There's a picture and info on exactly how to wire to an nRF52DK here: https://www.espruino.com/Bangle.js2+Technical#swd
@Gordon started
Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
There's a picture and info on exactly how to wire to an nRF52DK here: https://www.espruino.com/Bangle.js2+Technical#swd