Developer Builds Full-Stack AI Prompt Manager Using Java 21, Spring Boot and React 19

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A developer has built an open-source full-stack application called AI Prompt Lab to help users manage reusable AI prompts in a structured, organised workspace instead of scattered notes or chat histories. The app combines Java 21, Spring Boot, React 19, TypeScript, PostgreSQL, and OpenRouter in a monolithic architecture covering authentication, authorisation, persistence, and external API integration. Each user gets an independent prompt collection and can link an OpenRouter account to interact with various language models directly within the platform. The backend follows a layered Spring Boot structure with role-based access control, BCrypt password hashing, and HTTP-only cookie-based session management. The project was intentionally kept simple and conventional, prioritising maintainability and clarity over complex architectural patterns.

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