Separation of concerns between the front-end and back-end.

Here's a technical tip for junior developers:

When developing a fullstack web application, it's important to have a clear separation of concerns between the front-end and back-end. One way to achieve this is by creating a RESTful API to communicate between the two.

Here's an example of how to create a simple RESTful API using Node.js and Express:

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

// Define a route for getting all users
app.get('/users', (req, res) => {
  // Code to fetch all users from the database
  const users = [
    { id: 1, name: 'John' },
    { id: 2, name: 'Jane' },
    { id: 3, name: 'Bob' }
  ];

  res.json(users);
});

// Define a route for getting a single user by ID
app.get('/users/:id', (req, res) => {
  // Code to fetch a user by ID from the database
  const user = { id: req.params.id, name: 'John' };

  res.json(user);
});

// Start the server
app.listen(3000, () => {
  console.log('Server started on port 3000');
});

In this example, we're using Express to define two routes for getting all users and a single user by ID. We're also returning JSON data from the routes, which can be easily consumed by the front-end.

By creating a RESTful API like this, we can keep the front-end and back-end code separate and make it easier to maintain and scale our application.