Go Status Page Using expvar

status.go

package status

import (
	"expvar"
	"net/http"
	"encoding/json"
)

// Status method dumps application variables and their values in JSON format.
func Status(writer http.ResponseWriter, request *http.Request) {
	vars := make(map[string]string)
	expvar.Do(func(kv expvar.KeyValue) {
		vars[kv.Key] = kv.Value.String()
	})

	// Need error handling and closing request body.
	writer.Header().Set("Content-Type", "application/json; charset=UTF-8")
	json.NewEncoder(writer).Encode(vars)
}