expressjsHow do I create an Express.js boilerplate?

1. To create an Express.js boilerplate, first install Express.js using the command npm install express.
2. Create a file named server.js and add the following code to it:

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

app.get('/', (req, res) => {
  res.send('Hello World!');
});

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

app.listen(port, () => console.log(`Server running on port ${port}`));

This will create an Express.js server that listens on port 5000 and responds to requests with "Hello World!"

3. To add additional routes, add a GET or POST request to the app object, like this:

app.get('/about', (req, res) => {
  res.send('About page');
});

This adds a route to the /about page.

4. To add middleware to the application, use app.use() like this:

app.use(express.json());

This adds the express.json() middleware to the application.

5. To add a template engine, install the desired template engine and then configure Express.js to use it. For example, to use Pug, install it using npm install pug and then add the following code to server.js:

app.set('view engine', 'pug');

6. To serve static files, use app.use() like this:

app.use(express.static('public'));

This will serve all files in the public directory.

7. To add a database, install the desired database driver and then configure Express.js to use it. For example, to use Mongoose, install it using npm install mongoose and then add the following code to server.js:

const mongoose = require('mongoose');

mongoose
  .connect('mongodb://localhost/my_database', {
    useNewUrlParser: true,
    useUnifiedTopology: true
  })
  .then(() => console.log('Connected to MongoDB...'))
  .catch(err => console.error('Could not connect to MongoDB...', err));

This will connect to a MongoDB database running on the local machine.

At this point, the Express.js boilerplate is complete.

Relevant Links

• Express.js
• Pug
• Mongoose

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