err-http

const express = require('express'); const app = express(); const port = 3000; // Import specific error constructor for 400 Bad Request const BadRequestError = require('err-http/badrequest'); // Import the factory to create a custom error (e.g., HTTP 418 I'm a Teapot) const CustomTeapotError = require('err-http')('TeapotError', 'I am a teapot', 418); app.get('/api/resource', (req, res, next) => { // Simulate an invalid request if a required query parameter is missing if (!req.query.id) { return next(new BadRequestError('Missing required query parameter: id.')); } res.json({ message: `Resource with ID ${req.query.id} found.` }); }); app.get('/api/coffee', (req, res, next) => { // Simulate a custom teapot error for a coffee request next(new CustomTeapotError('Sorry, this server is a teapot and cannot brew coffee.')); }); // Generic error handling middleware app.use((err, req, res, next) => { console.error(err.stack); // `err-http` errors have a `status` property const status = err.status || 500; const message = err.message || 'Internal Server Error'; res.status(status).json({ error: message, code: status }); }); app.listen(port, () => { console.log(`Server listening at http://localhost:${port}`); console.log('Test with: http://localhost:3000/api/resource'); // Should return 400 console.log('Test with: http://localhost:3000/api/resource?id=123'); // Should return 200 console.log('Test with: http://localhost:3000/api/coffee'); // Should return 418 });