Utility for Express.js < 5

express-async-handler.js

const asyncHandler = (fn) => (
  (req, res, next) => {
    Promise.resolve(fn(req, res, next))
      .catch(next)
  }
)

export default asyncHandler

express-async-handler.ts

import { 
  Request,
  RequestHandler, 
  Response,
  NextFunction,
} from 'express'

type AsyncRequestHandler = (...args: Parameters<RequestHandler>) => Promise<void>

const asyncHandler = (fn: AsyncRequestHandler) => (
  (request: Request, response: Response, next: NextFunction) => {
    Promise.resolve(fn(request, response, next))
      .catch(next)
  }
)

export default asyncHandler