Multiplayer debugging environment for Python, Node.js, Java, and C/C++

Replit has launched the first phase of a multiplayer debugging experience to help developers understand their code better. This update supports Python, Node.js, Java, and C/C++, offering the Replit native debugger that works instantly without any separate setup.

The existing printf() style debugging was cumbersome and carried the risk of introducing new bugs. With the new debugger, developers can pause the program (breakpoints) and check the state and variable values of a running program in real time.

This debugger was designed with Multiplayer at its core. All participants in a collaboration session share the following debugging session state:

• Breakpoints
• The currently executing line of code
• Local variable values
• Console output content

This sharing feature is extremely useful when getting help from a colleague to solve a complex problem, or when a teacher is guiding a student's code in an educational setting.

Technically, Replit leveraged the industry-standard Debug Adapter Protocol (DAP). This allows Replit to support various programming languages through a single abstraction layer, without having to build a new frontend for each language every time.