PCB Manufacturer Design Rules for KiCAD
To use, Open KiCAD, go to PCB Layout Editor then select Board Setup. In the Board Setup dialog, press the import settings button and select the /jlcpcb_2_layer/jlcpcb_2_layer.pro file which has various settings for the minimums allowed by this manufacturer. Select "Design Rules" and "Text and Graphics Properties".
Please double check these numbers on the manufacturer's own website before sending a board to production.