Mastering Server-Side Development with Fastify: A Guide
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Chapter 1: Introduction to Fastify
Fastify is a lightweight framework designed for building backend web applications using Node.js. This guide will walk you through the process of setting up and configuring Fastify for your projects.
Section 1.1: Initial Configuration
To set up the initial configuration for your Fastify application, you can initialize it as follows:
const { readFileSync } = require('fs');
const Fastify = require('fastify');
const fastify = Fastify({
allowHTTP1: true,
key: readFileSync('./fastify.key'),
cert: readFileSync('./fastify.cert')
},
logger: { level: 'trace' },
ignoreTrailingSlash: true,
maxParamLength: 200,
caseSensitive: true,
trustProxy: '127.0.0.1,192.168.1.1/24',
});
console.log(fastify.initialConfig);
fastify.get('/', async (request, reply) => {
return 'hello world';
});
const start = async () => {
try {
await fastify.listen(3000, '0.0.0.0');} catch (err) {
fastify.log.error(err);
process.exit(1);
}
};
start();
In this configuration:
- HTTPS options are specified to enable secure connections.
- allowHTTP1 permits listening for HTTP1 requests.
- key and cert refer to your SSL key and certificate files.
- logger defines the logging verbosity.
- ignoreTrailingSlash allows the server to disregard trailing slashes in routes.
- caseSensitive enables case-sensitive route matching.
- trustProxy determines which proxies are trusted.
You can retrieve the current configuration using the fastify.initialConfig property.
Section 1.2: Dynamic Configuration Changes
Fastify also allows for runtime adjustments to its configuration. To demonstrate this, you can set up a route that modifies the allowHTTP1 option as follows:
fastify.register(async (instance, opts) => {
instance.get('/', async (request, reply) => {
return instance.initialConfig;});
instance.get('/error', async (request, reply) => {
instance.initialConfig.https.allowHTTP1 = false;
return instance.initialConfig;
});
});
The properties you can expose and modify include: connectionTimeout, keepAliveTimeout, bodyLimit, caseSensitive, and more.
Chapter 2: Defining Routes
To define routes, you can utilize the fastify.route method. Here's how to create a simple GET route:
const fastify = require('fastify')();
fastify.route({
method: 'GET',
url: '/',
schema: {
querystring: {
name: { type: 'string' },
excitement: { type: 'integer' }
},
response: {
200: {
type: 'object',
properties: {
hello: { type: 'string' }}
}
}
},
handler: function (request, reply) {
reply.send({ hello: 'world' });}
});
const start = async () => {
try {
await fastify.listen(3000, '0.0.0.0');} catch (err) {
fastify.log.error(err);
process.exit(1);
}
};
start();
In this example, we define a GET route that accepts a query string and specifies the expected response format.
The first video titled "Fastify - Build your first route - YouTube" provides a step-by-step walkthrough on how to create your first route with Fastify.
The second video, "Fastify Basics tutorial | Alternative to Express | Node.js web framework - YouTube," covers the basics of Fastify and how it serves as an alternative to Express for Node.js applications.
Conclusion
In summary, Fastify allows for efficient setup and configuration of backend applications while providing the ability to define routes easily. With this guide, you are now equipped to start your journey with Fastify.