Golang : Output or print out JSON stream/encoded data

Problem :

You need to produce JSON stream or JSON encoded data to web browser or client. How to do that?

Solution :

Set the header Content-Type to application/json and write the http.ResponseWriter.

For example :

 package main

 import (
  "net/http"
 )

 func Employees(w http.ResponseWriter, r *http.Request) {
  w.Header().Set("Content-Type", "application/json")

 // NOTE : put jsonStr in a FOR loop to read forever from database and encode the data with
 // json.Marshal() function to produce JSON stream
 // see https://www.socketloop.com/tutorials/golang-convert-csv-data-to-json-format-and-save-to-file

 // for this example, we will use static JSON string

  jsonStr := `[{"Name":"Dennis","Age":16,"Job":"CEO"},
 {"Name":"Eva","Age":34,"Job":"CFO"},
 {"Name":"Paul","Age":28,"Job":"COO"}]`


 // output to web or client
  w.Write([]byte(jsonStr))
 }

 func main() {

  mux := http.NewServeMux()
  mux.HandleFunc("/", Employees)

  http.ListenAndServe(":8080", mux)
 }

Reference :

https://www.socketloop.com/tutorials/golang-unmarshal-json-from-http-response