How do I create API routes in Express.js?

How do I create API routes in Express.js?

To create API routes in Express.js, you can use the app.get(), app.post(), app.put(), and app.delete() methods. For example, to create a GET route, you can do the following:

const express = require('express');
const app = express();

app.get('/api/users', (req, res) => {
    res.send('List of users');
});

app.listen(3000, () => {
    console.log('Server is running on port 3000');
});

What if I want to handle different HTTP methods?

You can handle different HTTP methods by using the corresponding methods in Express. For example:

app.post('/api/users', (req, res) => {
    res.send('User created');
});

app.put('/api/users/:id', (req, res) => {
    res.send(`User with ID ${req.params.id} updated`);
});

app.delete('/api/users/:id', (req, res) => {
    res.send(`User with ID ${req.params.id} deleted`);
});

How can I add middleware to my routes?

You can add middleware by passing it as an additional argument in your route definitions. For example:

const checkAuth = (req, res, next) => {
    // Authentication logic here
    next();
};

app.get('/api/users', checkAuth, (req, res) => {
    res.send('List of users');
});