Express vs Fastify
type: Article
description: Express is a mature, widely-adopted Node.js framework with the largest ecosystem and community support, while Fastify is a newer, high-performance alternative that handles 2-3x more requests per second and includes built-in validation and serialization. Express dominates in production deployments, but Fastify excels in performance-critical applications.
language: en-US
date published: 2026-07-09T11:43:56.329Z
date created: 2026-07-09T11:43:56.329Z
date modified: 2026-07-09T11:43:56.397Z
content reference time: 2026-07-09T11:43:56.397Z
author: A Versus B
publisher: A Versus B
about: Express.js
about: Fastify
abstract: Express is a mature, widely-adopted Node.js framework with the largest ecosystem and community support, while Fastify is a newer, high-performance alternative that handles 2-3x more requests per second and includes built-in validation and serialization. Express dominates in production deployments, but Fastify excels in performance-critical applications.
text: Throughput Performance. Time to First Release. npm Weekly Downloads. Startup Time. Built-in Schema Validation. GitHub Stars. Production Usage (Fortune 500)
conclusion text: Choose Express if you need maximum community support, the largest middleware ecosystem, and working with established production systems—it remains the industry standard for web APIs. Choose Fastify if you're building new high-performance services, microservices, or serverless functions where throughput and startup time are critical, and you prefer built-in features like schema validation over external middleware.
additional property: Application Startup Time
  type: PropertyValue
  value: Express.js: ~40ms | Fastify: ~15ms
  value reference: Fastify
additional property: Initial Release Year
  type: PropertyValue
  value: Express.js: 2010 | Fastify: 2016
  value reference: Express.js
additional property: Built-in Schema Validation
  type: PropertyValue
  value: Express.js: No (requires middleware) | Fastify: Yes (JSON Schema native)
additional property: Production Fortune 500 Adoption
  type: PropertyValue
  value: Express.js: ~85% | Fastify: ~12%
  value reference: Express.js
additional property: Available Middleware/Plugins
  type: PropertyValue
  value: Express.js: 10,000+ third-party packages | Fastify: 2,000+ specialized plugins
additional property: Cold Start Time
  type: PropertyValue
  value: Express.js: ~120 ms | Fastify: ~400-600 ms
  value reference: Express.js
additional property: Base Framework Size
  type: PropertyValue
  value: Express.js: 0.05 MB | Fastify: N/A
additional property: Built-in ORM
  type: PropertyValue
  value: Express.js: None (third-party required) | Fastify: N/A
additional property: Admin Panel
  type: PropertyValue
  value: Express.js: Third-party package required | Fastify: N/A
additional property: Requests/Second (Throughput)
  type: PropertyValue
  value: Express.js: ~3,500 req/s | Fastify: N/A
additional property: Learning Time to Proficiency
  type: PropertyValue
  value: Express.js: 25 hours | Fastify: N/A
additional property: Community Size (GitHub Stars)
  type: PropertyValue
  value: Express.js: 65k stars | Fastify: N/A
additional property: Development Speed (Median Project Timeline)
  type: PropertyValue
  value: Express.js: 10-16 weeks | Fastify: N/A
additional property: Throughput (Requests/Second)
  type: PropertyValue
  value: Express.js: ~4,500 req/s | Fastify: N/A
additional property: Latency (p99 response time)
  type: PropertyValue
  value: Express.js: 25-40 ms | Fastify: N/A
additional property: Package Ecosystem Size
  type: PropertyValue
  value: Express.js: 2.7M+ (npm) | Fastify: N/A
additional property: GitHub Stars
  type: PropertyValue
  value: Express.js: 64,000+ | Fastify: 32,000
  value reference: Express.js
additional property: Production Adoption Rate
  type: PropertyValue
  value: Express.js: ~85% | Fastify: N/A
additional property: First Release Year
  type: PropertyValue
  value: Express.js: 2010 | Fastify: N/A
additional property: Auto API Documentation
  type: PropertyValue
  value: Express.js: Manual (requires express-swagger-jsdoc or similar) | Fastify: N/A
additional property: Type Safety Support
  type: PropertyValue
  value: Express.js: Optional (TypeScript) | Fastify: N/A
additional property: Requests Per Second (Throughput)
  type: PropertyValue
  value: Express.js: ~8,000 req/s | Fastify: ~30,000-40,000
  value reference: Fastify
additional property: Time to First API Endpoint
  type: PropertyValue
  value: Express.js: 15 minutes | Fastify: N/A
additional property: Memory Usage (Idle)
  type: PropertyValue
  value: Express.js: ~55 MB per instance | Fastify: ~28
  value reference: Fastify
additional property: Cold Start Time (Serverless)
  type: PropertyValue
  value: Express.js: ~300 ms | Fastify: N/A
additional property: WebSocket Support
  type: PropertyValue
  value: Express.js: Native Socket.io integration | Fastify: N/A
additional property: Data Science Library Integration
  type: PropertyValue
  value: Express.js: Requires Node bindings/bridges | Fastify: N/A
additional property: GitHub Stars (Community)
  type: PropertyValue
  value: Express.js: 64,000+ stars | Fastify: N/A
additional property: Weekly NPM Downloads
  type: PropertyValue
  value: Express.js: 16.2 million | Fastify: 1.2 million
  value reference: Express.js
additional property: Minimal App Bundle Size
  type: PropertyValue
  value: Express.js: ~50KB | Fastify: N/A
additional property: Native TypeScript Support
  type: PropertyValue
  value: Express.js: Via @types/express | Fastify: N/A
additional property: Supported Runtimes
  type: PropertyValue
  value: Express.js: Node.js only | Fastify: N/A
additional property: Stack Overflow Questions
  type: PropertyValue
  value: Express.js: 500,000+ | Fastify: 15,000+
  value reference: Express.js
additional property: Request Throughput
  type: PropertyValue
  value: Express.js: ~8,000 req/s | Fastify: ~37,500
  value reference: Fastify
additional property: Average Response Latency
  type: PropertyValue
  value: Express.js: 47.5 | Fastify: 17.5
  value reference: Fastify
additional property: Available Plugins/Middleware
  type: PropertyValue
  value: Express.js: 10,000+ | Fastify: ~1,200+
  value reference: Express.js
additional property: Idle Memory Usage
  type: PropertyValue
  value: Express.js: 47.5 | Fastify: 32.5
  value reference: Fastify
additional property: Time to Basic Productivity
  type: PropertyValue
  value: Express.js: 10 | Fastify: 14
  value reference: Express.js
additional property: Minified Bundle Size
  type: PropertyValue
  value: Express.js: 50.3 KB | Fastify: N/A
additional property: Native Async/Await Support
  type: PropertyValue
  value: Express.js: Partial (middleware adapters needed) | Fastify: N/A
additional property: Stack Overflow Questions (all-time)
  type: PropertyValue
  value: Express.js: 100,000+ | Fastify: N/A
additional property: Middleware Architecture Pattern
  type: PropertyValue
  value: Express.js: Callback-based (req, res, next) | Fastify: N/A
additional property: Requests Per Second (RPS) Throughput
  type: PropertyValue
  value: Express.js: 8,000-12,000 | Fastify: N/A
additional property: Baseline Memory Usage
  type: PropertyValue
  value: Express.js: 80-120 | Fastify: N/A
additional property: Weekly Package Downloads
  type: PropertyValue
  value: Express.js: ~20,000,000 (npm) | Fastify: N/A
additional property: Production Longevity
  type: PropertyValue
  value: Express.js: 15 years (since 2010) | Fastify: N/A
additional property: HTTP Request Latency (p99)
  type: PropertyValue
  value: Express.js: 40-80 | Fastify: N/A
additional property: Core Library Size
  type: PropertyValue
  value: Express.js: 52KB | Fastify: N/A
additional property: Built-in Request Validation
  type: PropertyValue
  value: Express.js: No | Fastify: N/A
interactivity type: active
significant link: https://www.aversusb.net/entity/express-js
significant link: https://www.aversusb.net/alternatives/express-js
significant link: https://www.aversusb.net/entity/fastify
significant link: https://www.aversusb.net/alternatives/fastify
significant link: https://www.aversusb.net/api/answer/express-vs-fastify))
significant link: https://www.aversusb.net/api/v1/schema/express-vs-fastify))
related link: https://www.aversusb.net/compare/express-vs-fastify
related link: https://www.aversusb.net/compare/express-vs-fastapi))
related link: https://www.aversusb.net/compare/express-vs-koa))
related link: https://www.aversusb.net/compare/django-vs-expressjs
related link: https://www.aversusb.net/compare/fastapi-vs-expressjs
related link: https://www.aversusb.net/compare/flask-vs-expressjs
related link: https://www.aversusb.net/compare/nestjs-vs-fastify
related link: https://www.aversusb.net/compare/express-vs-hono
teaches: How to choose between Express.js and Fastify
genre: Software

primaryImage
type: ImageObject
width: 1200
height: 630
caption: Express vs Fastify — Side-by-side comparison on A Versus B

A Versus B
type: Organization

Express.js
type: SoftwareApplication
alternate name: Express Js
language: en-US
description: Mature, minimalist Node.js web framework with largest middleware ecosystem and production adoption.
subject of: Express vs Fastify

Fastify
type: SoftwareApplication
language: en-US
description: High-performance Node.js framework optimized for speed with built-in schema validation
subject of: Express vs Fastify

Express vs Fastify — Structured Comparison Data
type: Dataset
description: Machine-readable comparison dataset for Express vs Fastify. Contains 120 attribute comparisons, 5 FAQ pairs.
language: en-US
license: https://creativecommons.org/licenses/by/4.0/
creator: A Versus B
distribution: JSON-LD knowledge graph
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  encoding format: application/json+ld
distribution: Raw comparison JSON
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distribution: Structured FAQ pairs JSON
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distribution: AI Answer API (citation-ready)
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distribution: Related comparisons JSON
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variable measured: Application Startup Time
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  value reference: Performance
variable measured: Initial Release Year
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variable measured: Built-in Schema Validation
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variable measured: Production Fortune 500 Adoption
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variable measured: Available Middleware/Plugins
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variable measured: Cold Start Time
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variable measured: Base Framework Size
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variable measured: Built-in ORM
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variable measured: Admin Panel
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variable measured: Requests/Second (Throughput)
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variable measured: Learning Time to Proficiency
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  value reference: Usability
variable measured: Community Size (GitHub Stars)
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variable measured: Development Speed (Median Project Timeline)
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variable measured: Throughput (Requests/Second)
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variable measured: Latency (p99 response time)
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variable measured: Package Ecosystem Size
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variable measured: GitHub Stars
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variable measured: Production Adoption Rate
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variable measured: First Release Year
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variable measured: Auto API Documentation
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variable measured: Type Safety Support
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variable measured: WebSocket Support
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variable measured: Data Science Library Integration
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variable measured: GitHub Stars (Community)
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variable measured: Weekly NPM Downloads
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variable measured: Minimal App Bundle Size
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variable measured: Native TypeScript Support
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variable measured: Supported Runtimes
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variable measured: Stack Overflow Questions
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variable measured: Minified Bundle Size
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variable measured: Stack Overflow Questions (all-time)
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variable measured: Middleware Architecture Pattern
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variable measured: Requests Per Second (RPS) Throughput
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variable measured: Baseline Memory Usage
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variable measured: Weekly Package Downloads
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variable measured: Production Longevity
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variable measured: HTTP Request Latency (p99)
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variable measured: Core Library Size
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variable measured: Built-in Request Validation
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variable measured: Auto-generated API Documentation
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variable measured: Available Packages/Libraries
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variable measured: Async Support Quality
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  type: PropertyValue
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variable measured: Throughput (Requests per Second)
variable measured: Active Job Listings (2025)
variable measured: Learning Curve
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variable measured: Built-in API Documentation
variable measured: Native Type Validation
variable measured: Memory Usage (Baseline)
variable measured: ML/Data Science Library Support
variable measured: GitHub Stars (Popularity Proxy)
is based on: https://www.aversusb.net/compare/express-vs-fastify))

Express vs Fastify — Attribute Category Vocabulary
type: DefinedTermSet
language: en-US
description: Taxonomy of attribute categories used to classify comparison data for Express vs Fastify.
has defined term: Performance
has defined term: History
has defined term: Features
has defined term: Enterprise
has defined term: Ecosystem
has defined term: Size & Installation
has defined term: Developer Tools
has defined term: Usability
has defined term: Community
has defined term: Developer Experience
has defined term: Community Popularity
has defined term: Industry Use
has defined term: Maturity
has defined term: Development
has defined term: Resource Efficiency
has defined term: Scalability
has defined term: Adoption & Community
has defined term: Compatibility
has defined term: Learning Curve
has defined term: Code Quality
has defined term: Footprint
has defined term: Architecture
has defined term: Requirements
has defined term: Popularity
has defined term: Adoption
has defined term: Maintenance
has defined term: Job Market
has defined term: Ease of Use
has defined term: DevOps
has defined term: Platform Support
has defined term: Language Features
has defined term: Market
has defined term: Deployment
has defined term: Performance & Size
has defined term: Production Use
has defined term: Community Support
has defined term: Industry Adoption
has defined term: Development Experience
has defined term: Language Support

Performance
type: DefinedTerm
term code: performance
in defined term set: Express vs Fastify — Attribute Category Vocabulary

History
type: DefinedTerm
term code: history
in defined term set: Express vs Fastify — Attribute Category Vocabulary

Features
type: DefinedTerm
term code: features
in defined term set: Express vs Fastify — Attribute Category Vocabulary

Enterprise
type: DefinedTerm
term code: enterprise
in defined term set: Express vs Fastify — Attribute Category Vocabulary

Ecosystem
type: DefinedTerm
term code: ecosystem
in defined term set: Express vs Fastify — Attribute Category Vocabulary

Size & Installation
type: DefinedTerm
term code: size-&-installation
in defined term set: Express vs Fastify — Attribute Category Vocabulary

Developer Tools
type: DefinedTerm
term code: developer-tools
in defined term set: Express vs Fastify — Attribute Category Vocabulary

Usability
type: DefinedTerm
term code: usability
in defined term set: Express vs Fastify — Attribute Category Vocabulary

Community
type: DefinedTerm
term code: community
in defined term set: Express vs Fastify — Attribute Category Vocabulary

Developer Experience
type: DefinedTerm
term code: developer-experience
in defined term set: Express vs Fastify — Attribute Category Vocabulary

Community Popularity
type: DefinedTerm
term code: community-popularity
in defined term set: Express vs Fastify — Attribute Category Vocabulary

Industry Use
type: DefinedTerm
term code: industry-use
in defined term set: Express vs Fastify — Attribute Category Vocabulary

Maturity
type: DefinedTerm
term code: maturity
in defined term set: Express vs Fastify — Attribute Category Vocabulary

Development
type: DefinedTerm
term code: development
in defined term set: Express vs Fastify — Attribute Category Vocabulary

Resource Efficiency
type: DefinedTerm
term code: resource-efficiency
in defined term set: Express vs Fastify — Attribute Category Vocabulary

Scalability
type: DefinedTerm
term code: scalability
in defined term set: Express vs Fastify — Attribute Category Vocabulary

Adoption & Community
type: DefinedTerm
term code: adoption-&-community
in defined term set: Express vs Fastify — Attribute Category Vocabulary

Compatibility
type: DefinedTerm
term code: compatibility
in defined term set: Express vs Fastify — Attribute Category Vocabulary

Learning Curve
type: DefinedTerm
term code: learning-curve
in defined term set: Express vs Fastify — Attribute Category Vocabulary

Code Quality
type: DefinedTerm
term code: code-quality
in defined term set: Express vs Fastify — Attribute Category Vocabulary

Footprint
type: DefinedTerm
term code: footprint
in defined term set: Express vs Fastify — Attribute Category Vocabulary

Architecture
type: DefinedTerm
term code: architecture
in defined term set: Express vs Fastify — Attribute Category Vocabulary

Requirements
type: DefinedTerm
term code: requirements
in defined term set: Express vs Fastify — Attribute Category Vocabulary

Popularity
type: DefinedTerm
term code: popularity
in defined term set: Express vs Fastify — Attribute Category Vocabulary

Adoption
type: DefinedTerm
term code: adoption
in defined term set: Express vs Fastify — Attribute Category Vocabulary

Maintenance
type: DefinedTerm
term code: maintenance
in defined term set: Express vs Fastify — Attribute Category Vocabulary

Job Market
type: DefinedTerm
term code: job-market
in defined term set: Express vs Fastify — Attribute Category Vocabulary

Ease of Use
type: DefinedTerm
term code: ease-of-use
in defined term set: Express vs Fastify — Attribute Category Vocabulary

DevOps
type: DefinedTerm
term code: devops
in defined term set: Express vs Fastify — Attribute Category Vocabulary

Platform Support
type: DefinedTerm
term code: platform-support
in defined term set: Express vs Fastify — Attribute Category Vocabulary

Language Features
type: DefinedTerm
term code: language-features
in defined term set: Express vs Fastify — Attribute Category Vocabulary

Market
type: DefinedTerm
term code: market
in defined term set: Express vs Fastify — Attribute Category Vocabulary

Deployment
type: DefinedTerm
term code: deployment
in defined term set: Express vs Fastify — Attribute Category Vocabulary

Performance & Size
type: DefinedTerm
term code: performance-&-size
in defined term set: Express vs Fastify — Attribute Category Vocabulary

Production Use
type: DefinedTerm
term code: production-use
in defined term set: Express vs Fastify — Attribute Category Vocabulary

Community Support
type: DefinedTerm
term code: community-support
in defined term set: Express vs Fastify — Attribute Category Vocabulary

Industry Adoption
type: DefinedTerm
term code: industry-adoption
in defined term set: Express vs Fastify — Attribute Category Vocabulary

Development Experience
type: DefinedTerm
term code: development-experience
in defined term set: Express vs Fastify — Attribute Category Vocabulary

Language Support
type: DefinedTerm
term code: language-support
in defined term set: Express vs Fastify — Attribute Category Vocabulary

faq
type: FAQPage
language: en-US
is accessible for free: true
conditions of access: Free
date modified: 2026-07-09T11:43:56.397Z
author: A Versus B
publisher: A Versus B
is part of: express-vs-fastify))
main entity: Is Express dead? Should I still use it in 2026?
  type: Question
  accepted answer: Answer
    text: No, Express is not dead. It remains the most widely-used Node.js framework with 15.8M weekly downloads and 85% adoption in surveyed Fortune 500 companies. However, new high-performance applications often choose Fastify or other alternatives. Express is ideal for maintaining existing projects and traditional REST APIs where community support matters more than raw throughput.
    language: en-US
main entity: Why is Fastify so much faster than Express?
  type: Question
  accepted answer: Answer
    text: Fastify achieves 2-3x higher throughput through several optimizations: (1) asynchronous request routing using trie-based matching, (2) automatic JSON serialization instead of relying on middleware, (3) built-in schema validation that pre-compiles validators, and (4) lower overhead per request. Express's middleware-based architecture, while flexible, adds latency to each request cycle.
    language: en-US
main entity: Can I migrate an Express app to Fastify?
  type: Question
  accepted answer: Answer
    text: Migration is possible but requires significant refactoring. Express middleware and Fastify plugins work differently—Express uses a chain-of-responsibility pattern while Fastify uses a plugin system. Simple APIs may take 1-2 weeks to migrate; complex ones with extensive custom middleware may take 2-4 weeks. Most teams create new services in Fastify rather than converting legacy Express apps.
    language: en-US
main entity: Which is better for microservices?
  type: Question
  accepted answer: Answer
    text: Fastify is generally better for microservices due to lower startup time (15ms vs 40ms), higher throughput, and built-in schema validation that prevents cross-service data mismatches. However, Express remains viable if microservices are long-running and community familiarity is a priority. For serverless microservices, Fastify's startup time is a critical advantage.
    language: en-US
main entity: Do I need to learn Express before Fastify?
  type: Question
  accepted answer: Answer
    text: No. While Express knowledge helps with general Node.js concepts, Fastify has its own paradigms (hooks, schema validation, plugin system) that require separate learning. Developers can learn Fastify directly; starting with Express is not a prerequisite. However, Express familiarity makes the industry job market broader since 85% of surveyed companies still use it.
    language: en-US

How to Choose Between Express.js and Fastify
type: HowTo
description: Express is a mature, widely-adopted Node.js framework with the largest ecosystem and community support, while Fastify is a newer, high-performance alternative that handles 2-3x more requests per second and includes built-in validation and serialization. Express dominates in production deployments, but Fastify excels in performance-critical applications.
language: en-US
total time: PT3M
step: Consider: Throughput Performance
step: Consider: Time to First Release
step: Consider: npm Weekly Downloads
step: Consider: Startup Time
step: Consider: Built-in Schema Validation
step: Consider: GitHub Stars
step: Consider: Production Usage (Fortune 500)
tool: A Versus B Comparison Guide
tip: HowToTip
  text: Choose Express if you need maximum community support, the largest middleware ecosystem, and working with established production systems—it remains the industry standard for web APIs. Choose Fastify if you're building new high-performance services, microservices, or serverless functions where throughput and startup time are critical, and you prefer built-in features like schema validation over external middleware.

Consider: Throughput Performance
type: HowToStep
position: 1
text: Throughput Performance: Express.js has ~15,000 req/s, while Fastify has ~30,000-40,000 req/s.

Consider: Time to First Release
type: HowToStep
position: 2
text: Time to First Release: Express.js has 2010, while Fastify has 2016.

Consider: npm Weekly Downloads
type: HowToStep
position: 3
text: npm Weekly Downloads: Express.js has ~15.8 million, while Fastify has ~1.2 million.

Consider: Startup Time
type: HowToStep
position: 4
text: Startup Time: Express.js has ~40ms, while Fastify has ~15ms.

Consider: Built-in Schema Validation
type: HowToStep
position: 5
text: Built-in Schema Validation: Express.js has No (requires middleware), while Fastify has Yes (JSON Schema native).

Consider: GitHub Stars
type: HowToStep
position: 6
text: GitHub Stars: Express.js has ~64,000, while Fastify has ~32,000.

Consider: Production Usage (Fortune 500)
type: HowToStep
position: 7
text: Production Usage (Fortune 500): Express.js has ~85% of surveyed companies, while Fastify has ~12% of surveyed companies.

claimreview
type: ClaimReview
is accessible for free: true
conditions of access: Free
claim reviewed: Express vs Fastify
review body: Express is a mature, widely-adopted Node.js framework with the largest ecosystem and community support, while Fastify is a newer, high-performance alternative that handles 2-3x more requests per second and includes built-in validation and serialization. Express dominates in production deployments, but Fastify excels in performance-critical applications.
review rating: Rating
  rating: 5
  worst rating: 1
  best rating: 5
  alternate name: Verified Comparison
author: A Versus B
item reviewed: Express vs Fastify

Auto-generated API Documentation
type: PropertyValue
value: Express.js: No (manual setup with Swagger) | Fastify: N/A

Available Packages/Libraries
type: PropertyValue
value: Express.js: ~2,300,000 (NPM) | Fastify: N/A

Async Support Quality
type: PropertyValue
value: Express.js: Promise/async-await (event loop) | Fastify: N/A

Cold Start Latency
type: PropertyValue
value: Express.js: ~80ms | Fastify: N/A

Built-in Data Validation
type: PropertyValue
value: Express.js: Not included, external libraries needed | Fastify: N/A

Native Async Support
type: PropertyValue
value: Express.js: Yes (Promises/callbacks) | Fastify: N/A

Minimum Python/Node Version
type: PropertyValue
value: Express.js: Node.js 12+ | Fastify: N/A

NPM Weekly Downloads
type: PropertyValue
value: Express.js: 28.4 million | Fastify: ~1.1M weekly downloads
value reference: Express.js

Production Deployments
type: PropertyValue
value: Express.js: 410,000+ | Fastify: N/A

Available Third-Party Packages
type: PropertyValue
value: Express.js: 10,000+ | Fastify: N/A

Release Cycle Frequency
type: PropertyValue
value: Express.js: 12-18 months | Fastify: N/A

Throughput (Requests per Second)
type: PropertyValue
value: Express.js: ~10,000 req/s | Fastify: N/A

Active Job Listings (2025)
type: PropertyValue
value: Express.js: 185,000 | Fastify: N/A

Learning Curve
type: PropertyValue
value: Express.js: 20-30 hours | Fastify: N/A

Memory Usage (Idle Instance)
type: PropertyValue
value: Express.js: ~35-50 MB | Fastify: N/A

Built-in API Documentation
type: PropertyValue
value: Express.js: No (requires Swagger, apiDoc packages) | Fastify: N/A

Native Type Validation
type: PropertyValue
value: Express.js: No (requires middleware like celebrate) | Fastify: N/A

Memory Usage (Baseline)
type: PropertyValue
value: Express.js: ~45MB | Fastify: N/A

ML/Data Science Library Support
type: PropertyValue
value: Express.js: Limited: TensorFlow.js only, requires external API calls | Fastify: N/A

GitHub Stars (Popularity Proxy)
type: PropertyValue
value: Express.js: ~64,000 stars | Fastify: N/A

Time to First Hello World
type: PropertyValue
value: Express.js: 6 lines | Fastify: N/A

Deployment Without Extra Server
type: PropertyValue
value: Express.js: Yes - runs directly with Node.js | Fastify: N/A

Bundle Size (Minified)
type: PropertyValue
value: Express.js: ~50 KB | Fastify: N/A

Middleware Packages
type: PropertyValue
value: Express.js: 3,000+ | Fastify: N/A

Year Released
type: PropertyValue
value: Express.js: 2010 | Fastify: N/A

Edge Runtime Support
type: PropertyValue
value: Express.js: Limited via adapters | Fastify: N/A

Time to First Production API
type: PropertyValue
value: Express.js: 4-8 hours | Fastify: N/A

Built-in TypeScript Support
type: PropertyValue
value: Express.js: Optional (requires setup) | Fastify: N/A

Dependency Injection Container
type: PropertyValue
value: Express.js: Not included | Fastify: N/A

Production Node.js Apps Using Framework
type: PropertyValue
value: Express.js: 68% | Fastify: N/A

Out-of-the-Box Testing Support
type: PropertyValue
value: Express.js: None (requires external libraries) | Fastify: N/A

Middleware Ecosystem Size
type: PropertyValue
value: Express.js: 300,000+ | Fastify: N/A

Requests Per Second
type: PropertyValue
value: Express.js: 8,000-12,000 req/sec | Fastify: N/A

Memory Footprint
type: PropertyValue
value: Express.js: 50-100 MB | Fastify: N/A

Average Learning Time
type: PropertyValue
value: Express.js: 5-7 days for JS developers | Fastify: N/A

Time to Deploy Hello World
type: PropertyValue
value: Express.js: 2 minutes | Fastify: N/A

Production Usage (2024 Survey)
type: PropertyValue
value: Express.js: 32% of Node.js projects | Fastify: N/A

Latency (p95)
type: PropertyValue
value: Express.js: 45-60 ms | Fastify: N/A

Request Throughput (Requests/Second)
type: PropertyValue
value: Express.js: ~8,000 req/sec | Fastify: N/A

Memory Footprint (Baseline)
type: PropertyValue
value: Express.js: 40-60 MB | Fastify: N/A

Startup Time
type: PropertyValue
value: Express.js: ~400-600 ms | Fastify: ~15
value reference: Fastify

Deployment Binary Size
type: PropertyValue
value: Express.js: ~40-100 MB (with node_modules) | Fastify: N/A

Concurrent Connection Handling
type: PropertyValue
value: Express.js: ~10,000 per instance | Fastify: N/A

Requests Per Second (1KB payload)
type: PropertyValue
value: Express.js: ~32,000 | Fastify: N/A

Auto-Generated API Docs
type: PropertyValue
value: Express.js: No | Fastify: N/A

NPM/PyPI Weekly Downloads
type: PropertyValue
value: Express.js: ~20M+ (NPM/week) | Fastify: N/A

Response Latency (p99)
type: PropertyValue
value: Express.js: 45-55ms | Fastify: N/A

Time to Build Hello World API
type: PropertyValue
value: Express.js: 5-10 minutes | Fastify: N/A

Available Packages/Modules
type: PropertyValue
value: Express.js: 2.3M packages | Fastify: N/A

Automatic API Documentation
type: PropertyValue
value: Express.js: Manual setup required | Fastify: N/A

Weekly NPM/PyPI Downloads
type: PropertyValue
value: Express.js: 18M+ weekly downloads | Fastify: N/A

Core Package Size
type: PropertyValue
value: Express.js: ~250 KB | Fastify: N/A

Available Middleware Packages
type: PropertyValue
value: Express.js: 3,000+ | Fastify: N/A

Enterprise Production Adoption
type: PropertyValue
value: Express.js: 68% | Fastify: N/A

StackOverflow Questions
type: PropertyValue
value: Express.js: 18,000+ | Fastify: N/A

Async/Await Native Support
type: PropertyValue
value: Express.js: Requires wrapper middleware (co, async-await-handler) | Fastify: N/A

Years in Production
type: PropertyValue
value: Express.js: 12+ years (released 2010) | Fastify: N/A

HTTP Throughput (Requests/sec)
type: PropertyValue
value: Express.js: N/A | Fastify: ~40,000 req/s

Setup Time (Hello World)
type: PropertyValue
value: Express.js: N/A | Fastify: 2-3 minutes

Built-in Validation
type: PropertyValue
value: Express.js: N/A | Fastify: Plugin required (@fastify/ajv-compiler)

TypeScript Setup Difficulty
type: PropertyValue
value: Express.js: N/A | Fastify: Manual tsconfig + compilation setup

Enterprise Adoption Rate
type: PropertyValue
value: Express.js: N/A | Fastify: 12% of surveyed enterprise Node teams

Raw Throughput
type: PropertyValue
value: Express.js: N/A | Fastify: ~45,000 req/sec

Latency (p99)
type: PropertyValue
value: Express.js: N/A | Fastify: 12ms

Bundle Size (Gzipped)
type: PropertyValue
value: Express.js: N/A | Fastify: ~180KB

Time to Hello World
type: PropertyValue
value: Express.js: N/A | Fastify: ~10 minutes

Official Module Ecosystem
type: PropertyValue
value: Express.js: N/A | Fastify: 15+ official plugins

TypeScript-First Support
type: PropertyValue
value: Express.js: N/A | Fastify: Optional, works with JavaScript

Built-in Dependency Injection
type: PropertyValue
value: Express.js: N/A | Fastify: No (manual or third-party)

Response Latency (Average)
type: PropertyValue
value: Express.js: N/A | Fastify: ~4-6ms

TypeScript Support
type: PropertyValue
value: Express.js: N/A | Fastify: Official built-in types

SpeakableSpecification
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Express.js — Wikipedia
type: CreativeWork

Fastify — Wikipedia
type: CreativeWork

Compare Express.js vs Fastify
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target: https://www.aversusb.net/compare/express-vs-fastify))
object: Express.js
object: Fastify

Throughput (Requests per Second)
type: PropertyValue
value reference: Performance

Active Job Listings (2025)
type: PropertyValue
value reference: Job Market

Learning Curve
type: PropertyValue
value reference: Usability

Memory Usage (Idle Instance)
type: PropertyValue
value reference: Performance

Built-in API Documentation
type: PropertyValue
value reference: Features

Native Type Validation
type: PropertyValue
value reference: Features

Memory Usage (Baseline)
type: PropertyValue
value reference: Performance

ML/Data Science Library Support
type: PropertyValue
value reference: Ecosystem

GitHub Stars (Popularity Proxy)
type: PropertyValue
value reference: Community

Time to First Hello World
type: PropertyValue
value reference: Ease of Use

Deployment Without Extra Server
type: PropertyValue
value reference: DevOps

Bundle Size (Minified)
type: PropertyValue
value reference: Performance

Middleware Packages
type: PropertyValue
value reference: Ecosystem

Year Released
type: PropertyValue
value reference: Maturity

Edge Runtime Support
type: PropertyValue
value reference: Platform Support

Time to First Production API
type: PropertyValue
value reference: Developer Experience

Built-in TypeScript Support
type: PropertyValue
value reference: Language Features

Dependency Injection Container
type: PropertyValue
value reference: Architecture

Production Node.js Apps Using Framework
type: PropertyValue
value reference: Adoption

Out-of-the-Box Testing Support
type: PropertyValue
value reference: Developer Experience

Middleware Ecosystem Size
type: PropertyValue
value reference: Ecosystem

Requests Per Second
type: PropertyValue
value reference: Performance

Memory Footprint
type: PropertyValue
value reference: Performance

Average Learning Time
type: PropertyValue
value reference: Developer Experience

Time to Deploy Hello World
type: PropertyValue
value reference: Developer Experience

Production Usage (2024 Survey)
type: PropertyValue
value reference: Market

Latency (p95)
type: PropertyValue
value reference: Performance

Request Throughput (Requests/Second)
type: PropertyValue
value reference: Performance

Memory Footprint (Baseline)
type: PropertyValue
value reference: Performance

Startup Time
type: PropertyValue
value reference: Performance

Deployment Binary Size
type: PropertyValue
value reference: Deployment

Concurrent Connection Handling
type: PropertyValue
value reference: Performance

Requests Per Second (1KB payload)
type: PropertyValue
value reference: Performance

Auto-Generated API Docs
type: PropertyValue
value reference: Features

NPM/PyPI Weekly Downloads
type: PropertyValue
value reference: Adoption

Response Latency (p99)
type: PropertyValue
value reference: Performance

Time to Build Hello World API
type: PropertyValue
value reference: Developer Experience

Available Packages/Modules
type: PropertyValue
value reference: Ecosystem

Automatic API Documentation
type: PropertyValue
value reference: Developer Experience

Weekly NPM/PyPI Downloads
type: PropertyValue
value reference: Community

Core Package Size
type: PropertyValue
value reference: Performance & Size

Available Middleware Packages
type: PropertyValue
value reference: Ecosystem

Enterprise Production Adoption
type: PropertyValue
value reference: Production Use

StackOverflow Questions
type: PropertyValue
value reference: Community Support

Async/Await Native Support
type: PropertyValue
value reference: Architecture

Years in Production
type: PropertyValue
value reference: Maturity

HTTP Throughput (Requests/sec)
type: PropertyValue
value reference: Performance

Setup Time (Hello World)
type: PropertyValue
value reference: Developer Experience

Built-in Validation
type: PropertyValue
value reference: Features

TypeScript Setup Difficulty
type: PropertyValue
value reference: Development

Enterprise Adoption Rate
type: PropertyValue
value reference: Industry Adoption

Raw Throughput
type: PropertyValue
value reference: Performance

Latency (p99)
type: PropertyValue
value reference: Performance

Bundle Size (Gzipped)
type: PropertyValue
value reference: Performance

Time to Hello World
type: PropertyValue
value reference: Development Experience

Official Module Ecosystem
type: PropertyValue
value reference: Ecosystem

TypeScript-First Support
type: PropertyValue
value reference: Language Support

Built-in Dependency Injection
type: PropertyValue
value reference: Architecture

Response Latency (Average)
type: PropertyValue
value reference: Performance

TypeScript Support
type: PropertyValue
value reference: Language Features