Wait, you're using the loop index as the key? This is React's default behaviour, and it's what it warns you about. Assuming you're looping over some kind of li

Wait, you're using the loop index as the key? This is React's default behaviour, and it's what it warns you about. Assuming you're looping over some kind of list of models, use the model's ID instead. Basically, no matter where in the array a value is, it should always have the same key.