Building Applications with Hapi.js

Hapi.js is a rich framework for building applications and services in Node.js. It is designed to be flexible, allowing developers to create powerful web applications while maintaining a clear and concise structure.

To start using Hapi.js, you need to install it via npm. Run the following command in your terminal:

npm install @hapi/hapi

To create a simple Hapi.js server, follow these steps:

const Hapi = require('@hapi/hapi');

const init = async () => {
    const server = Hapi.server({
        port: 3000,
        host: 'localhost'
    });

    await server.start();
    console.log('Server running on %s', server.info.uri);
};

process.on('unhandledRejection', (err) => {
    console.log(err);
    process.exit(1);
});

init();
                

Routes are fundamental in Hapi.js for handling requests. Here’s how to define a basic route:

server.route({
    method: 'GET',
    path: '/',
    handler: (request, h) => {
        return 'Hello, Hapi.js!';
    }
});
                

Hapi.js provides robust input validation using Joi. Here’s how to validate a request:

const Joi = require('joi');

server.route({
    method: 'POST',
    path: '/user',
    handler: (request, h) => {
        return `User ${request.payload.name} created!`;
    },
    options: {
        validate: {
            payload: Joi.object({
                name: Joi.string().min(3).required(),
                age: Joi.number().integer().min(0)
            })
        }
    }
});
                

Hapi.js supports a powerful plugin system. Here’s how to register a plugin:

const HapiAuthJWT = require('@hapi/cookie');

const init = async () => {
    await server.register(HapiAuthJWT);
    // ... other setup
};
                

• Use async/await for asynchronous code.
• Organize routes in separate modules.
• Utilize Hapi's built-in validation features.
• Implement error handling globally.
• Use environment variables for configuration.