Serialized data (PHP or JSON) could be presented in a structured format (there may be JavaScript libraries that will create a navigable structure of serialized data... But a quick Google search came up with little.)
I would say for serialized meta data values, present a link instead that shows the serialization format, i.e.
"JSON-Serialized Data"
or
"PHP-Serialized Data"
Which could show a popup for navigating the serialized data.
Serialized data (PHP or JSON) could be presented in a structured format (there may be JavaScript libraries that will create a navigable structure of serialized data... But a quick Google search came up with little.)
I would say for serialized meta data values, present a link instead that shows the serialization format, i.e.
"JSON-Serialized Data"
or
"PHP-Serialized Data"
Which could show a popup for navigating the serialized data.