fastify: A JavaScript repository from lavyun

An efficient server implies a lower cost of the infrastructure, a better responsiveness under load and happy users. How can you efficiently handle the resources of your server, knowing that you are serving the highest number of requests as possible, without sacrificing security validations and handy development?

Enter Fastify. Fastify is a web framework highly focused on providing the best developer experience with the least overhead and a powerful plugin architecture. It is inspired by Hapi and Express and as far as we know, it is one of the fastest web frameworks in town.

Install

npm i fastify --save

Example

// Require the framework and instantiate it
const fastify = require('fastify')()

// Declare a route
fastify.get('/', function (request, reply) {
  reply.send({ hello: 'world' })
})

// Run the server!
fastify.listen(3000, function (err) {
  if (err) throw err
  console.log(`server listening on ${fastify.server.address().port}`)
})

with async-await:

const fastify = require('fastify')()

fastify.get('/', async (request, reply) => {
  reply.type('application/json').code(200)
  return { hello: 'world' }
})

fastify.listen(3000, function (err) {
  if (err) throw err
  console.log(`server listening on ${fastify.server.address().port}`)
})

Do you want to know more? Head to the Getting Started.

Core features

100% asynchronous: all the core is implemented with asynchronous code, in this way not even a millisecond is wasted.
Highly performant: as far as we know, Fastify is one of the fastest web frameworks in town, depending on the code complexity we can serve up to 34000 requests per second.
Extendible: Fastify is fully extensible via its hooks, plugins and decorators.
Schema based: even if it is not mandatory we recommend to use JSON Schema to validate your routes and serialize your outputs, internally Fastify compiles the schema in a highly performant function.
Logging: logs are extremely important but are costly; we chose the best logger to almost remove this cost, Pino!
Developer friendly: the framework is built to be very expressive and help the developer in his daily use, without sacrificing performance and security.

Benchmarks

Machine: Intel Xeon E5-2686 v4 @ 2.30GHz (4 cores, 8 threads), 16GiB RAM (Amazon EC2 m4.xlarge)

Method:: autocannon -c 100 -d 10 -p 10 localhost:3000 * 2, taking the second average

Framework	Version	Router?	Requests/sec
hapi	16.6.2	✓	5,768
Restify	5.2.0	✓	17,589
Express	4.16.1	✓	20,860
total.js	2.8.0	✓	22,201
Koa (`koa-router`)	2.3.0 (`koa-router@7.2.1`)	✓	23,093
Koa	2.3.0	✗	25,571
take-five	1.3.4	✓	28,255
micro (`micro-router`)	9.0.0 (`micro-router@2.2.3` )	✓	28,700
connect (`router`)	3.6.5 (`router@1.3.2`)	✓	33,753
Fastify	0.29.2	✓	34,613
micro	9.0.0	✗	36,522
connect	3.6.5	✗	37,810
-
`http.Server`	8.6.0	✗	39,952

Benchmarks taken using https://github.com/fastify/benchmarks. This is a synthetic, "hello world" benchmark that aims to evaluate the framework overhead. The overhead that each framework has on your application depends on your application, you should always benchmark if performance matters to you.

The relative overhead of micro, connect and fastify is too small to measure, and they perform very closely on this benchmarks.

Documentation

Ecosystem

fastify-accepts to have accepts in your request object.
fastify-accepts-serializer to serialize to output according to Accept header
fastify-apollo Run an Apollo Server with Fastify. (GraphQL)
fastify-auth Run multiple auth functions in Fastify
fastify-bankai Bankai assets compiler for Fastify
fastify-bearer-auth Bearer auth plugin for Fastify
fastify-cookie Parse and set cookie headers
fastify-env Load and check configuration
fastify-formbody Plugin to parse x-www-form-urlencoded bodies
fastify-graceful-shutdown Shutdown Fastify graceful asynchronously
fastify-helmet Important security headers for Fastify
fastify-hemera Fastify Hemera plugin, for writing reliable & fault-tolerant microservices with nats.io
fastify-jwt JWT utils for Fastify, internally uses jsonwebtoken
fastify-leveldb Plugin to share a common LevelDB connection across Fastify.
fastify-mongodb Fastify MongoDB connection plugin, with this you can share the same MongoDb connection pool in every part of your server.
fastify-multipart Multipart support for Fastify
fastify-nats Plugin to share NATS client across Fastify.
fastify-orientdb Fastify OrientDB connection plugin, with this you can share the orientdb connection in every part of your server.
fastify-postgres Fastify PostgreSQL connection plugin, with this you can share the same PostgreSQL connection pool in every part of your server.
fastify-react React server side rendering support for Fastify with Next
fastify-redis Fastify Redis connection plugin, with this you can share the same Redis connection in every part of your server.
fastify-register-timeout Register plugin with a timeout
fastify-sse to provide Server-Sent Events with reply.sse( … ) to Fastify
fastify-swagger Swagger documentation generator for Fastify
fastify-websocket WebSocket support for Fastify. Built upon websocket-stream
point-of-view Templates rendering (ejs, pug, handlebars, marko) plugin support for Fastify.
More coming soon

Team

Fastify is the result of the work of a great community. Team members are listed in alphabetical order.

lavyun/fastify

Install

Example

Core features

Benchmarks

Documentation

Ecosystem

Team

Lead Maintainers

Collaborators

Acknowledgements

License