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Build Your First Rest API with GO

Mofi Rahman on September 04, 2019

Build Your First Rest API with GO There is three part to this workshop. API Rest API Rest API with GO API If you have bee...

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Jer • Oct 27 '19

Hey @moficodes ! I wanted to thank you for the article. It works as a great bridge between some of the more terse tutorials and examples out there and winding up with a working SPA+API running on Go.

So, thanks for the work you put in ! I greatly appreciate it.

Mofi Rahman • Oct 28 '19

I am glad you liked it. 🥰

Ryan McCormick • Mar 3 '20

Great primer for writing REST APIs in golang. I am a go newbie and stumbled on to this article. Quick note about some of the example code for typo fix or for anyone else working through the example:

The beginning of the exercise has the w.WriteHeader and w.Header().Set lines flip-flopped.
while running the example at the beginning I kept getting "text/plain" for my response content type instead of "application/json". It looks to be correct elsewhere but w.Header().Set should be called before w.WriteHeader. According to docs: "Changing the header map after a call to WriteHeader (or Write) has no effect unless the modified headers are trailers".

Mofi Rahman • Mar 24 '20

Thanks for catching that.

Fixed it.

Steve Klassen (They/Them) • Jan 3 '20

There's a typo on this line:

log.Fatal(http.ListenAndServe(":8080", r))

Should be:

log.Fatal(http.ListenAndServe(":8080", api))

Mofi Rahman • Jan 3 '20

r := mux.NewRouter()

is my mux router. api is a subrouter on r.

In this example using api instead of r would work.

But if i have other routes on r this would not work.

Steve Klassen (They/Them) • Jan 3 '20

Oops, good point. I think I hadn't used api yet and it was complaining about that.

Mofi Rahman • Jan 3 '20

one of the "best worst" feature of go. :D

chinglin • Jan 13 '20

I'd more concern about the following area

Api-doc generation ( go-swagger? )
The limit or rate control relate stuff.
How things integrate with auth token ( jwt stuff ).

dirtyfishtank • Jan 28 '20

Excellent article. Much appreciated!

Zenifer Cheruveettil • Sep 8 '20

good one, it helped!

thanks

zen

PVillela • Dec 27 '20

Thanks for the excellent tutorial.

Neelesh • Jul 24 '20

really awesome dude

ajeyprasand • Jan 14 '20

bro thanks for the article however why did u did not add any code in the stuct called server initially ??

Mofi Rahman • Mar 24 '20

type server struct{}

func (s *server) ServeHTTP(w http.ResponseWriter, r *http.Request) {
    w.Header().Set("Content-Type", "application/json")
        w.WriteHeader(http.StatusOK)
    w.Write([]byte(`{"message": "hello world"}`))
}

You are talking about this part I believe.

For http.Handle it just needs some type that implements the handler interface.

For example, this below is valid code.

type hotdog int

func (s *hotdog) ServeHTTP(w http.ResponseWriter, r *http.Request) {
    w.Header().Set("Content-Type", "application/json")
        w.WriteHeader(http.StatusOK)
    w.Write([]byte(`{"message": "hello world"}`))
}

func main() {
    var s hotdog
    http.Handle("/", &s)
    log.Fatal(http.ListenAndServe(":8080", nil))
}

Jiten Patel • Oct 17 '21

New to go lang. What an article hats off 🙇