https://scriptyuvasi.com/writing/ Articles on Flutter, .NET, Node.js and shipping software. en https://scriptyuvasi.com/writing/understanding-app-features-without-source-code/https://scriptyuvasi.com/writing/understanding-app-features-without-source-code/Mon, 12 Oct 2026 00:00:00 GMTA short look at REA, an MCP server that gathers reverse engineering tools so an AI agent can explain how a feature of an app works. https://scriptyuvasi.com/writing/flutter-push-notifications-fcm/https://scriptyuvasi.com/writing/flutter-push-notifications-fcm/Wed, 26 Nov 2025 00:00:00 GMTHow to send token-based and topic-based push notifications from a Node.js backend to a Flutter app using Firebase Cloud Messaging. https://scriptyuvasi.com/writing/flutter-in-app-purchase-verification/https://scriptyuvasi.com/writing/flutter-in-app-purchase-verification/Sat, 16 Aug 2025 00:00:00 GMTHow to handle in_app_purchase in Flutter and verify iOS and Android purchases on a Node.js backend, with the product table, purchase stream and token refresh code. https://scriptyuvasi.com/writing/mysql-triggers-real-world-example/https://scriptyuvasi.com/writing/mysql-triggers-real-world-example/Wed, 10 Jul 2024 00:00:00 GMTFive MySQL triggers from an event management system that keep user events, details and default dates consistent, plus a note on their performance cost. https://scriptyuvasi.com/writing/node-middleware-authorization/https://scriptyuvasi.com/writing/node-middleware-authorization/Thu, 04 Jul 2024 00:00:00 GMTHow to handle authorization in a Node.js and Express API with JWT-checking middleware, including a user check and an admin role check on an endpoint. https://scriptyuvasi.com/writing/flutter-generic-response-request-handling/https://scriptyuvasi.com/writing/flutter-generic-response-request-handling/Tue, 02 Jul 2024 00:00:00 GMTA GenericResponse class for Flutter that wraps API results, with Dio, error handling, a ViewModel, UI code, tests, interceptors, caching and retries. https://scriptyuvasi.com/writing/flutter-pdf-generation-syncfusion/https://scriptyuvasi.com/writing/flutter-pdf-generation-syncfusion/Sun, 30 Jun 2024 00:00:00 GMTHow to create PDF files in Flutter with syncfusion_flutter_pdf, covering pages, page numbers, text, images, shapes, tables and lists, with a full example app. https://scriptyuvasi.com/writing/nodejs-redis-caching/https://scriptyuvasi.com/writing/nodejs-redis-caching/Sat, 15 Jun 2024 00:00:00 GMTSet up Redis, connect it to a Node.js app, and use it for caching with TTLs, manual invalidation and a few performance settings. https://scriptyuvasi.com/writing/flutter-jwt-authentication-wordpress/https://scriptyuvasi.com/writing/flutter-jwt-authentication-wordpress/Wed, 05 Jul 2023 00:00:00 GMTA Flutter app that logs in and registers users through the WordPress API, with JWT token creation and validation and secure token storage. https://scriptyuvasi.com/writing/generate-words-from-regular-expression/https://scriptyuvasi.com/writing/generate-words-from-regular-expression/Thu, 09 Feb 2023 00:00:00 GMTA university automata theory assignment solved in Java: build a DFA from a regular expression and use it to generate and check words, with no regex library. https://scriptyuvasi.com/writing/five-seo-tips-from-a-webmaster/https://scriptyuvasi.com/writing/five-seo-tips-from-a-webmaster/Sun, 27 Nov 2022 00:00:00 GMTFive SEO practices that bring visitors to a website, from choosing keywords to backlinks, based on about five years of running and selling sites. https://scriptyuvasi.com/writing/what-is-leetcode-competitive-programming/https://scriptyuvasi.com/writing/what-is-leetcode-competitive-programming/Mon, 21 Nov 2022 00:00:00 GMTWhat competitive programming is, which topics you need to start, how LeetCode fits in, and the advice I would give to someone just starting out.