Customize JSON Encoding for MATLAB Classes - MATLAB & Simulink (original) (raw)

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This example shows how to customize the jsonencode function for a user-defined MATLAB® class.

This class Person.m has a public property Name and a private property Age. If you calljsonencode to encode the data, the function only converts the public property.

classdef Person properties Name; end properties (Access = private) Age; end methods function obj = Person(name,age) obj.Name = name; obj.Age = age; end end end

1. Display a JSON-encoded instance of Person.
   obj = Person('Luke',19);
   jsonencode(obj)
2. To display the private property Age, customizejsonencode and add it to the methods block of class Person:
   classdef Person
   properties
   Name;
   end
   properties (Access = private)
   Age;
   end
   methods
   function obj = Person(name,age)
   obj.Name = name;
   obj.Age = age;
   end
   end
   function json = jsonencode(obj, varargin)
   s = struct("Name", obj.Name, "Age", obj.Age);
   json = jsonencode(s, varargin{:});
   end
   end
   The signature of the function must match the jsonencode signature, which takes a class object as input and returns a string or a character vector in JSON format.
3. Display the customized object.
   obj = Person('Luke',19);
   jsonencode(obj)
   ans =
   '{"Name":"Luke","Age":19}'

See Also

jsonencode