The James Webb Space Telescope (JWST) is the largest international space project in history. Designed as the successor of the Hubble Space Telescope, it will provide the deepst and sharpest images of the universe at infrared wavelengths. I will illustrate the unique variety of observing modes offered by the four instruments onboard the observatory and their science capabilities, focusing on the large Guaranteed Time program aimed at discovering the first galaxies that re-ionized the Universe. Finally, I will briefly report on the current integration phase of JWST and the path forward leading to a May 2020 launch.