express-status-message-error

Simple custom Error prototype and Error handling middleware for REST APIS built on express framework.

Installation

npm install express-status-message-error

Usage

This module offers basically a custom error prototype and a error handler middleware to be used together the NodeJS express framework.

CustomError

This Error prototype can be thrown as a normal JS built-in Error, whereas it inherits its prototype chain.

Parameters :

• status: A http status code to be returned. By default, it assumes a 500 status code.
• message: A message text to be returned to the user. By default it assumes An error occured.
• opts: An Object to allow some kind of customization in a near future. By now, it's useless, we thought it'd be a good idea to place it here just for API-defining purposes, though. Feel free to implement something useful here. (:

Example:

const {CustomError} = require('express-status-message-error');
 
throw new CustomError(401, "User not found!");
 
// or
 
throw new CustomError(412, "Filter field must be defined");

errorHandler

A simple middleware to handle errors.

• Example of usage with an express app:

const {CustomError , errorHandler} = require('express-status-message-error');
 
app.get('/error', (req, res, next) => {
    return next(new CustomError(404, "You shouldn't hit this route"))
});
 
app.use(errorHandler)

It'll send back a json to the client:

HTTP/1.1 404 Not Found
{
    "error": {
        "title": "Not Found",
        "message": "You shouldn't hit this route"
    }
}

• Example of usage with an express route and a mongoose query using promises:

 
app.put('/user/:id/interests', (req, res, next) => {
  User.update({ _id: req.params.id }, { $pushAll: { interests: req.body }})
    .then((result) => {
      if (result.nModified === 1) {
        return res.json({ success: true });
      }
      throw new RankError(500, "Couldn't add those interests");
   })
  .catch(next);
})
 
app.use(errorHandler);

It'll output:

HTTP/1.1 500 Internal Server Error
{
    "error": {
        "title": "Internal Server Error",
        "message": "Couldn't add those interests"
    }
}