Head-to-Head: Express vs Fastify Analysis

express

v4.18.3(about 23 hours ago)

This package is actively maintained.Types definitions are provided via a separate npm package: @types/expressNumber of direct dependencies: 31Monthly npm downloads

Express is a fast and minimalist web application framework for Node.js. It provides a simple and flexible way to build web applications and APIs. With Express, you can easily handle HTTP requests, define routes, and implement middleware to add functionality to your application.

Alternatives:
koa+
fastify+
hapi+
restify+
sails+
polka+
micro+
feathers+
nestjs+
adonisjs+

Tags: javascriptwebframeworknode.jshttp

fastify

v4.26.1(18 days ago)

This package is actively maintained.Types definitions are bundled with the npm packageNumber of direct dependencies: 16Monthly npm downloads

Fastify is a highly efficient and low-overhead web framework for Node.js. It is designed to be fast, lightweight, and developer-friendly. Fastify boasts impressive performance benchmarks, making it an excellent choice for building high-performance web applications and APIs.

Alternatives:
express+
koa+
hapi+
restify+
polka+
micro+
sails+
nestjs+
feathers+
adonisjs+

Tags: node.jsweb frameworkperformancemodularasync/await

Fight!

Popularity

Express has been the dominant choice for building web applications in the Node.js ecosystem for a long time and has a large and established community. Fastify, on the other hand, is a relatively newer framework but has gained popularity rapidly due to its focus on performance. It has a smaller but growing community.

Performance

Fastify is known for its excellent performance due to its emphasis on being lightweight and highly efficient. It achieves this through various optimizations, such as using schema-based request validation and supporting asynchronous request handlers. Express is also performant but is generally considered to be slightly slower than Fastify.

Middleware and Ecosystem

Express has a vast ecosystem of third-party middleware and plugins available, making it extremely flexible and suitable for a wide range of use cases. Fastify, being a newer framework, has a smaller ecosystem but is still growing. It has its own ecosystem of plugins and middleware, and is also compatible with some Express middleware.

Developer Experience

Express has been a popular choice among developers for a long time and has extensive community support and documentation. It has a simple and intuitive API, making it easy to get started with. Fastify also has good documentation and an easy-to-use API, providing a pleasant developer experience.

Scalability

Both Express and Fastify are capable of handling large-scale applications. However, Fastify's focus on performance and its ability to handle a high number of concurrent requests can make it a better choice for highly scalable applications where performance is a critical factor.

Compatibility with Existing Codebases

Express has been around for a long time and is widely used, making it compatible with many existing codebases. Fastify, being a newer framework, might require some adjustments and code changes when migrating from Express. However, Fastify does provide compatibility with Express middleware, which can ease the transition.