Question: Can you recommend a platform that allows me to test and run code directly in the browser?

If you want a platform to run code in your browser without installation hassles, RunCode is a good choice. This cloud-based development environment is fully customizable and supports a broad range of programming languages. It also has collaboration features like real-time workspace sharing and AI-assisted code completion, so it's good for full-stack developers and teams who need a collaborative and secure environment.

Another good option is AirCode, which focuses on Node.js and lets you write and deploy serverless functions in your browser. It has cloud sync, supports TypeScript, and has one-click publishing and API transformation. It's good for quick serverless function deployment, which is a good way to build and ship GPT-powered APIs.

For a broader range of programming languages and a more feature-rich environment, check out Replit. This platform lets you build, share and deploy software fast, with collaboration tools, AI code generation and secure source code management. Replit has several pricing tiers, including a free option, so it's good for different needs and budgets.

Last, Val Town is worth a look. It lets you write and run TypeScript code in your browser, combining serverless functions with social interaction. It's good for beginners and pros, with a free tier with limited resources and a Pro tier for bigger projects.