fix.js

const isValidSongContent = (req, res, next) => {
  const rules = [
    {
      name: "songTitle",
      validation: (value) => value.trim().length > 0,
      error: "Title content must be at least one character long.",
    },
    {
      name: "songArtist",
      validation: (value) => value.trim().length > 0,
      error: "Artist content must be at least one character long.",
    },
    {
      name: "trackId",
      validation: (value) => value.trim().length > 0,
      error: "trackId content must be at least one character long.",
    },
  ];

  rules.forEach(({ name, validation, error }) => {
    if (!validation(req.body[name])) {
      res.status(400).json({ error });
      return;
    }
  });

  next();
};