Go Rest API

by Online Tutorials Library July 14, 2022

Go REST API Example

 package main import (    “encoding/json”    “log”    “net/http”    “github.com/gorilla/mux” ) type Employee struct {    ID        string   ‘json:”id,omitempty”‘    Firstname string   ‘json:”firstname,omitempty”‘    Lastname  string   ‘json:”lastname,omitempty”‘    Address   *Address ‘json:”address,omitempty”‘ } type Address struct {    City  string ‘json:”city,omitempty”‘    State string ‘json:”state,omitempty”‘ } var emp []Employee func GetEmpIdEndpoint(w http.ResponseWriter, req *http.Request) {    params := mux.Vars(req)    for _, item := range emp {       if item.ID == params[“id”] {          json.NewEncoder(w).Encode(item)          return       }    }    json.NewEncoder(w).Encode(&Employee{}) } func GetEmployeeEndpoint(w http.ResponseWriter, req *http.Request) {    json.NewEncoder(w).Encode(emp) } func CreateEmployeeEndpoint(w http.ResponseWriter, req *http.Request) {    params := mux.Vars(req)    var person Employee    _ = json.NewDecoder(req.Body).Decode(&person)    person.ID = params[“id”]    emp = append(emp, person)    json.NewEncoder(w).Encode(emp) } func DeleteEmployeeEndpoint(w http.ResponseWriter, req *http.Request) {    params := mux.Vars(req)    for index, item := range emp {       if item.ID == params[“id”] {          emp = append(emp[:index], emp[index+1:]…)          break       }    }    json.NewEncoder(w).Encode(emp) } func main() {    router := mux.NewRouter()    emp = append(emp, Employee{ID: “1”, Firstname: “Nic”, Lastname: “Raboy”,     Address: &Address{City: “Dublin”, State: “CA”}})    emp = append(emp, Employee{ID: “2”, Firstname: “Maria”, Lastname: “Raboy”})    router.HandleFunc(“/employee”, GetEmployeeEndpoint).Methods(“GET”)    router.HandleFunc(“/employee/{id}”, GetEmpIdEndpoint).Methods(“GET”)    router.HandleFunc(“/employee/{id}”, CreateEmployeeEndpoint).Methods(“POST”)    router.HandleFunc(“/employee/{id}”, DeleteEmployeeEndpoint).Methods(“DELETE”)    log.Fatal(http.ListenAndServe(“:12345”, router)) } 

Output:

You can check the output by installing postman extension for chrome browser

Method –> Get,

  url –>http://localhost:8080/employee Response :  [{“id”:”1″,”firstname”:”James”,”lastname”:”Johnson”,”address”:{“city”:”Hoseynabad”,”state”:”Kavir”}} ,{“id”:”2″,”firstname”:”Sarah”,”lastname”:”Taylor”,”address”:{“city”:”Kamenka”,”state”:”Vyborgsky”}}] 

Method –> GET,

  url –>http://localhost:8080/employee/1 Response :  {“id”:”1″,”firstname”:”James”,”lastname”:”Johnson”,”address”: “city”:”Hoseynabad”,”state”:”Kavir”}} 

Method –> POST,

 url –>http://localhost:8080/employee/3 Response :  [{“id”:”1″,”firstname”:”James”,”lastname”:”Johnson”,”address”:{“city”:”Hoseynabad”,”state”:”Kavir”}}, {“id”:”2″,”firstname”:”Sarah”,”lastname”:”Taylor”,”address”:{“city”:”Kamenka”,”state”:”Vyborgsky”}}, {“id”:”3″,”firstname”:”Roger”,”lastname”:”Ponting”,”address”:{“city”:”San Pedro”,”state”:”LA”}}] 

Method –> DELETE,

 url –>http://localhost:8080/employee/2 Response :  [{“id”:”1″,”firstname”:”James”,”lastname”:”Johnson”,”address”:{“city”:”Hoseynabad”,”state”:”Kavir”}}, {“id”:”3″,”firstname”:”Roger”,”lastname”:”Ponting”,”address”:{“city”:”San Pedro”,”state”:”LA”}}] 

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