| 'JV' | JSON Version | 
Sets which version of the JSON constructor to use.
| JV | Version | Description | 
| 0 | JSON constructor Version 0 | Initial release. | 
| 1 | JSON constructor Version 1 | Enhanced JSON processing. | 
| 2 | JSON constructor Version 2 | Improved performance in the generation of large JSON strings. See Note. | 
(The 'JV' system parameter was added in PxPlus 2019.)
 (Support to change the default value from 'JV'=1 to the new version 'JV'=2 was added in PxPlus 2022.)
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