error-handler-express-js

This is a simple error handler for Node.js with express.js

Installation

npm install --save error-handler-express-js

Usage

const express = require('express');
const { errorHandlerMiddleware, catchAsync } = require('error-handler-express-js');

const app = express();

// Define your routes here...

router.get('/ruta-async', catchAsync(async (req, res) => {
  throw new Error('Simulated error in asynchronous controller');
}));

// Error Trapping Middleware Logging
app.use(errorHandlerMiddleware);

app.listen(3000, () => {
console.log('Server running on http://localhost:3000');
});

another way to use it modular with controllers and services

// App.ts

const express = require('express');
const { errorHandlerMiddleware } = require('error-handler-express-js');

const app = express();

// Define your routes here...
app.use('/api/user', userRoutes);

// Error Trapping Middleware Logging
app.use(errorHandlerMiddleware);

app.listen(3000, () => {
console.log('Server running on http://localhost:3000');
});

// routes/userRoutes.ts

const router = require('express').Router();
const { catchAsync } = require('error-handler-express-js');
const { userController } = require('../controllers/userController');

router.post('/create', catchAsync(userController.createUser));

module.exports = router;

// controllers/userController.ts

const { userServices } = require('../services/userServices');

const UserController = {

  async createUser(req, res, next) {
      const result = await userServices.createUser(req.body);
      res.json(result);
    }
}

module.exports = UserController;

// services/userServices.ts

const { errorHandler,responseHandler } = require('error-handler-express-js');

const UserServices = {

async createUser(data) {
    try {

      const response = await userRepository.getUserBycode(data.code); // Data base operation
      if(response) {
        throw errorHandler.conflict('There is already a user with this code').build();
      }

      await userRepository.createUser(data); // Data base operation

      return responseHandler('Data saved successfully');

    } catch (err: any) {
      throw errorHandler.error(err, 'message').method('createUser').debug(data).build();
    }
  }
}

module.exports = UserServices;

log

// Error Trapping Middleware Logging Example
Error:  {
statusCode: 409,
params: {
  code: '12345678',
  name: 'user',
},
method: 'createUser',
message: 'There is already a user with this code'
}
Error   
  at UserServices.<anonymous> (/[service-route]/services/User-services.ts:38:63)
  at Generator.next (<anonymous>)
  at fulfilled (/[service-route]/services/User-services.ts:5:58)
  at processTicksAndRejections (node:internal/process/task_queues:96:5)
Error: {
"statusCode": 409,
"message": "There is already a user with this code"
}