Tag: hello world

Create REST API using gin in Golang

How to create simple REST API using golang and gin package


Golang is a programming language developed by Google. It can used to create cloud services, web , CLI tools etc. The first step to use Go is download and install the SDK.

Basic setup

To build basic API in Golang we need two packages. 

go get github.com/gin-gonic/gin

Gin help us to build API routes . Local JSON data is used for the demonstration. In the main.go file add the following

package main

import  
("github.com/gin-gonic/gin"
"net/http")
 
// album represents data about a record album.
type album struct {
    ID     string  `json:"id"`
    Title  string  `json:"title"`
    Artist string  `json:"artist"`
    Price  float64 `json:"price"`
}

// albums slice to seed record album data.
var albums = []album{
    {ID: "1", Title: "Blue Train", Artist: "John Coltrane", Price: 56.99},
    {ID: "2", Title: "Jeru", Artist: "Gerry Mulligan", Price: 17.99},
    {ID: "3", Title: "Sarah Vaughan and Clifford Brown", Artist: "Sarah Vaughan", Price: 39.99},
}

func index(c *gin.Context){
	c.JSON(200,gin.H{"message": "hi there!"})
}

func getAlbums(c *gin.Context) {
    c.IndentedJSON(http.StatusOK, albums)
}

// postAlbums adds an album from JSON received in the request body.
func postAlbums(c *gin.Context) {
    var newAlbum album

    // Call BindJSON to bind the received JSON to
    // newAlbum.
    if err := c.BindJSON(&newAlbum); err != nil {
        return
    }

    // Add the new album to the slice.
    albums = append(albums, newAlbum)
    c.IndentedJSON(http.StatusCreated, newAlbum)
}

// getAlbumByID locates the album whose ID value matches the id
// parameter sent by the client, then returns that album as a response.
func getAlbumByID(c *gin.Context) {
    id := c.Param("id")

    // Loop through the list of albums, looking for
    // an album whose ID value matches the parameter.
    for _, a := range albums {
        if a.ID == id {
            c.IndentedJSON(http.StatusOK, a)
            return
        }
    }
    c.IndentedJSON(http.StatusNotFound, gin.H{"message": "album not found"})
}

func main(){
	r:=gin.Default()
	r.GET("/",index)
	r.GET("/albums",getAlbums)
	r.POST("/albums", postAlbums)
	r.GET("/albums/:id", getAlbumByID)
	r.Run()
}

Here we created a gin instance which can be used to create API route. We also defined handler functions which handle the request.

:= is the short hand in Golang for creating variables

Run the project

By using go run . or go run main.go can execute the program.

How to create API using mux in Golang

How to create simple API using golang and mux package


Golang is a programming language developed by Google. It can used to create cloud services, web , CLI tools etc. The first step to use Go is download and install the SDK.

Basic setup

To build basic API in Golang we need two packages

go get github.com/gorilla/mux

Mux help us to build API routes . In the main.go file add the following

package main

import  
("github.com/gorilla/mux"
"net/http"
"fmt")

// album represents data about a record album.
type album struct {
    ID     string  `json:"id"`
    Title  string  `json:"title"`
    Artist string  `json:"artist"`
    Price  float64 `json:"price"`
}

// albums slice to seed record album data.
var albums = []album{
    {ID: "1", Title: "Blue Train", Artist: "John Coltrane", Price: 56.99},
    {ID: "2", Title: "Jeru", Artist: "Gerry Mulligan", Price: 17.99},
    {ID: "3", Title: "Sarah Vaughan and Clifford Brown", Artist: "Sarah Vaughan", Price: 39.99},
}
  

func index(w http.ResponseWriter, r *http.Request){
 fmt.Fprint(w,"Hello world!")
}

func getAlbums(w http.ResponseWriter, r *http.Request){
 fmt.Fprint(w,albums)
}
func main(){
	r:=mux.NewRouter()
	r.HandleFunc("/",index).Methods("GET")
	r.HandleFunc("/albums",getAlbums)
	fmt.Println("Server starting")
	http.ListenAndServe(":8080",r)

	 }

Here we create a mux router instance which can be used to create API route. We also define handler function for the API too.

:= is the short hand in Golang for creating variables

Run the project

By using go run . or go run main.go can execute the program.

How to create API using gin in Golang

How to create simple API using golang and gin package


Golang is a programming language developed by Google. It can used to create cloud services, web , CLI tools etc. The first step to use Go is download and install the SDK.

Basic setup

To build basic API in Golang we need two packages

go get github.com/gin-gonic/gin

Gin help us to build API routes . In the main.go file add the following

package main

import  
("github.com/gin-gonic/gin"
"net/http")

  func index(c *gin.Context){
	c.JSON(200,gin.H{"message": "Welcome to Golang API"})
}

func main(){
	r:=gin.Default()
    r.GET("/",index)
	r.Run()
}

Here we create a gin instance which can be used to create API route. We also define handler function for the API too.

:= is the short hand in Golang for creating variables

Run the project

By using go run . or go run main.go can execute the program.

How to create API using Fiber in Golang

How to create simple API using golang and express like Fiber package


Golang is a programming language developed by Google. It can used to create cloud services, web , CLI tools etc. The first step to use Go is download and install the SDK.

Basic setup

To build basic API in Golang we need following packages

go get -u github.com/gofiber/fiber/v2

Fiber is express inspired library, if you were familiar with Nodejs express package, no worries . In the main.go file add the following

package main

import  
("github.com/gofiber/fiber/v2"
"fmt"
"log"
)
 
func api(c *fiber.Ctx) error {
    msg := fmt.Sprintf("✋ %s", c.Params("*"))
    return c.SendString(msg) // => ✋ register
}


func index(c *fiber.Ctx) error {
    return c.SendString("I am Fiber") // => ✋ register
}


func main(){
	app:= fiber.New()
    app.Get("/",index )
    app.Get("/api/*",api )
    log.Fatal(app.Listen(":3000"))
}

Here we create a Fiber router instance which can be used to create API route. We also define handler function for the API too.

:= is the short hand in Golang for creating variables

Run the project

By using go run . or go run main.go can execute the program.

Set up golang project

How to setup and use golang


Golang is a programming language developed by Google. It can used to create cloud services, web , CLI tools etc. The first step to use Go is download and install the SDK.

Hello world

After the installation please check the environment variables, make sure the path being added your system.

go version
go env

Now you are ready to stat writing your code. create a simple directory and cd into it.

on the terminal issue the following command to initialize the project module.

go mod init example/helloword

It will create .mod file which is similar to package.json in Nodejs projects where dependencies listed.

create main.go

This is the entry point to your project. Every go program should start with a main function

//main.go
package main

import  "fmt"
func main(){
fmt.printline('Hello word')
}

Run the project

By using go run . or go run main.go can execute the program.