allowedDecimalSeparators={[",", "."]} decimalSeparator='.' 1) paste '11.11', result '11.11'; 2) paste '11,11', result '1 111' decimalSeparator=',' 1) paste '11.11', result '1 111'; 2) paste '11,11', result '11,11' https://codesandbox.io/s/react-number-format-demo-f7245