J-Solver requires the plasma geometry and two input profiles: and . These profiles can be specified in several ways. Perhaps the most intuitive way is to represent these profiles as sets of sampling data points in flux coordinates. To ensure backward compatibility, J-Solver can also read the inequ file, where the geometry and profiles are parameterized. Alternatively, the IFUNC2=4 switch in inequ allows to interface the output profiles generated by the Tokamak Simulation code (TSC) with J-Solver.