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4D v14.3

JSON

JSON PARSE ARRAY


JSON PARSE ARRAY ( jsonString ; objArray )

Parameter	Type	Description
jsonString	String	JSON string to parse
objArray	Object array, Text array, Real array, Boolean array, Pointer array	Array containing result from parsing of JSON string

Description

The JSON PARSE ARRAY command parses the contents of a JSON-formatted string and puts the data extracted into the objArray array. This command deserializes the JSON data; it performs the opposite action of the JSON Stringify array array command.

In jsonString, pass the JSON-formatted string whose contents you want to parse. This string must be formatted correctly, otherwise a parsing error is generated.

In objArray, pass the object to receive the parsing results.

Example

In this example, data from fields of the records in a table are extracted and then placed in object arrays:

 C_OBJECT($ref)

 ARRAY OBJECT($sel;0)

 ARRAY OBJECT($sel2;0)

 C_TEXT(v_String)

 

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

 OB SET($ref;"city";->[Company]City)

 

 While(Not(End selection([Company])))

    $ref_company:=OB Copy($ref;True)

    APPEND TO ARRAY($sel;$ref_company)

  // $sel{1}={"name":"4D SAS","city":"Clichy"}

  // $sel{2}={"name":"MyComp","city":"Lyon"}

  // ...

    NEXT RECORD([Company])

 End while

 

 v_String:=JSON Stringify array($sel)

  // v_String= [{"name":"4D SAS","city":"Clichy"},{"name":"MyComp","city":"Lyon"}...]

 JSON PARSE ARRAY(v_String;$sel2)

  // $sel2{1}={"name":"4D SAS","city":"Clichy"}

  // $sel2{2}={"name":"MyComp","city":"Lyon"}

  //...