An online TypeScript compiler is a web-based tool that allows you to write, compile, and even run TypeScript code directly in your browser without needing any local setup. It typically features a code editor with syntax highlighting, real-time error feedback, and the ability to see the JavaScript output generated from your TypeScript code. Many also offer options to share your code snippets easily. 1 These compilers are invaluable for quick testing, learning, and prototyping TypeScript functionalities. 1