software
Express vs FastAPI 2026: Performance & Features
Express is a mature Node.js web framework with the largest ecosystem and easiest learning curve, while FastAPI is a modern Python framework offering 3.5x faster performance, automatic API documentation, and built-in async support. Choose Express for maximum flexibility and community libraries; choose FastAPI for speed and developer productivity.
E
Express.js
Mature, minimalist Node.js web framework with largest middleware ecosystem and production adoption.
Teams with JavaScript expertise, real-time applications, full-stack projects, companies needing maximum ecosystem flexibility and library choices.
Score63%
VS
F
FastAPI
Modern async-first Python framework for building high-performance APIs
Startups prioritizing speed-to-market, data science teams, microservices, high-performance APIs, teams preferring Python's readability and scientific libraries.
Score63%
Quick Answer
AI SummaryExpress is a mature Node.js web framework with the largest ecosystem and easiest learning curve, while FastAPI is a modern Python framework offering 3.5x faster performance, automatic API documentation, and built-in async support. Choose Express for maximum flexibility and community libraries; choose FastAPI for speed and developer productivity.
Our Verdict
AI-assistedChoose Express if you need maximum ecosystem flexibility, have JavaScript expertise, or require extensive middleware libraries for complex use cases like real-time applications. Choose FastAPI if performance is critical, you want rapid API development with minimal boilerplate, automatic documentation, or prefer Python's readability and scientific computing libraries.
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E
Express.js
8.3/10
FastAPI
6.7/10
F
E
Choose Express.js if
Best pickTeams with JavaScript expertise, real-time applications, full-stack projects, companies needing maximum ecosystem flexibility and library choices.
F
Choose FastAPI if
Startups prioritizing speed-to-market, data science teams, microservices, high-performance APIs, teams preferring Python's readability and scientific libraries.
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Key Differences at a Glance
- Language & Runtime:JavaScript/Node.js vs Python 3.6+
- Requests Per Second (benchmark):✓ FastAPI wins(~28,000 req/s vs ~8,000 req/s)
- Time to First API (minutes):✓ FastAPI wins(2-3 minutes vs 5-10 minutes)
Key Facts & Figures
120 numeric metrics compared
| Metric | Express.js | FastAPI | Ratio |
|---|---|---|---|
| Application Startup Time(milliseconds) | ~40ms | 150ms (average) | |
| Initial Release Year(year) | 2010 | 2018 | |
| Production Fortune 500 Adoption(percent) | ~85% | — | — |
| Cold Start Time(ms) | ~120 ms | 300ms | |
| Base Framework Size(megabytes) | 0.05 MB | — | — |
| Requests/Second (Throughput)(req/s) | ~3,500 req/s | — | — |
| Learning Time to Proficiency(hours) | 25 hours | — | — |
| Community Size (GitHub Stars)(stars) | 65k stars | — | — |
| Development Speed (Median Project Timeline)(weeks) | 10-16 weeks | — | — |
| Throughput (Requests/Second)(req/sec) | ~4,500 req/s | 8,000-12,000 | |
| Latency (p99 response time)(ms) | 25-40 ms | 8-12 ms | |
| Package Ecosystem Size(packages) | 2.7M+ (npm) | 500,000+ (PyPI) | |
| GitHub Stars(stars) | 64,000+ | 75,000+ stars | |
| Production Adoption Rate(percent) | ~85% | 22% (Stack Overflow 2024) | |
| First Release Year | 2010 | 2018 | |
| Requests Per Second (Throughput)(req/s) | ~8,000 req/s | ~28,000 req/s | |
| Time to First API Endpoint(minutes) | 15 minutes | ~5 minutes | |
| Memory Usage (Idle)(MB) | ~55 MB per instance | 50-100MB | |
| Cold Start Time (Serverless)(ms) | ~300 ms | — | — |
| GitHub Stars (Community)(stars) | 64,000+ stars | — | — |
| Weekly NPM Downloads(downloads) | 16.2 million | ~1.2M (PyPI: ~2.8M) | |
| Minimal App Bundle Size(kilobytes) | ~50KB | — | — |
| Supported Runtimes(count) | Node.js only | — | — |
| Stack Overflow Questions(questions) | 500,000+ | ~30,000 questions | |
| Request Throughput(requests/second) | ~8,000 req/s | 22,000-25,000 req/s | |
| Average Response Latency(seconds) | 47.5 | — | — |
| Available Plugins/Middleware(count) | 10,000+ | — | — |
| Idle Memory Usage(MB) | 47.5 | 50-80 | |
| Time to Basic Productivity(hours) | 10 | 4-8 hours | |
| Minified Bundle Size(KB) | 50.3 KB | — | — |
| Stack Overflow Questions (all-time)(count) | 100,000+ | — | — |
| Requests Per Second (RPS) Throughput(req/sec) | 8,000-12,000 | — | — |
| Baseline Memory Usage(MB) | 80-120 | — | — |
| Weekly Package Downloads(downloads) | ~20,000,000 (npm) | ~450,000 (PyPI) | |
| Production Longevity(years) | 15 years (since 2010) | — | — |
| HTTP Request Latency (p99)(milliseconds) | 40-80 | — | — |
| Core Library Size(kilobytes) | 52KB | 1,200KB (with uvicorn) | |
| Available Packages/Libraries(count) | ~2,300,000 (NPM) | ~500,000 (PyPI) | |
| Cold Start Latency(milliseconds) | ~80ms | 300ms | |
| NPM Weekly Downloads(downloads) | 28.4 million | 2.5M weekly | |
| Production Deployments(organizations) | 410,000+ | ~400K active | |
| Available Third-Party Packages(packages) | 10,000+ | — | — |
| Release Cycle Frequency(months between major versions) | 12-18 months | — | — |
| Throughput (Requests per Second)(req/s) | ~10,000 req/s | ~12,000 req/s | |
| Active Job Listings (2025)(positions) | 185,000 | 42,000 | |
| Memory Usage (Idle Instance)(MB) | ~35-50 MB | ~80-120 MB | |
| Memory Usage (Baseline)(MB) | ~45MB | — | — |
| GitHub Stars (Popularity Proxy)(stars) | ~64,000 stars | — | — |
| Time to First Hello World(lines of code) | 6 lines | — | — |
| Bundle Size (Minified)(KB) | ~50 KB | — | — |
| Middleware Packages(count) | 3,000+ | — | — |
| Year Released | 2010 | — | — |
| Time to First Production API(hours) | 4-8 hours | — | — |
| Production Node.js Apps Using Framework(%) | 68% | — | — |
| Middleware Ecosystem Size(packages) | 300,000+ | — | — |
| Requests Per Second(req/sec) | 8,000-12,000 req/sec | — | — |
| Memory Footprint(MB) | 50-100 MB | — | — |
| Average Learning Time(days) | 5-7 days for JS developers | — | — |
| Time to Deploy Hello World(minutes) | 2 minutes | — | — |
| Production Usage (2024 Survey)(% adoption) | 32% of Node.js projects | — | — |
| Latency (p95)(ms) | 45-60 ms | — | — |
| Request Throughput (Requests/Second)(req/sec) | ~8,000 req/sec | — | — |
| Memory Footprint (Baseline)(MB) | 40-60 MB | — | — |
| Startup Time(seconds) | ~400-600 ms | 250-500ms | |
| Deployment Binary Size(MB) | ~40-100 MB (with node_modules) | — | — |
| Concurrent Connection Handling(connections) | ~10,000 per instance | — | — |
| Requests Per Second (1KB payload)(req/s) | ~32,000 | ~28,000 | |
| NPM/PyPI Weekly Downloads(weekly downloads) | ~20M+ (NPM/week) | ~2.8M (PyPI/month) | |
| Response Latency (p99)(milliseconds) | 45-55ms | 8-12ms | |
| Time to Build Hello World API(minutes) | 5-10 minutes | 2-3 minutes | |
| Available Packages/Modules(count (millions)) | 2.3M packages | 500K packages | |
| Weekly NPM/PyPI Downloads(downloads (millions)) | 18M+ weekly downloads | 2.5M+ weekly downloads | |
| Core Package Size(KB) | ~250 KB | — | — |
| Available Middleware Packages(packages) | 3,000+ | — | — |
| Enterprise Production Adoption(% of Fortune 500) | 68% | — | — |
| StackOverflow Questions(questions) | 18,000+ | — | — |
| Years in Production(years) | 12+ years (released 2010) | — | — |
| Time to First API (Learning Curve)(hours) | 15-25 hours | 15-25 hours | |
| Core Framework Size(KB) | ~300 KB | ~300 KB | |
| Time Since Initial Release(years) | 4 years (2021) | 4 years (2021) | |
| Memory Usage (base)(MB) | ~10MB | ~10MB | |
| Third-party Packages(packages) | 2,000+ packages | 2,000+ packages | |
| Related Packages (PyPI)(packages) | ~2,100 | ~2,100 | |
| Framework Requests Per Second(req/s) | 10,000 | 10,000 | |
| Python/Go Package Ecosystem Size(packages) | 400,000+ | 400,000+ | |
| Time to Production (Small API)(hours) | 4-8 | 4-8 | |
| Package Size(MB) | ~100 KB | ~100 KB | |
| Average Latency (Hello World)(ms) | ~85 ms | ~85 ms | |
| PyPI Weekly Downloads(downloads) | ~2.8M (Jan 2026) | ~2.8M (Jan 2026) | |
| Time to Hello World API(minutes) | ~5 minutes | ~5 minutes | |
| Throughput Performance(requests/second) | ~15,000 req/s | ~15,000 req/s | |
| Memory Usage (Hello World)(MB) | ~40 MB | ~40 MB | |
| Throughput Benchmark (requests/sec)(req/s) | ~18,000 req/s | ~18,000 req/s | |
| Time to Build Basic CRUD App(minutes) | 3.5 hours (manual setup required) | 3.5 hours (manual setup required) | |
| Ecosystem Size (package repositories)(packages) | ~480,000 packages (PyPI) | ~480,000 packages (PyPI) | |
| Third-Party Extensions Available(plugins) | ~2,500 extensions | ~2,500 extensions | |
| Performance - Request Throughput(requests/sec) | ~15,000-18,000 req/sec | ~15,000-18,000 req/sec | |
| Production Maturity(years) | 7 years | 7 years | |
| P99 Latency (typical)(ms) | 150-250 | 150-250 | |
| Peak Throughput (Req/s)(requests per second) | ~10,000 req/s | ~10,000 req/s | |
| Memory Usage per Process(MB) | ~40 MB | ~40 MB | |
| Community Library Ecosystem(total packages) | 500,000+ PyPI packages (Python ecosystem) | 500,000+ PyPI packages (Python ecosystem) | |
| Job Market Postings (2026)(active positions) | ~12,000 positions | ~12,000 positions | |
| Framework Maturity(years) | 6 years (released 2018) | 6 years (released 2018) | |
| Minimum Memory Footprint(GB) | 40MB | 40MB | |
| GitHub Stars (as of 2026)(stars) | 68,000+ stars | 68,000+ stars | |
| Time to Production Hello World(minutes) | 5 minutes | 5 minutes | |
| Built-in Features Count(features) | 12 core features | 12 core features | |
| Production Applications (market estimate)(thousands) | 45,000+ apps | 45,000+ apps | |
| Requests Per Second (Single Instance)(req/s) | ~7,500 req/s | ~7,500 req/s | |
| Memory Footprint Per Process(MB) | ~15 MB | ~15 MB | |
| Time to Basic API (Hello World)(lines of code) | ~5 lines | ~5 lines | |
| Ecosystem Size (Packages)(packages) | ~350,000 PyPI packages (FastAPI-specific: ~4,000) | ~350,000 PyPI packages (FastAPI-specific: ~4,000) | |
| Default Dependencies(count) | 6 (starlette, pydantic, etc.) | 6 (starlette, pydantic, etc.) | |
| Time to 'Hello World' App(lines of code) | 8-10 lines | 8-10 lines | |
| Lines of Code for Basic Endpoint(lines) | 5-8 lines | 5-8 lines | |
| GitHub Stars (2026)(stars) | ~75,000 stars | ~75,000 stars | |
| Development Time (basic API)(hours) | 20-30 hours | 20-30 hours | |
| Ecosystem Size(packages) | 8,000+ packages | 8,000+ packages | |
| Framework Age(years) | 5 years (since 2018) | 5 years (since 2018) |
Sourced from publicly available data ·
Key Differences
7 attributes compared head-to-head
E
1Express.jsFastAPI leads1 tie
F
5FastAPIExpress.js
Attribute
FastAPI
- JavaScript/Node.jsLanguage & RuntimePython 3.6+
- ~8,000 req/sRequests Per Second (benchmark)~28,000 req/s(winner)
- 5-10 minutesTime to First API (minutes)2-3 minutes(winner)
- 2.3M+ packages(winner)NPM/PyPI Packages Available500K+ packages
- Manual (Swagger/OpenAPI required)Automatic API DocumentationBuilt-in (Swagger UI + ReDoc)(winner)
- Manual or external librariesData ValidationBuilt-in with Pydantic models(winner)
- 65,000+ starsGitHub Stars (2026)75,000+ stars(winner)
- Language & Runtime
Express.js
JavaScript/Node.js
FastAPI
Python 3.6+
- Requests Per Second (benchmark)
Express.js
~8,000 req/s
FastAPI
~28,000 req/s(winner)
- Time to First API (minutes)
Express.js
5-10 minutes
FastAPI
2-3 minutes(winner)
- NPM/PyPI Packages Available
Express.js
2.3M+ packages(winner)
FastAPI
500K+ packages
- Automatic API Documentation
Express.js
Manual (Swagger/OpenAPI required)
FastAPI
Built-in (Swagger UI + ReDoc)(winner)
- Data Validation
Express.js
Manual or external libraries
FastAPI
Built-in with Pydantic models(winner)
- GitHub Stars (2026)
Express.js
65,000+ stars
FastAPI
75,000+ stars(winner)
Full Comparison
| Attribute | Express.js | FastAPI |
|---|---|---|
| Application Startup Time(milliseconds) | ~40ms(winner) | 150ms (average) |
| Cold Start Time(ms) | ~120 ms(winner) | 300ms |
| Requests/Second (Throughput)(req/s) | ~3,500 req/s | — |
| Throughput (Requests/Second)(req/sec) | ~4,500 req/s | 8,000-12,000(winner) |
| Latency (p99 response time)(ms) | 25-40 ms | 8-12 ms(winner) |
Show 34 more attributesRequests Per Second (Throughput)(req/s) ~8,000 req/s ~28,000 req/s Minimal App Bundle Size(kilobytes) ~50KB — Request Throughput(requests/second) ~8,000 req/s 22,000-25,000 req/s Average Response Latency(seconds) 47.5 — Idle Memory Usage(MB) 47.5 50-80 Minified Bundle Size(KB) 50.3 KB — Requests Per Second (RPS) Throughput(req/sec) 8,000-12,000 — Baseline Memory Usage(MB) 80-120 — HTTP Request Latency (p99)(milliseconds) 40-80 — Cold Start Latency(milliseconds) ~80ms 300ms Throughput (Requests per Second)(req/s) ~10,000 req/s ~12,000 req/s Memory Usage (Idle Instance)(MB) ~35-50 MB ~80-120 MB Memory Usage (Baseline)(MB) ~45MB — Bundle Size (Minified)(KB) ~50 KB — Requests Per Second(req/sec) 8,000-12,000 req/sec — Memory Footprint(MB) 50-100 MB — Latency (p95)(ms) 45-60 ms — Request Throughput (Requests/Second)(req/sec) ~8,000 req/sec — Memory Footprint (Baseline)(MB) 40-60 MB — Startup Time(seconds) ~400-600 ms 250-500ms Concurrent Connection Handling(connections) ~10,000 per instance — Requests Per Second (1KB payload)(req/s) ~32,000 ~28,000 Response Latency (p99)(milliseconds) 45-55ms 8-12ms Memory Usage (base)(MB) ~10MB — Framework Requests Per Second(req/s) 10,000 — Average Latency (Hello World)(ms) ~85 ms — Throughput Performance(requests/second) ~15,000 req/s — Memory Usage (Hello World)(MB) ~40 MB — Throughput Benchmark (requests/sec)(req/s) ~18,000 req/s — Performance - Request Throughput(requests/sec) ~15,000-18,000 req/sec — P99 Latency (typical)(ms) 150-250 — Peak Throughput (Req/s)(requests per second) ~10,000 req/s — Requests Per Second (Single Instance)(req/s) ~7,500 req/s — Memory Footprint Per Process(MB) ~15 MB — | ||
| Initial Release Year(year) | 2010(winner) | 2018 |
| Built-in Schema Validation | No (requires middleware) | — |
| Built-in ORM | None (third-party required) | No (requires external library) |
| Auto API Documentation | Manual (requires express-swagger-jsdoc or similar) | Native (Swagger UI + ReDoc built-in) |
| WebSocket Support | Native Socket.io integration | — |
| Data Science Library Integration | Requires Node bindings/bridges | — |
Show 10 more attributesNative Async/Await Support Partial (middleware adapters needed) Native first-class support Auto-generated API Documentation No (manual setup with Swagger) Yes (automatic) Built-in API Documentation No (requires Swagger, apiDoc packages) Yes (Swagger UI + ReDoc automatic) Native Type Validation No (requires middleware like celebrate) Yes (Pydantic built-in) Auto-Generated API Docs No Yes (Swagger/ReDoc) Built-in Admin Dashboard No, requires build — Async Request Support Full native support — Built-in Authentication No (requires FastAPI-Users, python-jose) — Database ORM Included No (requires SQLAlchemy, Tortoise-ORM) — Built-in Admin Interface No, manual setup required — | ||
| Production Fortune 500 Adoption(percent) | ~85% | — |
| Production Maturity(years) | 7 years | — |
| Available Middleware/Plugins(ecosystem size) | 10,000+ third-party packages | — |
| Package Ecosystem Size(packages) | 2.7M+ (npm)(winner) | 500,000+ (PyPI) |
| Available Plugins/Middleware(count) | 10,000+ | — |
| Weekly Package Downloads(downloads) | ~20,000,000 (npm)(winner) | ~450,000 (PyPI) |
| Available Packages/Libraries(count) | ~2,300,000 (NPM)(winner) | ~500,000 (PyPI) |
Show 13 more attributesAvailable Third-Party Packages(packages) 10,000+ — ML/Data Science Library Support(text) Limited: TensorFlow.js only, requires external API calls — Middleware Packages(count) 3,000+ — Middleware Ecosystem Size(packages) 300,000+ — Available Packages/Modules(count (millions)) 2.3M packages 500K packages Available Middleware Packages(packages) 3,000+ — Third-party Packages(packages) 2,000+ packages — Related Packages (PyPI)(packages) ~2,100 — Python/Go Package Ecosystem Size(packages) 400,000+ — Ecosystem Size (package repositories)(packages) ~480,000 packages (PyPI) — Community Library Ecosystem(total packages) 500,000+ PyPI packages (Python ecosystem) — Ecosystem Size (Packages)(packages) ~350,000 PyPI packages (FastAPI-specific: ~4,000) — Ecosystem Size(packages) 8,000+ packages — | ||
| Base Framework Size(megabytes) | 0.05 MB | — |
| Admin Panel | Third-party package required | — |
| Learning Time to Proficiency(hours) | 25 hours | — |
| Learning Curve(difficulty rating) | 20-30 hours(winner) | 30-40 hours |
| Time to First API (Learning Curve)(hours) | 15-25 hours | — |
| Learning Curve Difficulty | Moderate (3.5/5) | — |
| Community Size (GitHub Stars)(stars) | 65k stars | — |
| GitHub Stars(stars) | 64,000+ | 75,000+ stars(winner) |
| GitHub Stars (Community)(stars) | 64,000+ stars | — |
| Stack Overflow Questions(questions) | 500,000+(winner) | ~30,000 questions |
| Stack Overflow Questions (all-time)(count) | 100,000+ | — |
Show 4 more attributesGitHub Stars (Popularity Proxy)(stars) ~64,000 stars — Weekly NPM/PyPI Downloads(downloads (millions)) 18M+ weekly downloads 2.5M+ weekly downloads GitHub Stars (as of 2026)(stars) 68,000+ stars — GitHub Stars (2026)(stars) ~75,000 stars — | ||
| Development Speed (Median Project Timeline)(weeks) | 10-16 weeks | — |
| Type Safety Support | Optional (TypeScript) | Native (Python type hints) |
| Native TypeScript Support | Via @types/express | — |
| Built-in Request Validation | No | Yes (Pydantic) |
| Built-in Data Validation | Not included, external libraries needed | Built-in with Pydantic |
Show 15 more attributesTime to First Production API(hours) 4-8 hours — Out-of-the-Box Testing Support None (requires external libraries) — Average Learning Time(days) 5-7 days for JS developers — Time to Deploy Hello World(minutes) 2 minutes — Time to Build Hello World API(minutes) 5-10 minutes 2-3 minutes Automatic API Documentation Manual setup required Built-in (OpenAPI/Swagger) Auto-Documentation Support Built-in (OpenAPI 3.0) — Built-in Documentation Generation Automatic (Swagger UI + ReDoc) — Time to Hello World API(minutes) ~5 minutes — Built-in Validation Framework Pydantic (integrated) — Built-in Features Count(features) 12 core features — Type Hint Support Full (enforced) — Auto Documentation Generation Automatic (Swagger UI + ReDoc) — Time to 'Hello World' App(lines of code) 8-10 lines — Development Time (basic API)(hours) 20-30 hours — | ||
| Production Adoption Rate(percent) | ~85%(winner) | 22% (Stack Overflow 2024) |
| First Release Year | 2010 | 2018 |
| Production Longevity(years) | 15 years (since 2010) | — |
| Year Released | 2010 | — |
| Years in Production(years) | 12+ years (released 2010) | — |
| Time Since Initial Release(years) | 4 years (2021) | — |
Show 1 more attributeFramework Age(years) 5 years (since 2018) — | ||
| Time to First API Endpoint(minutes) | 15 minutes | ~5 minutes(winner) |
| Time to Production (Small API)(hours) | 4-8 | — |
| Time to Production Hello World(minutes) | 5 minutes | — |
| Time to Basic API (Hello World)(lines of code) | ~5 lines | — |
| Memory Usage (Idle)(MB) | ~55 MB per instance(winner) | 50-100MB |
| Cold Start Time (Serverless)(ms) | ~300 ms | — |
| Weekly NPM Downloads(downloads) | 16.2 million(winner) | ~1.2M (PyPI: ~2.8M) |
| Supported Runtimes(count) | Node.js only | — |
| Python Version Support(versions) | 3.7+ | — |
| Time to Basic Productivity(hours) | 10 | 4-8 hours(winner) |
| Middleware Architecture Pattern | Callback-based (req, res, next) | — |
| Core Library Size(kilobytes) | 52KB(winner) | 1,200KB (with uvicorn) |
| Async Support Quality | Promise/async-await (event loop) | Native async/await with asyncio |
| Native Async Support | Yes (Promises/callbacks) | Full (async-first) |
| Dependency Injection Container | Not included | — |
| Async/Await Native Support | Requires wrapper middleware (co, async-await-handler) | Yes, built-in by default |
| Deployment Model | Requires app server (Uvicorn) | — |
Show 3 more attributesBuilt-in Dependency Injection(feature availability) Manual setup required — Framework Type High-level API framework (built on Starlette) — Async Support Native async/await built-in — | ||
| Minimum Python/Node Version | Node.js 12+ | Python 3.7+ |
| Minimum Python Version(version) | Python 3.6+ | — |
| NPM Weekly Downloads(downloads) | 28.4 million(winner) | 2.5M weekly |
| Production Deployments(organizations) | 410,000+(winner) | ~400K active |
| Production Node.js Apps Using Framework(%) | 68% | — |
| NPM/PyPI Weekly Downloads(weekly downloads) | ~20M+ (NPM/week)(winner) | ~2.8M (PyPI/month) |
| PyPI Weekly Downloads(downloads) | ~2.8M (Jan 2026) | — |
Show 1 more attributeProduction Applications (market estimate)(thousands) 45,000+ apps — | ||
| Release Cycle Frequency(months between major versions) | 12-18 months | — |
| Active Job Listings (2025)(positions) | 185,000(winner) | 42,000 |
| Time to First Hello World(lines of code) | 6 lines | — |
| Deployment Without Extra Server(text) | Yes - runs directly with Node.js | — |
| Edge Runtime Support | Limited via adapters | — |
| Built-in TypeScript Support | Optional (requires setup) | — |
| Production Usage (2024 Survey)(% adoption) | 32% of Node.js projects | — |
| Deployment Binary Size(MB) | ~40-100 MB (with node_modules) | — |
| Production Readiness Without External Server | Requires ASGI (Uvicorn) | — |
| Core Package Size(KB) | ~250 KB | — |
| Enterprise Production Adoption(% of Fortune 500) | 68% | — |
| StackOverflow Questions(questions) | 18,000+ | — |
| Core Framework Size(KB) | ~300 KB | — |
| Package Size(MB) | ~100 KB | — |
| Default Dependencies(count) | 6 (starlette, pydantic, etc.) | — |
| Time to Build Basic CRUD App(minutes) | 3.5 hours (manual setup required) | — |
| Lines of Code for Basic Endpoint(lines) | 5-8 lines | — |
| Async-First Support | Native, default behavior | — |
| Third-Party Extensions Available(plugins) | ~2,500 extensions | — |
| Memory Usage per Process(MB) | ~40 MB | — |
| Minimum Memory Footprint(GB) | 40MB | — |
| Job Market Postings (2026)(active positions) | ~12,000 positions | — |
| Framework Maturity(years) | 6 years (released 2018) | — |
EExpress.js
FFastAPI
Application Startup Time(milliseconds)
~40ms
150ms (average)
Cold Start Time(ms)
~120 ms
300ms
Requests/Second (Throughput)(req/s)
~3,500 req/s
—
Throughput (Requests/Second)(req/sec)
~4,500 req/s
8,000-12,000
Latency (p99 response time)(ms)
25-40 ms
8-12 ms
Show 34 more attributes
Requests Per Second (Throughput)(req/s)
~8,000 req/s
~28,000 req/s
Minimal App Bundle Size(kilobytes)
~50KB
—
Request Throughput(requests/second)
~8,000 req/s
22,000-25,000 req/s
Average Response Latency(seconds)
47.5
—
Idle Memory Usage(MB)
47.5
50-80
Minified Bundle Size(KB)
50.3 KB
—
Requests Per Second (RPS) Throughput(req/sec)
8,000-12,000
—
Baseline Memory Usage(MB)
80-120
—
HTTP Request Latency (p99)(milliseconds)
40-80
—
Cold Start Latency(milliseconds)
~80ms
300ms
Throughput (Requests per Second)(req/s)
~10,000 req/s
~12,000 req/s
Memory Usage (Idle Instance)(MB)
~35-50 MB
~80-120 MB
Memory Usage (Baseline)(MB)
~45MB
—
Bundle Size (Minified)(KB)
~50 KB
—
Requests Per Second(req/sec)
8,000-12,000 req/sec
—
Memory Footprint(MB)
50-100 MB
—
Latency (p95)(ms)
45-60 ms
—
Request Throughput (Requests/Second)(req/sec)
~8,000 req/sec
—
Memory Footprint (Baseline)(MB)
40-60 MB
—
Startup Time(seconds)
~400-600 ms
250-500ms
Concurrent Connection Handling(connections)
~10,000 per instance
—
Requests Per Second (1KB payload)(req/s)
~32,000
~28,000
Response Latency (p99)(milliseconds)
45-55ms
8-12ms
Memory Usage (base)(MB)
~10MB
—
Framework Requests Per Second(req/s)
10,000
—
Average Latency (Hello World)(ms)
~85 ms
—
Throughput Performance(requests/second)
~15,000 req/s
—
Memory Usage (Hello World)(MB)
~40 MB
—
Throughput Benchmark (requests/sec)(req/s)
~18,000 req/s
—
Performance - Request Throughput(requests/sec)
~15,000-18,000 req/sec
—
P99 Latency (typical)(ms)
150-250
—
Peak Throughput (Req/s)(requests per second)
~10,000 req/s
—
Requests Per Second (Single Instance)(req/s)
~7,500 req/s
—
Memory Footprint Per Process(MB)
~15 MB
—
Initial Release Year(year)
2010
2018
Built-in Schema Validation
No (requires middleware)
—
Built-in ORM
None (third-party required)
No (requires external library)
Auto API Documentation
Manual (requires express-swagger-jsdoc or similar)
Native (Swagger UI + ReDoc built-in)
WebSocket Support
Native Socket.io integration
—
Data Science Library Integration
Requires Node bindings/bridges
—
Show 10 more attributes
Native Async/Await Support
Partial (middleware adapters needed)
Native first-class support
Auto-generated API Documentation
No (manual setup with Swagger)
Yes (automatic)
Built-in API Documentation
No (requires Swagger, apiDoc packages)
Yes (Swagger UI + ReDoc automatic)
Native Type Validation
No (requires middleware like celebrate)
Yes (Pydantic built-in)
Auto-Generated API Docs
No
Yes (Swagger/ReDoc)
Built-in Admin Dashboard
No, requires build
—
Async Request Support
Full native support
—
Built-in Authentication
No (requires FastAPI-Users, python-jose)
—
Database ORM Included
No (requires SQLAlchemy, Tortoise-ORM)
—
Built-in Admin Interface
No, manual setup required
—
Production Fortune 500 Adoption(percent)
~85%
—
Production Maturity(years)
7 years
—
Available Middleware/Plugins(ecosystem size)
10,000+ third-party packages
—
Package Ecosystem Size(packages)
2.7M+ (npm)
500,000+ (PyPI)
Available Plugins/Middleware(count)
10,000+
—
Weekly Package Downloads(downloads)
~20,000,000 (npm)
~450,000 (PyPI)
Available Packages/Libraries(count)
~2,300,000 (NPM)
~500,000 (PyPI)
Show 13 more attributes
Available Third-Party Packages(packages)
10,000+
—
ML/Data Science Library Support(text)
Limited: TensorFlow.js only, requires external API calls
—
Middleware Packages(count)
3,000+
—
Middleware Ecosystem Size(packages)
300,000+
—
Available Packages/Modules(count (millions))
2.3M packages
500K packages
Available Middleware Packages(packages)
3,000+
—
Third-party Packages(packages)
2,000+ packages
—
Related Packages (PyPI)(packages)
~2,100
—
Python/Go Package Ecosystem Size(packages)
400,000+
—
Ecosystem Size (package repositories)(packages)
~480,000 packages (PyPI)
—
Community Library Ecosystem(total packages)
500,000+ PyPI packages (Python ecosystem)
—
Ecosystem Size (Packages)(packages)
~350,000 PyPI packages (FastAPI-specific: ~4,000)
—
Ecosystem Size(packages)
8,000+ packages
—
Base Framework Size(megabytes)
0.05 MB
—
Admin Panel
Third-party package required
—
Learning Time to Proficiency(hours)
25 hours
—
Learning Curve(difficulty rating)
20-30 hours
30-40 hours
Time to First API (Learning Curve)(hours)
15-25 hours
—
Learning Curve Difficulty
Moderate (3.5/5)
—
Community Size (GitHub Stars)(stars)
65k stars
—
GitHub Stars(stars)
64,000+
75,000+ stars
GitHub Stars (Community)(stars)
64,000+ stars
—
Stack Overflow Questions(questions)
500,000+
~30,000 questions
Stack Overflow Questions (all-time)(count)
100,000+
—
Show 4 more attributes
GitHub Stars (Popularity Proxy)(stars)
~64,000 stars
—
Weekly NPM/PyPI Downloads(downloads (millions))
18M+ weekly downloads
2.5M+ weekly downloads
GitHub Stars (as of 2026)(stars)
68,000+ stars
—
GitHub Stars (2026)(stars)
~75,000 stars
—
Development Speed (Median Project Timeline)(weeks)
10-16 weeks
—
Type Safety Support
Optional (TypeScript)
Native (Python type hints)
Native TypeScript Support
Via @types/express
—
Built-in Request Validation
No
Yes (Pydantic)
Built-in Data Validation
Not included, external libraries needed
Built-in with Pydantic
Show 15 more attributes
Time to First Production API(hours)
4-8 hours
—
Out-of-the-Box Testing Support
None (requires external libraries)
—
Average Learning Time(days)
5-7 days for JS developers
—
Time to Deploy Hello World(minutes)
2 minutes
—
Time to Build Hello World API(minutes)
5-10 minutes
2-3 minutes
Automatic API Documentation
Manual setup required
Built-in (OpenAPI/Swagger)
Auto-Documentation Support
Built-in (OpenAPI 3.0)
—
Built-in Documentation Generation
Automatic (Swagger UI + ReDoc)
—
Time to Hello World API(minutes)
~5 minutes
—
Built-in Validation Framework
Pydantic (integrated)
—
Built-in Features Count(features)
12 core features
—
Type Hint Support
Full (enforced)
—
Auto Documentation Generation
Automatic (Swagger UI + ReDoc)
—
Time to 'Hello World' App(lines of code)
8-10 lines
—
Development Time (basic API)(hours)
20-30 hours
—
Production Adoption Rate(percent)
~85%
22% (Stack Overflow 2024)
First Release Year
2010
2018
Production Longevity(years)
15 years (since 2010)
—
Year Released
2010
—
Years in Production(years)
12+ years (released 2010)
—
Time Since Initial Release(years)
4 years (2021)
—
Show 1 more attribute
Framework Age(years)
5 years (since 2018)
—
Time to First API Endpoint(minutes)
15 minutes
~5 minutes
Time to Production (Small API)(hours)
4-8
—
Time to Production Hello World(minutes)
5 minutes
—
Time to Basic API (Hello World)(lines of code)
~5 lines
—
Memory Usage (Idle)(MB)
~55 MB per instance
50-100MB
Cold Start Time (Serverless)(ms)
~300 ms
—
Weekly NPM Downloads(downloads)
16.2 million
~1.2M (PyPI: ~2.8M)
Supported Runtimes(count)
Node.js only
—
Python Version Support(versions)
3.7+
—
Time to Basic Productivity(hours)
10
4-8 hours
Middleware Architecture Pattern
Callback-based (req, res, next)
—
Core Library Size(kilobytes)
52KB
1,200KB (with uvicorn)
Async Support Quality
Promise/async-await (event loop)
Native async/await with asyncio
Native Async Support
Yes (Promises/callbacks)
Full (async-first)
Dependency Injection Container
Not included
—
Async/Await Native Support
Requires wrapper middleware (co, async-await-handler)
Yes, built-in by default
Deployment Model
Requires app server (Uvicorn)
—
Show 3 more attributes
Built-in Dependency Injection(feature availability)
Manual setup required
—
Framework Type
High-level API framework (built on Starlette)
—
Async Support
Native async/await built-in
—
Minimum Python/Node Version
Node.js 12+
Python 3.7+
Minimum Python Version(version)
Python 3.6+
—
NPM Weekly Downloads(downloads)
28.4 million
2.5M weekly
Production Deployments(organizations)
410,000+
~400K active
Production Node.js Apps Using Framework(%)
68%
—
NPM/PyPI Weekly Downloads(weekly downloads)
~20M+ (NPM/week)
~2.8M (PyPI/month)
PyPI Weekly Downloads(downloads)
~2.8M (Jan 2026)
—
Show 1 more attribute
Production Applications (market estimate)(thousands)
45,000+ apps
—
Release Cycle Frequency(months between major versions)
12-18 months
—
Active Job Listings (2025)(positions)
185,000
42,000
Time to First Hello World(lines of code)
6 lines
—
Deployment Without Extra Server(text)
Yes - runs directly with Node.js
—
Edge Runtime Support
Limited via adapters
—
Built-in TypeScript Support
Optional (requires setup)
—
Production Usage (2024 Survey)(% adoption)
32% of Node.js projects
—
Deployment Binary Size(MB)
~40-100 MB (with node_modules)
—
Production Readiness Without External Server
Requires ASGI (Uvicorn)
—
Core Package Size(KB)
~250 KB
—
Enterprise Production Adoption(% of Fortune 500)
68%
—
StackOverflow Questions(questions)
18,000+
—
Core Framework Size(KB)
~300 KB
—
Package Size(MB)
~100 KB
—
Default Dependencies(count)
6 (starlette, pydantic, etc.)
—
Time to Build Basic CRUD App(minutes)
3.5 hours (manual setup required)
—
Lines of Code for Basic Endpoint(lines)
5-8 lines
—
Async-First Support
Native, default behavior
—
Third-Party Extensions Available(plugins)
~2,500 extensions
—
Memory Usage per Process(MB)
~40 MB
—
Minimum Memory Footprint(GB)
40MB
—
Job Market Postings (2026)(active positions)
~12,000 positions
—
Framework Maturity(years)
6 years (released 2018)
—
Pros & Cons
10 pros·6 cons across both
E
F
E
Express.js
+5-3
Pros
- 2.3M+ npm packages for nearly any functionality
- Mature ecosystem with 20+ years of battle-tested patterns
- Excellent for real-time applications with WebSocket support
- Large community (65K GitHub stars, millions of weekly npm downloads)
- Perfect for full-stack JavaScript development (frontend + backend)
Cons
- Requires manual setup for data validation and serialization
- No built-in API documentation; must add Swagger/OpenAPI manually
- 3.5x slower throughput than FastAPI (8,000 vs 28,000 req/s)
F
FastAPI
+5-3
Pros
- 3.5x faster performance (28,000 req/s vs Express's 8,000)
- Automatic OpenAPI/Swagger documentation generation with Swagger UI + ReDoc
- Built-in data validation using Pydantic (catches 85% of API bugs at runtime)
- Native async/await support throughout the framework
- Can write an API in 2-3 minutes with zero boilerplate
Cons
- Smaller ecosystem (500K vs 2.3M packages) limits some specialized use cases
- Younger framework (released 2018) with less battle-tested patterns in production
- Python-only, limiting full-stack JavaScript teams
Frequently Asked Questions
5 questions
FastAPI is significantly faster, handling ~28,000 requests per second compared to Express's ~8,000 req/s in standard benchmarks—a 3.5x advantage. This is due to FastAPI's async-first architecture and Python's optimizations for I/O-bound operations. For most web applications under moderate load, both are fast enough, but FastAPI excels at high-throughput scenarios.
Resources & Learn More
Curated sources to dive deeper
Where to Buy
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Wikipedia
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