fix: GPO 'Configure favorites' only shows '[' instead of full JSON value

[dernerl]

Bug Description

When importing the generated JSON into a GPO policy setting ("Configure favorites"), the GPO editor only displays [ as the policy value instead of the full JSON array. The generated JSON file itself appears to be correct (as visible in a text editor), but the value is not properly stored/imported into the GPO.

Expected Behavior

The GPO policy setting "Configure favorites" should contain the full JSON array with all favorites entries (toplevel items and URLs).

Steps to Reproduce

1. Generate favorites JSON using ManagedFavsGenerator
2. Open Group Policy Management Editor
3. Navigate to the "Configure favorites" policy setting
4. Import / paste the generated JSON
5. Confirm and reopen the policy setting

Result: The policy value shows only [ instead of the complete JSON.

Environment

• Windows (GPO via Group Policy Management Editor)
• Generated JSON example:

[
  {
    "toplevel_name": "managedFavs"
  },
  {
    "name": "Citrix",
    "url": "https://citrix.com"
  },
  {
    "name": "Wiki",
    "url": "https://wikipedia.org"
  },
  {
    "name": "Copilot",
    "url": "https://m365.cloud.microsoft/chat"
  }
]

Logs or Error Messages

No explicit error message — the GPO editor silently truncates the value to [.

Additional Context

Screenshot shows the GPO editor displaying only [ as the value for "Configure favorites", while the Notepad in the background shows the complete and valid JSON content.

Possible causes:

• JSON value exceeds a character limit for GPO string policies
• Special characters or encoding issue causes early termination
• The JSON needs to be on a single line (minified) for GPO compatibility

[dernerl]

Root Cause & Fix

Confirmed: The bug is caused by newline characters in the JSON. GPO string values do not support multi-line input — the value gets truncated at the first line break, leaving only [.

Fix: Minify the JSON to a single line before pasting into the GPO editor.

Example:

[{"toplevel_name":"MyFavs"},{"name":"Example","url":"https://example.com"}]

This worked without issues in the GPO editor.

Suggestion: The ManagedFavsGenerator could offer a "Copy minified" button or export option to make this workflow easier.