http-server-request-handlers-error-logger

an http.Server request handler for express that handles IncomingMessage errors

table of contents

• notes
• installation
• api
• usage
  • basic
• license

notes

this middleware should be added after all “non-error” middleware in the application.

it expects the following:

• req is an object
• req.headers exists
• req.connection exists
• res is an object
• res.get is a function
• res.send is a function

it implements the following:

• creates an error object containing the following properties

{
  error: {
    body: req.body || null,
    code: err.code || null,
    date: new Date(),
    errorCode: err.errorCode || null,
    headers: req.headers || null,
    message: err.toString() || null,
    method: req.method || null,
    originalUrl: req.originalUrl || null,
    remoteAddress: req.headers[ 'x-forwarded-for' ] || req.headers[ 'x-real-ip' ] || req.connection.remoteAddress || null,
    session: req.session || null,
    status: err.status || null,
    statusCode: err.statusCode || 500
  }
}

• adds the error statusCode to res as res.statusCode
• logs the error object to console.error
• logs the err.stack to console.error if the error.statusCode is not equal to 404
• creates a message format based on the current request content-type and server environment
  • when the response content-type is application/json

    error: {
      code: err.code || null,
      errorCode: err.errorCode || null,
      message: err.toString(),
      status: err.status || null,
      statusCode: err.statusCode || 500
    }

  • when NODE_ENV is set to development and content-type is not application/json
    • the err.stack
  • otherwise the err.message

installation

npm install http-server-request-handlers-error-logger

api

/*
 * @param {Error} err
 * @param {number} err.status
 * @param {number} err.statusCode
 *
 * @param {IncomingMessage} req
 *
 * @param {ServerResponse} res
 * @param {Function} res.send
 *
 * @returns {undefined}
 */
function errorLogger( err, req, res )

use

var express = require( 'express' );
var app = express();
var errorLogger = require( 'http-server-request-handlers-error-logger' );

// ... middleware declarations
// ... route declarations

app.use( errorLogger );

license

MIT License