wrapping expressjs middleware

wrap_middleware.js

// SOURCE: https://stackoverflow.com/questions/47572752/calling-a-middleware-from-within-a-middleware-in-nodejs-expressjs

const wrappingMiddleware = (req, res, next) => {
  try { 
    if (process.env.SOME_VAR === 'true') {
        let externalMiddleware = logger({
          custom:true
        });
        return externalMiddleware(req,res,next); 
    } else {
        return next();  
    }
  } catch (err) {
    next(err);
  }
};

module.exports = wrappingMiddleware;