A debug session identifier representing a debug session for the web application is stored in local storage. The web application is located in multi-node cloud storage. The local storage resides on a developer computer system that executes outside of the multi-node cloud system. A stateless debugger node and a stateless target tester node are selected from at least one node pool in the multi-node cloud system. The stateless debugger node and the stateless target tester node are separate from each other. An internal connection is provided between the stateless debugger node and the stateless target tester node within the multi-node cloud system based on the debug session identifier during the debug session. The script that is injected into the web application is debugged while the web application executes on the stateless target tester node.