Koa error handling middleware

error-handling.middleware.ts

import type { Next }          from 'koa'
import type { RouterContext } from '@koa/router'

export default async function errorHandling(context:RouterContext, next:Next) {
  try {
    await next()
  } catch(err:any) {
    context.type = 'application/json'
    context.status =
      err.status ||
      err.statusCode ||
      err.status_code ||
      (err.output && err.output.statusCode) ||
      (err.oauthError && err.oauthError.statusCode) ||
      500

    let details:{[k: string]: any} = {}
    if (err.details) {
      details = err.details
    } else {
      Object.entries(err).forEach(([key, value]) => {
        if (key === 'message') return
        details[key] = value
      })
    }

    const res:App.ErrorResponse = {
      status: context.status,
      message: err.message || '',
      statusMessage: `${context.status} ${context.message}`,
      details
    }

    context.app.emit('error', err)
    console.error(err)

    context.body = res
  }
}