JSON Stringify array

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4D v17.4

JSON


JSON Stringify array ( array {; *} ) -> Function result

Parameter	Type	Description
array	Text array, Real array, Boolean array, Pointer array, Object array	Array whose contents must be serialized
*	Operator	Pretty formatting
Function result	Text	String containing the serialized JSON array

Description

The JSON Stringify array command converts the 4D array array into a serialized JSON array. This command performs the opposite action of the JSON PARSE ARRAY command.

In array, pass a 4D array containing the data to be serialized. This array may be of the text, real, Boolean, pointer or object type.

Note: If you pass a scalar variable or field in array, the command will return a string with the parameter value between "[ ]".

You can pass the optional * parameter to use pretty formatting in the resulting string. This improves the presentation of JSON data by including formatting characters when it is displayed in a Web page.

Example 1

Conversion of a text array:

 C_TEXT($jsonString)

 ARRAY TEXT($ArrayFirstname;2)

 $ArrayFirstname{1}:="John"

 $ArrayFirstname{2}:="Jim"

 $jsonString :=JSON Stringify array($ArrayFirstname)

 

  // $jsonString = "["John","Jim"]"

Example 2

Conversion of a text array containing numbers:

 ARRAY TEXT($phoneNumbers;0)

 APPEND TO ARRAY($phoneNumbers ;"555-0100")

 APPEND TO ARRAY($phoneNumbers ;"555-0120")

 $string :=JSON Stringify array($phoneNumbers)

  // $string = "["555-0100","555-0120"]"

Example 3

Conversion of an object array:

 C_OBJECT($ref_john)

 C_OBJECT($ref_jim)

 ARRAY OBJECT($myArray;0)

 OB SET($ref_john;"name";"John";"age";35)

 OB SET($ref_jim;"name";"Jim";"age";40)

 APPEND TO ARRAY($myArray ;$ref_john)

 APPEND TO ARRAY($myArray ;$ref_jim)

 $JsonString :=JSON Stringify array($myArray)

  // $JsonString = "[{"name":"John","age":35},{"name":"Jim","age":40}]"

 

  // If you want to view the result in a Web page,

  // pass the optional * parameter:

 $JsonStringPretty :=JSON Stringify array($myArray;*)

Example 4

Conversion of a 4D selection in an object array:

 C_OBJECT($jsonObject)

 C_TEXT($jsonString)

 

 QUERY([Company];[Company]Company Name="a@")

 OB SET($jsonObject;"company name";->[Company]Company Name)

 OB SET($jsonObject;"city";->[Company]City)

 OB SET($jsonObject;"date";[Company]Date_input)

 OB SET($jsonObject;"time";[Company]Time_input)

 ARRAY OBJECT($arraySel;0)

 

 While(Not(End selection([Company])))

    $ref_value:=OB Copy($jsonObject;True)

  // If you do not copy them, the values will be empty strings

    APPEND TO ARRAY($arraySel;$ref_value)

  // Each element contains the selected values, for example:

  // $arraySel{1} = // {"company name":"APPLE","time":43200000,"city":

  // "Paris","date":"2012-08-02T00:00:00Z"}

    NEXT RECORD([Company])

 End while

 

 $jsonString:=JSON Stringify array($arraySel)

  // $jsonString = "[{"company name":"APPLE","time":43200000,"city":

  //"Paris","date":"2012-08-02T00:00:00Z"},{"company name":

  //"ALMANZA",...}]"