Simple wrapper for promise-based Express.js middlewares.

async-middleware-wrapper.js

/**
 * Simple wrapper for promise-based Express.js middlewares.
 * @param {function(req, res): Promise<void>} asyncHandler The promise-based middleware to wrap.
 * @returns {function(req, res, next)} A middleware that can be passed to Express.js.
 * @example
 * app.use('/', asyncWrapper(async (req, res) => { res.send('Hello!'); }))
 */
function asyncWrapper(asyncHandler) {
  return (req, res, next) => {
    (async () => {
      try {
        await asyncHandler(req, res);

        if (!res.finished) {
          next();
        }
      } catch (err) {
        next(err);
      }
    })();
  };
}