How FastFlag Editor & JSON Import/Export works in ClientAppSettings.json
Built-in table and JSON modal for adding, searching, importing, and resetting custom FastFlags with syntax validation.
When you adjust **FastFlags → FastFlag Editor** inside Bloxstrap, the bootstrapper writes `ClientAppSettings.json` into `ClientSettings\ClientAppSettings.json` before `RobloxPlayerBeta.exe` initializes its renderer.
Recommended values and stability tips
- **Accepted values:** `Valid FFlag / DFInt / FString JSON keys`. Stick to the built-in GUI preset under Engine Settings unless you are testing a specific JSON override.
- **Resetting:** If a custom value causes visual artifacts or a startup crash, use Reset FastFlags to default.
- **Installer:** Download the latest Windows build of Bloxstrap from /download.
Frequently asked questions
What FastFlag does "FastFlag Editor & JSON Import/Export" control?
It manages `ClientAppSettings.json` inside `ClientAppSettings.json`, accessible directly via **FastFlags → FastFlag Editor**.
Will this setting reset when Roblox updates?
No. Bloxstrap rewrites `ClientAppSettings.json` into the new Roblox version folder on every launch.