Express Async Error Handler

Table of Contents

About
Setup

• Middleware
• Wrapper
• Decorator

Installation

1npm i @kramerdev/express-async-error-handler

About

This package implements a async error handler.

When you have unhandled promises inside Express routes, if no handler is used, you're server will probably crash if they throw an error. In those cases, you can use this package.

Setup

Middleware

First you need to create a generic handler function with the following signature:

1  (error: Error, req: Request, res: Response, next: NextFunction) => any

Example:

1  const handleErrorFunction = (error, req, res) => {
2    res.status(500).send({error: error.message})
3  }

Then you need to setup the middleware, as follows:

1  app.use(AsyncErrorHandlerMiddleware(handleErrorFunction))

Wrapper

If you're not using classes for your routes, you can use as a wrapper function, example:

1  app.get("/", AsyncErrorHandler(
2    async (req, res) => {
3      res.send("OK")
4    }
5  ))

Decorator

If you're using classes for your routes, you can use as a decorator, example:

1class Controller {
2  
3  @AsyncErrorHandler()
4  async home(req, res) {
5    res.send("OK")
6  }
7
8}