Beginner LevelExpress JS
How does calling next("route") skip remaining middleware in the current route stack?
❓ Interview Prompt: Explain calling next("route"), skipping execution of downstream handlers in the current route stack, and jumping to subsequent route declarations.
Calling 'next("route")' works ONLY inside middleware functions registered within route-level handler stacks (like 'app.get("/user/:id", middleware1, middleware2)').
Behavior:
Calling 'next("route")' immediately instructs Express to skip any remaining middleware in the current route stack and jump directly to the next matching route declaration!
Code Implementation Example
javascript
import express from 'express';
const app = express();
// Stack 1: Handles special admin user ID 0
app.get('/user/:id', (req, res, next) => {
if (req.params.id === '0') {
res.json({ user: 'System Admin' });
} else {
next('route'); // Skip remaining handlers in Stack 1; jump to Stack 2!
}
}, (req, res) => {
console.log('This second handler in Stack 1 is SKIPPED for non-admin users!');
});
// Stack 2: Handles standard users
app.get('/user/:id', (req, res) => {
res.json({ user: 'Standard User', id: req.params.id });
});💡Skipping downstream route stack handlers using next("route").
🎯 Interview Key Takeaway
Calling next("route") skips remaining middleware in the current route stack and jumps to the next route declaration.
#next#Routing#Control Flow#Beginner
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