express-promise-router

import express from 'express'; import PromiseRouter from 'express-promise-router'; const app = express(); const router = PromiseRouter(); // Mount the promise-aware router onto the express app app.use(router); // Example 1: Async/await route handler router.get('/users/:id', async (req, res) => { try { // Simulate fetching user data from a database const user = await Promise.resolve({ id: req.params.id, name: 'John Doe', permission: 'USER' }); if (user.permission !== 'ADMIN') { throw new Error('Access Denied: You must be an admin.'); } res.status(200).json({ message: `Welcome, ${user.name}!` }); } catch (error) { // Errors thrown from async functions are automatically caught and passed to next() // For this example, we'll manually send a response for clarity. // In a real app, an error handler middleware would catch this. throw error; // This will trigger the router's error handler } }); // Example 2: Promise resolution to call next() or next('route') router.get('/next-example', (req, res) => { // Equivalent to calling next() return Promise.resolve('next'); }); router.get('/next-example', (req, res) => { res.send('Reached the next handler!'); }); // Global error handler for the router (will catch errors from promise rejections) router.use((err, req, res, next) => { console.error('Caught an error:', err.message); res.status(err.statusCode || 500).send(err.message || 'Internal Server Error'); }); const PORT = process.env.PORT || 3000; app.listen(PORT, () => { console.log(`Server running on http://localhost:${PORT}`); });