Developer Builds 30 Browser-Based Dev Tools Using Blazor WebAssembly to Protect User Data

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A C# developer created SamToolkit, a collection of 30 developer utilities built with Blazor WebAssembly that process all data entirely within the user's browser. The project was motivated by a common but overlooked security risk: developers routinely paste sensitive data such as JWT tokens, API keys, and config files into unknown third-party websites. Because Blazor WebAssembly runs the .NET runtime client-side, no user input is ever transmitted to a server, making the privacy guarantee architectural rather than policy-based. The toolkit covers tools like JWT decoders, Base64 converters, JSON formatters, and diff checkers, all hosted as static files with no backend infrastructure. Key engineering challenges included optimizing first-load performance through code trimming and Brotli compression, and improving search engine visibility by assigning each tool its own dedicated URL route.

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