The real NestJS 12 runs in this page, on a Node.js runtime with Express, Socket.IO, an in-memory MongoDB and SQLite for TypeORM. Run (Ctrl/⌘+Enter) starts src/main.ts; send requests from the API tab below; Test runs the *.spec.ts files with Vitest. Not in the browser: database servers (PostgreSQL, MySQL, Redis), real files, the Nest CLI itself.
src/main.ts
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