Fiber
Open SourceExpress-inspired, fast web framework for Go.
Published 14 October 2026
Scores
Popularity1/5
Well known among Go developers and among Node.js developers moving to Go, but Go's overall audience is small next to Python or JavaScript, and Gin is used more widely in Go.
Learning Curve2/5
The Express-like API is immediately readable for anyone who has used Node.js, and the documentation is clear. The fasthttp value-reuse rule is the one concept that trips up newcomers.
Flexibility4/5
Middleware, groups, and custom engines make it configurable, and v3 lets net/http handlers sit alongside Fiber ones. Persistence and validation are left to separate libraries.
Performance5/5
The fasthttp engine and allocation-conscious design put it at or near the top of Go framework benchmarks, and prefork mode can use more cores on one machine.
Portability3/5
MIT-licensed and a single static binary anywhere. Handlers use Fiber's own context and fasthttp semantics, so moving to a net/http-based framework means rewriting them.
About Fiber
Fiber is an open-source web framework for Go whose API is inspired by Express.js, so routes, middleware, and request handling read like their Node.js equivalents. It was built on the fasthttp HTTP engine rather than the standard net/http server, which gives it very high throughput and low memory use, and it has become popular with developers who move to Go from JavaScript.
The framework covers the usual API and web server needs: routing with groups and parameters, request binding, validation hooks, static files, WebSockets, and streaming responses. A large official middleware set includes CORS, CSRF, rate limiting, caching, compression, sessions, and basic and key authentication, and a prefork mode that runs several processes on one port. A separate template package supports html/template, Handlebars, Pug, and other engines for server-rendered pages.
Fiber v3, released in early 2026, requires a recent Go release and narrows the long-standing gap with the standard library: handlers written for net/http can be used directly in routes, with an adaptor for whole apps and middleware. The context became an interface and the API gained generics-based helpers, and a migration tool helps with the upgrade from v2.
Because Fiber is built on fasthttp, context values are reused between requests. Data from a request must be copied before it leaves the handler, which is the main trap for new users and a reason some teams prefer net/http-based frameworks.
Key Features
- Express-style API for routes, groups, and middleware, familiar to Node.js developers
- Built on the fasthttp engine for high throughput and low memory use
- Official middleware for CORS, CSRF, rate limiting, caching, compression, sessions, and auth
- Prefork mode that runs several processes on one port
- Template engine package supporting html/template, Handlebars, Pug, and others
- WebSockets and streaming response support
- v3 accepts net/http handlers directly and ships an adaptor for net/http middleware
- Migration tool for upgrading from v2 to v3
Pros
- Express-like API makes the move from Node.js to Go quicker
- Among the fastest Go frameworks in benchmarks, with low memory use
- A large first-party middleware collection covers most API needs
- Active development, with a major v3 release and frequent minor versions
- v3 closes much of the net/http compatibility gap
Cons
- Request data is reused between requests, so values must be copied before a handler returns
- Uses fasthttp instead of net/http, so some standard-library tooling and middleware need an adaptor
- The v2 to v3 upgrade has breaking changes to the context and API
- Fiber-specific APIs make a later move to another Go framework a rewrite of the handlers
Fiber Pricing
Open SourceTech Stacks with Fiber
Advanced API (Go)
ProjectA high-performance API stack for advanced engineers. Go handles concurrency with a web framework such as Gin or Echo for routing, PostgreSQL + Redis back the data layer, Prometheus + Grafana provide observability, and Kubernetes can orchestrate containers as an optional addition.
Backend
Programming
Databases
Hosting
Observability
HTMX + Go
ProjectA high-performance server-driven stack. Go with a web framework such as Gin, Echo, or Fiber serves HTML templates and fragment endpoints; HTMX handles browser-side DOM swaps. Minimal footprint, fast cold starts, excellent for performance-critical web apps.
Tools Related to Fiber
Works well with Fiber(1)
Fiber's template engine package renders html/template and other engines into HTML fragments that HTMX swaps into the page, a way to build server-rendered Go interfaces without a JavaScript framework.
Built on (1)
Fiber is an Express-inspired web framework written in Go on top of the fasthttp engine.
Alternatives to Fiber(2)
Fiber has an Express-style API on the fasthttp engine, which suits developers coming from Node.js and wins raw benchmarks; Gin builds on net/http, so standard Go middleware and tooling work unchanged. Pick Fiber for speed and familiarity, Gin for standard-library compatibility.
Fiber trades net/http compatibility for fasthttp speed and an Express-style API; Echo keeps the standard server and error-returning handlers. Pick Fiber for throughput and Node.js familiarity, Echo for standard-library compatibility.