It looks like a surface-mount resistor, in an “0402” or “0201” package. It’s hard for me to be certain of the package without measuring, but if you have access to a set of calipers you could check the package size yourself. Take a look at this chart and compare to the “imperial” sizes. I would recommend using a multimeter to measure the resistance across the two terminals on your working Joy-Con, and then once you have an estimate of the resistance value, looking on a site like DigiKey for a suitable replacement. A small disclaimer here: the resistance measurement that you take across a resistor when it’s installed in the circuit may not be completely accurate because other components in the circuit can affect the measurement. For something like this, it’s probably a safe assumption that the measurement will put you in the right ballpark.
However, it’s possible (and actually very common) for these resistors to be “jumpers” measuring zero ohms. If that’s the case here, you could simply place a blob of solder on the broken Joy-Con that bridges the two “pads” of the missing component.
Hope this helps,
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