fastapi vs fiber
Two of the top projects in Backend and cloud templates, side by side: who leads on each score part and who each one suits, then setup, license, activity and what each review found.
fastapi
Python web framework for typed REST APIs with automatic OpenAPI docs
fiber
Express-style HTTP web framework for Go, built on fasthttp
Verdict
Both score 90; fastapi ranks higher on stars, 104,615 to 40,271. Of the 4 score parts we measure for both, fastapi leads on 2, fiber on 1 and 1 is even.
- Adoptionfastapi leads by 7 points, 99 to 92.
- FreshnessEven at 100.
- Maintenancefastapi leads by 3 points, 100 to 97: close to even.
- Agent-readyfiber leads by 30 points, 30 to 0: a wide gap.
Pick fastapi if you are
Python developers building API backends, including model-serving ones
- Validates path, query, header, cookie, form and JSON body data from type hints alone
- Generates OpenAPI schema plus Swagger UI and ReDoc pages with no extra setup
Pick fiber if you are
Go developers building HTTP APIs and web backends
- Express-like routing, groups and middleware chain, familiar to Node.js developers
- Built-in middleware for static files, logger, CORS, rate limiter, plus WebSocket and SSE
| What we compare | fastapi | fiber |
|---|---|---|
| Score parts, out of 100 | ||
| Adoption | 99, widely used | 92, widely used |
| Momentum | Not scored for this kind | Not scored for this kind |
| Freshness | 100, active | 100, active |
| Maintenance | 100, healthy | 97, healthy |
| Agent-ready | 0, none | 30, minimal |
| Facts from GitHub and the README | ||
| Stars | 104.6k | 40.3k |
| License | MIT (permissive) | MIT (permissive) |
| Last commit | Nov 2026 | Nov 2026 |
| Last release | Nov 2026 | Nov 2026 |
| Language | Python | Go |
| Docker | No | No |
| GPU | Not needed | Not needed |
| arm64 or Apple Silicon | Not stated | Not stated |
fastapi
FastAPI is a Python framework for building HTTP APIs from standard type hints. It uses Starlette for the web layer and Pydantic for validation and serialization, and generates OpenAPI and JSON Schema documentation with Swagger UI at /docs and ReDoc at /redoc. It is a general-purpose framework, not an AI-specific starter.
Who it is for: Python developers building API backends, including model-serving ones
Strengths
- Validates path, query, header, cookie, form and JSON body data from type hints alone
- Generates OpenAPI schema plus Swagger UI and ReDoc pages with no extra setup
- Includes dependency injection, OAuth2/JWT, HTTP Basic auth, WebSockets and CORS
- `fastapi dev` gives auto-reload; `fastapi run` is the production command
Weaknesses
- No model, agent or other AI functionality included; you wire that in yourself
- No ORM or database layer; persistence is left to other libraries
- Relies on Starlette and Pydantic, so changes in either affect your app
- Productivity figures come from an internal team's estimates, not reproducible benchmarks
- Python
- Needs Starlette, Pydantic, Uvicorn
fiber
Fiber is a Go web framework with an Express-like API for routing, middleware and handlers, running on top of fasthttp. It ships middleware for static files, logging, CORS and rate limiting, plus WebSocket, Socket.io and Server-Sent Events support, and can adapt net/http handlers. It is a general backend framework, not an AI project.
Who it is for: Go developers building HTTP APIs and web backends
Strengths
- Express-like routing, groups and middleware chain, familiar to Node.js developers
- Built-in middleware for static files, logger, CORS, rate limiter, plus WebSocket and SSE
- Runs net/http handlers directly and has an adaptor middleware for net/http middleware
- Zero-allocation design on fasthttp, with TechEmpower benchmark results published
Weaknesses
- fiber.Ctx values are reused across requests, so keeping references after the handler returns is unsafe
- Uses unsafe, so it may lag behind the newest Go releases
- Requires Go 1.26 or higher for v3
- Adapted net/http handlers lose fiber.Ctx features and add compatibility overhead
- Go
- Needs Go 1.26+, fasthttp
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