svrjs/src/middleware/redirectTrailingSlashes.js

const fs = require("fs");

module.exports = (req, res, logFacilities, config, next) => {
  // Trailing slash redirection
  if (
    !req.isProxy &&
    !config.disableTrailingSlashRedirects &&
    req.parsedURL.pathname[req.parsedURL.pathname.length - 1] != "/" &&
    req.originalParsedURL.pathname[req.originalParsedURL.pathname.length - 1] !=
      "/"
  ) {
    fs.stat("." + decodeURIComponent(req.parsedURL.pathname), (err, stats) => {
      if (err || !stats.isDirectory()) {
        try {
          next();
        } catch (err) {
          res.error(500, err);
        }
      } else {
        res.redirect(
          req.originalParsedURL.pathname +
            "/" +
            (req.parsedURL.search ? req.parsedURL.search : "") +
            (req.parsedURL.hash ? req.parsedURL.hash : "")
        );
      }
    });
  } else {
    next();
  }
};

module.exports.proxySafe = true;