// Program.cs using Syncfusion.Licensing; var builder = WebApplication.CreateBuilder(args); // Register Syncfusion license SyncfusionLicenseProvider.RegisterLicense("YOUR_ACTUAL_KEY_HERE"); var app = builder.Build(); Use code with caution. For React / Angular / Vue (Essential JS 2)
import 'package:syncfusion_flutter_core/core.dart'; void main() { // Register your license key SyncfusionLicenseProvider.registerLicense('YOUR_ACTUAL_KEY_HERE'); runApp(MyApp()); } Use code with caution. Step 3: Clearing the Cache (The "Invisible" Fix)
The "Syncfusion trial license key fix" is version-sensitive.
Syncfusion moved to a several years ago. Unlike older components that relied on MSI installers to validate your machine, modern Syncfusion libraries (ASP.NET Core, Blazor, Flutter, React, etc.) require a programmatic key registration within your code. The warning persists usually because: The license key is missing from your startup logic.
In your entry point file (usually App.js , main.ts , or index.js ), register the license: javascript
Does the key version match your NuGet package version exactly? Have you cleared your bin and obj folders?
The most common mistake is using an expired key or a key for the wrong version. Log in to your page. Select "Get License Key" from the dashboard.
Troubleshooting the Syncfusion "Trial License Key" Message: A Complete Fix Guide
