chess-io/src/js/constants/ChessPieces.js

const ChessPieces = {
  // key: piece from FEN, value: piece from Smart Regular chess font
  // white pieces
  'K': 'F',
  'Q': 'E',
  'R': 'D',
  'B': 'C',
  'N': 'B',
  'P': 'A',
  // black pieces
  'k': 'f',
  'q': 'e',
  'r': 'd',
  'b': 'c',
  'n': 'b',
  'p': 'a',
  // empty square
  '-': undefined
};

export default ChessPieces;