Create a Basic Framework with Express (Part 1.1)

In Part 1, error handling was created. Let's make it easier to throw errors. Instead of

let error = new Error('This is a major issue!!')
error.statusCode = 500
throw error

We will make it something like this

throw new ServerError({ message: 'This is a major issue!!' })

1. Create a new folder exceptions

2. Create ServerError.js in the exceptions folder

    class ServerError extends Error {
        constructor(resource) {
            super()
            this.name = this.constructor.name // good practice
            this.statusCode = 500
            this.message = resource ? resource.message : 'Server Error'
        }
    }
   
    module.exports = {
        ServerError
    }
   

3. Edit index.js, on how to use it

    // index.js
    ...
    const { ServerError } = require('./exceptions/ServerError')
   
    ...
    app.get('/error', async (req, res, next) => {
        try {
            throw new ServerError()
            // or
           // throw new ServerError({ message: 'A huge mistake happened!' })
        } catch (error) {
            return next(error)
        }
    })
    ...
   

4. Now go to localhost:3000/error to see the 500 server error