editors and many node based editors don't handle them well. Parsing and searching are painful and crash the apps.

Smart JSON Editor however has been able to handle them which has been extremely helpful. I haven't tried transforms, I haven't tried smart objects, so I can't speak to those. I have used JSONPath though more complex queries with regex aren't yet workng but I can't tell why. This is a first version, helped me get my work done, so I'm happy. I'll be sending feature requests to the developer ad looking forward to updates.


Jan Kubny Kubna
19.3 MB
Developer Tools
macOS 10.12 or later, 64-bit processor
Age Rating
You must be at least 17 years old to download this app.
Unrestricted Web Access
© 2017 Jan Kubny Kubna


  • Family Sharing

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

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