TJsonPropStorage
TJsonPropStorage 
is a component to save and restore selected properties (either TForm or any control on it). It cooperates with the TForm.SessionProperties property and is available on the Misc tab of the Component Palette. Its operation is analogous to that of the TXMLPropStorage component with the only difference that the property values are stored in an JSON file (rather than an XML file).
See also
From the Free Pascal wiki, page "TJsonPropStorage", as it stood on 2023-11-11 after a change by Slawek, out of the wiki's dump of 2024-05-26. Copyright stays with the author who wrote it, according to the old wiki's Licensing page. If you have concerns about this material, message the admin.