Back to Express JS Course

To handle PATCH requests in Express JS, you typically use the .patch() method of an Express router.

import express from "express"

const app = express();

const PORT = process.env.PORT || 5000;

const mockUsers = [
    { id: 1, name: 'Praveen', designation: 'Technical Architect', city: 'Hyderabad' },
    { id: 2, name: 'Prasad', designation: 'Technical Lead', city: 'Bangalore' },
    { id: 3, name: 'Anusha', designation: 'Lead Developer', city: 'Chennai' },
    { id: 4, name: 'Ravi', designation: 'Developer', city: 'Hyderabad' },
    { id: 5, name: 'Kiran', designation: 'Technical Lead', city: 'Hyderabad' },
];

// Middleware to parse JSON bodies
app.use(express.json());

// PATCH endpoint to update user by ID
app.patch('/api/v1_0/users/:id', (req, res) => {
    const id = parseInt(req.params.id);
    const updatedUser = req.body;

    // Find the user by ID
    const userToUpdate = mockUsers.find(user => user.id === id);

    // If the user is found, update its properties
    if (userToUpdate) {
        userToUpdate.name = updatedUser.name;
        userToUpdate.designation = updatedUser.designation;
        userToUpdate.city = updatedUser.city;
        res.status(200).json({ message: 'User updated successfully', user: userToUpdate });
    } else {
        res.status(404).json({ message: 'User not found' });
    }
});

app.listen(PORT, () => console.log(`Running on Port ${PORT}`));

Now lets patch an user using Postman.

Now lets fetch the users.