Syntax
set aString = anObject.classToJSON()
set aString = anObject.classToJSON(options)
Semantics

The operation classToJSON() takes any object (anObject) and tries to map it to a JSON string aString. If this is not possible, an error is raised.
JSON types and xUML types are mapped as listed in chapter jsonToClass() Operation.

classToJSON() does not support cyclic structures. When a cyclic structure is detected during serializing the given object, an exception will be thrown.

Runtimes before 2023.1 Trying to serialize a cyclic structure leads to a service crash.

Builder 7.5.0 You can hide attributes from being serialized by applying stereotype <<E2EPrivate>>. Refer to Hiding Attributes From Interfaces for more information.

SubstitutablesanObjectAny object. 
aStringTarget JSON document as String.
options

The optional parameter is an object of type ComposerOptions.

Its attribute is:

AttributeTypeDescriptionAllowed Values
compactBooleanWhen compact is true, the JSON composer will generate compact JSON, otherwise it will generate pretty JSON. The default behavior of classToJson() (i.e. when called without options) is equivalent to compact=false.trueGenerate compact JSON.
falseGenerate pretty JSON (default).
keepNullsBooleanWhen keepNulls is true, attributes of anObject with NULL values will be rendered to the JSON object, otherwise they will be left out completely (see also chapter NULL Values). The default behavior of classToJson() (i.e. when called without options) is equivalent to keepNulls=false.trueRender NULL attributes to the JSON object.
falseLeave out NULL attributes (default).
writeTypeDiscriminatorBoolean

Runtime 2021.6 Use writeTypeDiscriminator to suppress the generation of xUML type properties ("e2e:type") to the generated JSON. If this option is true, the Runtime will write the original xUML type to the generated JSON in form of "e2e:type": "<name of the original xUML type>" if the type being serialized does not match the expected metadata. This is necessary if you want to convert the generated JSON back to an xUML class using jsonToClass().

Runtime versions before 2021.6 will ignore the value.

trueWrite xUML type discriminator (default).
falseDo not write xUML type discriminator.
Examples
set addressAsJSONDocument = myAddress.classToJSON();

Example File (Builder project Add-ons/JSON):

<your example path>\Add-ons\JSON\uml\userManager.xml

Related Pages: