Go in a Nix Shell

.envrc

use flake

flake.nix

{
  description = "A very basic flake";

  inputs = {
    nixpkgs.url = "github:nixos/nixpkgs?ref=nixos-unstable";
  };

  outputs = { self, nixpkgs }: {
    devShells.x86_64-linux.default = let 
      pkgs = nixpkgs.legacyPackages.x86_64-linux;
    in pkgs.mkShell {
        packages = [
            pkgs.go
        ];
    };
  };
}

go.mod

module foo

go 1.22.2

require github.com/go-chi/chi/v5 v5.0.12

main.go

package main

import (
    "log"
    "log/slog"
    "net/http"

    "github.com/go-chi/chi/v5"
)

func main() {
    router := chi.NewMux()

    port := ":3000"
    slog.Info("Application running on", "port", port)
    log.Fatal(http.ListenAndServe(port, router))
}