Can't import a Go module

Question

I'm learning Go ad I'm trying to build go file:

package main

import (
    "github.com/go-chi/chi/v5"
    "github.com/go-chi/chi/v5/middleware"
    "net/http"
)

func main() {
    r := chi.NewRouter()
    r.Use(middleware.Logger)
    r.Get("/", func(w http.ResponseWriter, r *http.Request) {
        w.Write([]byte("welcome"))
    })
    http.ListenAndServe(":3000", r)
}

But when I build the program with the command go build main.go, it outputs:

go: github.com/go-chi/chi/@v1.5.4: missing go.sum entry; to add it:
        go mod download github.com/go-chi/chi/

go.mod:

module exprog

go 1.16

require github.com/go-chi/chi/ v1.5.4

when I execute go mod download github.com/go-chi/chi/, I get this error:

go: github.com/go-chi/chi/@v1.5.4: malformed module path "github.com/go-chi/chi/": trailing slash

What I should do?

don't try to build individual go files, build the package. I'm not sure how you got `go mod download github.com/go-chi/chi/`, but you should be using `go get github.com/go-chi/chi/v5` — JimB, Sep 27 '21 at 14:30
You tried what exactly? Please create a [mre], because the single [go source you have](https://play.golang.org/p/z332IlxMjMe) will not produce this error. — JimB, Sep 27 '21 at 14:40

score 2 · Answer 1 · answered Sep 29 '21 at 09:57

2

It's error not in command, it's error in go.mod file. You can fix by:

module exprog

go 1.16

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

answered Sep 29 '21 at 09:57

score -1 · Accepted Answer · answered Sep 27 '21 at 14:34

-1

Assuming you're looking to download this module, You should do go mod download github.com/go-chi/chi/v5. The name of the module is the header in the dependency's go.mod file.

You can remove the entry from go.mod and simply do go mod download github.com/go-chi/chi/v5

or

You can remove the entry from go.mod, and do go mod tidy. Go will fill your go.mod file based on your imports. You can do go mod download then.

answered Sep 27 '21 at 14:34

srikar jagannadh

92
1
4

1

Go will automatically run `go mod tidy` for you if you initialize a module `with go mod init ....`. – erik258 Sep 27 '21 at 14:53
The previous comment adds to the answer but it does not explain a downvote. – Sep 27 '21 at 21:56

Can't import a Go module

2 Answers2