An interactive intermediate representation (IR) viewer displays a view of the intermediate representation of client side code during a just-in-time compilation of the client side code in a live environment. The interactive IR viewer allows a developer to request the intermediate representation generated during one or more of the phases of the JIT compilation of the client side code. Modifications may be made to the intermediate representation before executable code is generated. The analysis of the intermediate representation during the live environment provides a developer with insight as to how the executable code is being compiled so that improvements may be made to improve the performance of the client side code.