Schibsted Middy error handler middleware

HTTP error handler middleware for the middy framework, the stylish Node.js middleware engine for AWS Lambda

Automatically handles any uncaught errors and creates a proper HTTP response for them (using the message and the status code provided by the error object). We recommend generating these HTTP errors with the npm module http-errors.

This middleware should be set as the last error handler unless you also want to register the http-reponse-serializer. If so, this middleware should come second-last and the http-response-serializer should come last.

This is an alternative to standard Middy error handler with the following differences:

• it always returns JSON object and not text
• it handles any uncaught error, not just the ones with statusCode and message

Install

To install this middleware you can use NPM:

npm install --save @schibsted/middy-error-handler

Options

• logger (defaults to console) - a logging function that is invoked with the current error as an argument. You can pass false if you don't want the logging to happen.
• level (defaults to error) - log level to use for the error log entry

Sample usage

const middy = require('@middy/core');
const errorHandler = require('@schibsted/middy-error-handler');

const handler = middy(() => {
  throw new createError.NotFound('File not found');
});

handler
  .use(errorHandler());

// when Lambda runs the handler...
handler({}, {}, (_, response) => {
  expect(response).toEqual({
    statusCode: 404,
    body: JSON.stringify({ statusCode: 404, message: 'File not found' }),
  })
})

Contributing

Everyone is very welcome to contribute to this repository. Feel free to raise issues or to submit Pull Requests.