Search notes:

System.Text.Json (namespace)

Getting the library in versions prior to .NET Core 3.0

This link indicates that System.Text.Json is by default only available as part of the shared framework for .NET Core 3.0 and later versions.
Therefore, in earlier versions, System.Text.Json needs to be installed with NuGet (see this link).

See also

The .NET class System.Web.Script.Serialization.JavaScriptSerializer
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Fatal error: Uncaught PDOException: SQLSTATE[HY000]: General error: 8 attempt to write a readonly database in /home/httpd/vhosts/renenyffenegger.ch/php/web-request-database.php:78 Stack trace: #0 /home/httpd/vhosts/renenyffenegger.ch/php/web-request-database.php(78): PDOStatement->execute(Array) #1 /home/httpd/vhosts/renenyffenegger.ch/php/web-request-database.php(30): insert_webrequest_('/notes/Microsof...', 1758181014, '216.73.216.150', 'Mozilla/5.0 App...', NULL) #2 /home/httpd/vhosts/renenyffenegger.ch/httpsdocs/notes/Microsoft/dot-net/namespaces-classes/System/Text/Json/index(45): insert_webrequest() #3 {main} thrown in /home/httpd/vhosts/renenyffenegger.ch/php/web-request-database.php on line 78