Fastify – framework overview, implementation, execs, and cons

Net frameworks make constructing Node.js internet functions simpler. They take the guesswork out of dealing with requests and HTTP strategies. They supply dynamic HTML rendering, templates, and architectural patterns that make creating apps simpler. Over time, Specific grew to become the Node.js internet framework of alternative. However is it all the time the perfect one? The creators of Fastify consider that it’s not the case. I used to be capable of expertise Fastify first-hand throughout a current venture. Do I facet with them or not?

Only a whereas in the past, my Node.js crew and I labored on a venture of a reward system for gamers of assorted free-to-play on-line video games. The shopper wished to revamp the entire app dramatically. For all intents and functions, we have been to develop a complete new model of the system.

One of many major venture necessities was rising the velocity of the system. The app had quite a lot of customers who carried out quite a lot of actions. The requests per second metric was of explicit significance.

Our pure framework of alternative for Node.js-based was Specific. It’s straightforward to study, very properly documented, and extremely versatile. However since velocity was imagined to be such an enormous issue, we determined to take a more in-depth have a look at different choices with a view to make a correct velocity comparability.

Quickly sufficient, we began contemplating a framework that bears a reputation that’s meant to make you immediately consider velocity – Fastify.

What’s Fastify?

Fastify is a Node.js library that was created by Matteo Collina and David Mark Clements in late 2016. The most recent model out there’s 4.7.0. If you’re within the launch historical past, verify the details about long-term help and corresponding launch notes.

In response to the creators:

Fastify was born out of a need to create a general-purpose internet framework that would offer an ideal developer expertise with out compromising on throughput and efficiency.

Fastify is downloaded greater than 700,000 occasions per week. At this second, it’s utilized in about 25,000 tasks. A number of firms are already on board, together with giants comparable to Microsoft. Listed here are a number of the companies that use Fastify.

Fastify efficiency – velocity check

When the shopper expressed their curiosity in prioritizing utility velocity, we determined to check out Fastify. They are saying it is likely one of the quickest internet frameworks. Naturally, we couldn’t choose it up on fame alone.

We tried to search out as many analysis sources on the subject of Fastify as potential. Then, we determined to run exams on our personal.

To that finish, we used the wg/wrk benchmarking device. We in contrast Fastify and Specific in 10 impartial exams. We anticipated Fastify to be quicker, however we wanted detailed info to determine whether or not altering the Node.js framework is definitely worth the hassle.

The comparability included quite a few components:

  • requests per second,
  • variety of requests served in 30 seconds, 
  • switch per second,
  • common latency. 

Right here is our Fastify check information:

Fastify vs Express speed test part 2
Fastify vs Specific comparability – half 1
Fastify vs Express speed test part 1
Fastify vs Specific comparability – half 2
Fastify and Express speed results
Total velocity check outcomes

In each single check, Fastify proved superior. On common, the framework carried out about 25 p.c higher than Specific.

Our findings each stunned and impressed us. They influenced our resolution to modify to Fastify. Nevertheless, they have been hardly the one issue.

With the intention to clarify it absolutely, let’s take a more in-depth have a look at the framework.

What’s Fastify? – obtain the infographic

Why use Fastify?

Based mostly on our observations, Fastify’s benefits may be grouped into 4 classes.


We already talked about velocity. However Fastify can also be extremely scalable, making the framework appropriate for each small and huge tasks. The JSON format robotically analyzes Fastifiy’s features, making certain quick routing of knowledge packets throughout the community. That’s what makes the framework lightning-fast.


Fastify is a low overhead internet framework, which minimizes upkeep prices for the complete utility. Along with that, it’s an online framework extremely targeted on safety that ensures a system of computerized safety and information validation.


Fastify helps TypeScript, cooperates with AWS Lambda, and communicates with its API by way of a GraphQL adapter. In consequence, it’s nice for internet utility improvement in addition to API interface improvement.

Ease of improvement

One in all Fastify’s largest execs in serverless functions is the benefit of improvement. In your native surroundings, you’ll all the time run the Fastify utility straight, with out the necessity for any extra instruments, whereas the identical code can be executed in your serverless platform of alternative with an extra snippet of code.

TypeScript recommended image
Why is the help for TypeScript so essential? Learn our Why use TypeScript article and discover out!

Do you suppose that Fastify may very well be the expertise to your subsequent venture?

Why don’t you contact us to seek the advice of it?

Using Fastify and Express meme

Do you need to effectively deal with your server’s assets whereas serving the best variety of requests potential? Do you need to do all that with out sacrificing safety validations and helpful improvement? 

Fastify was made for this situation.

The venture I discussed earlier than is an ideal instance of such a situation. The shopper anticipated the app for use by an unlimited variety of folks. And since we wished the brand new model to be a particular improve of model one with regards to efficiency, altering Specific to Fastify was a logical step.

When not to make use of Fastify?

Naturally, every little thing has its execs and cons – Fastify isn’t any exception. As of 2022, the framework just isn’t broadly used within the business. It’s being more and more adopted, however its use remains to be modest when in comparison with Specific or Nest.

Along with that, being a reasonably younger venture, the documentation just isn’t as expansive as you would possibly anticipate from extra mature frameworks. The neighborhood help is so-so. If you happen to plan on utilizing a library comparable to passport.js, one can find that it doesn’t work with Fastify. Guarantee that Fastify is appropriate with all the different items of software program you need to use.

If you’re an inexperienced developer on the lookout for a job, you would possibly discover that only a few employers are presently on the lookout for devs that know Fastify particularly. Consequently, you is perhaps higher served going for one thing extra mainstream.

Nevertheless, when you already know Specific, studying Fastify can provide you extra choices to make use of in your venture and supply with you a special perspective on internet improvement in Node.js. Its structure actually stands out and that alone makes it value trying out. However extra on that later.

Fastify is great but meme

Fastify sensible tutorial

If you happen to suppose that Fastify is one thing for you, stick round as a result of we’re going to reveal how one can implement it in order that it could actually help your individual venture. 


We’re going to make a easy Fastify venture. The implementation of Fasitfy is kind of much like what you might need skilled with Specific.js.

Let’s begin with the implementation of fundamental modules: router, app, and server.

To do that, we’re going to recreate three recordsdata:

  1. server.js – the principle script of the appliance,
  2. app.js – the script wherein we create a Fastify Node server occasion,
  3. router.js – Fastify router occasion that helps us encapsulate routes and plugins.

We’re going to create a complete of 4 ts recordsdata within the course of: server.ts, app.ts, router.ts, and routing.ts. 

For Server.ts, we merely use our createApp operate from app.ts. We begin by defining a port on which the server can be listening. The file additionally features a easy instance of the way to use Fastify’s logger.

The app.ts file is the center of our code. Right here, we create the createApp operate that initializes the Fastify occasion. Right here, we additionally register plugins by way of app.register (the instance proven registers cors, helmet, and swagger). The router can also be registered right here.

The router.ts defines the way in which wherein the shopper requests are dealt with by the appliance endpoints. The router gathers routings for all of the options. Within the instance beneath, we register usersRouting within the router. We cross the router to app.js. That’s additionally the place we register it.

There’s additionally routing.ts. It handles routing for customers. We use it to outline each endpoint associated to customers. The instance exhibits how one can outline the get endpoint.

Fastify’s plugins

One of the vital essential modifications Fastify brings is changing middleware with plugins. Fastify actually does have a robust plugin structure. What are these plugins? 

A Fastify plugin is usually a set of routes, a server decorator, or just about something. Let’s say we have to ship queries to the database from numerous utility modules. Do we have to connect with the database, export the connection, after which import it into any modules we have to use it in? This works however ends in spaghetti code. 

That is the place the Fastify plugin system shines probably the most. It permits us to inject our dependencies right into a Fastify occasion after which use them anyplace we now have entry to the occasion. It additionally helps to simply transfer from a monolithic construction to microservices since every service is usually a standalone plugin.

The Fastify ecosystem of plugins is ever-growing. There’s most likely already a plugin to your favourite database or template language and even performance.

Listed here are a few examples:

  • cors -> Fastify-cors,
  • helmet -> Fastify-helmet,
  • express-jwt -> Fastify-jwt,
  • multer -> Fastify-multer,

…. and plenty of extra!

Here’s a full checklist of all core Fastify plugins.

Getting probably the most out of Fastify

Fastify additionally has a variety of additional options that help you do much more.


Fastify makes use of Ajv beneath the hood, which lets you outline validation guidelines with JSON schema; Study extra about how validation works in Fastify.


Fastify makes use of a quick and versatile logger: pino. The logger occasion is obtainable on the Fastify server occasion (comparable to Fastify.log.information(“…”)) and on all Request objects (comparable to request.log.information(“…”));
Logger utilization is easy. You simply must allow it as a result of it’s disabled as default:

Then, you should use it like this:

Error dealing with

Fastify offers a setErrorHandler() methodology, which lets you explicitly specify a operate for error dealing with. For extra, you possibly can specify totally different Fastify error handlers utilizing plugins.
Fastify tries to catch as many uncaught errors as it could actually with out hindering efficiency. This consists of:

  1. synchronous routes:  app.get(‘/’, () => { throw new Error(‘kaboom’) })
  2. async routes:  app.get(‘/’, async () => { throw new Error(‘kaboom’) })


They permit us to customise core Fastify objects such because the server occasion itself and any request and reply objects used through the HTTP request lifecycle. The decorators API can be utilized to connect any sort of property to the core objects, e.g. features, plain objects, or native varieties.

Fastify studying assets

Wish to proceed your analysis into Fastify? There are quite a lot of fascinating assets on the market that may allow you to out:

Official Fastify web site

  • Certainly, you have to begin with the official Fastify web site, which has the docs, benchmarks, and extra.

Fastify npm

  • The package deal supervisor for Node.js has a Fastify web page with tons of helpful info, together with variations, dependencies, guides, and whatnot.

Fastify’s Github

  • The go-to place for the newest contributions to the Fastify framework codebase.

Migrating from Specific to Fastify

  • A really helpful and sensible article for everybody who desires emigrate from Specific to Fastify in an present venture. It’s a extremely beneficial learn.

Specific vs Fastify efficiency comparability

  • This text has a really fascinating choice of efficiency information for Specific and Fastify.
Fastify npm site
The npm web page for Fastify has tons of helpful info on the framework

Fastify and internet improvement developments

Fastify is consistently evolving. The Fastify framework is written in vanilla JavaScript, and as such sort definitions aren’t as straightforward to keep up; nonetheless, since model 2 and past, maintainers and contributors have put in an ideal effort to enhance the categories.

Fastify sort system

The kind system was modified in Fastify model 3. The brand new sort system introduces generic constraining and defaulting, plus a brand new technique to outline schema varieties comparable to a request physique, question string, and extra! 

Because the crew works on bettering framework and sort definition synergy, typically components of the API won’t be typed or could also be typed incorrectly. That’s why it’s drastically appropriate with Typescript.

Fastify – conclusions & classes realized

Contemplating simply how a lot builders love Specific, one would possibly ask – do we actually want yet one more internet framework for Node.js?

My private opinion is a powerful: YES. Wholesome competitors all the time spurs progress, resulting in a endless drive in direction of quicker, higher, and extra environment friendly options.

Fastify actually has the makings of an ideal framework. I already take into account it to be an ideal alternative for each internet improvement and API improvement, for quite a few causes:

  • It’s quick, economical, and helps TypeScript out-of-the-box. The latter is an enormous bonus for big business tasks.
  • It really works nice with a wide range of progressive applied sciences widespread in modern-day internet improvement, comparable to AWS Lambda, or GraphQL.
  • It performs to its strengths, specializing in dealing with the assets of your server effectively and quick

Nevertheless, good previous Specific remains to be right here and is one thing all of us can depend on. On the finish of the day, there’s no good cause to completely restrict your self to 1 framework, and shun all of the newcomers. Then again, you shouldn’t immediately go right into a frenzy of refactoring each internet utility to Fastify both. 

Within the close to future, it’s secure to say that Fastify won’t overtake Specific when it comes to recognition (Specific with its 25 million downloads is gigantic), however I feel that it’ll actually develop, and except some new “competitor” is discovered, it could in the future grow to be as widespread as Specific. It actually feels prefer it has all it takes.

I hope that by the point you begin your subsequent Node.js venture, you’ll have carried out sufficient analysis into Fastify to make an knowledgeable alternative on whether or not it’s a good match for the event!

Node.js is a key expertise within the improvement of microservices

Study extra in regards to the newest microservices developments from the State of Microservices report

Mariusz Poręba

Mariusz Poręba

Node.js developer

Mariusz’s been working in IT for about 2 years, The Software program Home being his first job as a Node.js developer. He has a knack for studying new abilities, which extends far past software program. He loves taking part in chess and different board video games. Tea > espresso.


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