gin

Gin is a web framework for the Go programming language. A web framework is a starter kit that handles the common, repetitive parts of building a web service — receiving incoming HTTP requests, matching them to the right piece of code, parsing the data, and sending a response back — so you don't have to write that plumbing every time. Gin's particular focus is speed: it advertises a Martini-like API but says it runs up to forty times faster, thanks to a tuned router called httprouter.

The way Gin works is that you describe the URLs your service handles and the function that should run for each one. When a request comes in, Gin's router quickly matches it to the right function, gives that function a context object with the request data, and lets you return a JSON, XML, or HTML response. Common needs are handled by built-in middleware — small reusable pieces of code that run on every request — for logging, crash recovery, JSON validation, and cross-origin handling. You can group routes together to apply shared middleware, and the framework includes error management and built-in template rendering.

You would use Gin when you are building a REST API, a microservice that has to handle many concurrent requests, or a web application where response time matters. The README emphasizes high-throughput APIs and quick prototyping with minimal boilerplate as the main use cases. Gin requires Go 1.25 or above and is installed by importing the package in your code, where Go's module system fetches it automatically. There is a community ecosystem of middleware and plugins and an examples repository covering authentication, file uploads, WebSockets, and template rendering.