This paper explores the role of thermal radiation, viscous dissipation and chemical reaction on stagnation point flow of Williamson nanofluid over an exponentially stretching sheet. The similarity transformations are performed to extract ordinary differential equations (ODEs) via partial differential equations (PDEs) and the simulation was accomplished by employing homotopy analysis method (HAM). In addition, we evaluated by comparing our findings to those previously described for specific occurrences which are in perfect unison. Skin friction, Nusselt number and Sherwood numbers are captured in the form of graphs and tables for distinct quantities of the flow parameters. The skin friction coefficient improves as the Williamson fluid parameter is elevated.