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
See also : Golang : Unmarshal JSON from http response
By Adam Ng
IF you gain some knowledge or the information here solved your programming problem. Please consider donating to the less fortunate or some charities that you like. Apart from donation, planting trees, volunteering or reducing your carbon footprint will be great too.
Advertisement
Tutorials
+30.4k Golang : How to verify uploaded file is image or allowed file types
+17.7k Golang : delete and modify XML file content
+19.3k Golang : Get RGBA values of each image pixel
+5.8k Golang : Fix opencv.LoadHaarClassifierCascade The node does not represent a user object error
+8.2k Prevent Write failed: Broken pipe problem during ssh session with screen command
+6.4k PHP : Proper way to get UTF-8 character or string length
+12.2k Golang : calculate elapsed run time
+6.5k PHP : Shuffle to display different content or advertisement
+18.4k Golang : Read binary file into memory
+10.2k Golang : Check a web page existence with HEAD request example
+9.6k Golang : Read file with ioutil
+29.2k Golang : missing Git command