Sparkfun QWIIC JST connector part number?
As brhans said, the QWIIC connector is compatible with the SM04B-SRSS-TB from JST, but Sparkfun has a special deal with them, so they can get them in black colour.
For compatible use you can use this:

Horizontal header SMT SM04B-SRSS-TB



Vertical header SMT SM04B-SRSS-TB



Male connector to wire (SHR-04V-S-B)



Socket contact 28-32 AWG (SSH-003T-P0.2H)


The pinout is (pin 1 is on the left)

GND
3V3
SDA
SCL

That said even at Sparkfun you find white connectors :