diff --git a/src/email.go b/src/email.go
index 6075c17e..1b25acc4 100644
--- a/src/email.go
+++ b/src/email.go
@@ -1,7 +1,6 @@
 package main
 
 import (
-	"fmt"
 	"log"
 	"net/smtp"
 	"strconv"
@@ -43,8 +42,8 @@ func adminEmailAlert(action string, adminEmail string, cfg Config) {
 	err := smtp.SendMail(cfg.SMTP.Server+":"+cfg.SMTP.Port,
 		auth, cfg.SMTP.User, dest, []byte(msg))
 	if err != nil {
-		fmt.Printf("smtp error: %s", err)
+		log.Printf("smtp error: %s", err)
 		return
 	}
-	fmt.Println("Mail sent successfully!")
+	log.Println("Mail sent successfully!")
 }
diff --git a/src/lbasis_db.go b/src/lbasis_db.go
index 0992acee..86f729d4 100644
--- a/src/lbasis_db.go
+++ b/src/lbasis_db.go
@@ -2,7 +2,7 @@ package main
 
 import (
 	"encoding/json"
-	"fmt"
+	"log"
 	"strings"
 	"time"
 
@@ -41,7 +41,7 @@ func (dbobj dbcon) createLegalBasis(brief string, newbrief string, module string
 	bdoc["requiredflag"] = requiredflag
 	raw, err := dbobj.store.GetRecord(storage.TblName.Legalbasis, "brief", brief)
 	if err != nil {
-		fmt.Printf("error to find:%s", err)
+		log.Printf("error to find: %s\n", err)
 		return false, err
 	}
 	if raw != nil {
@@ -56,7 +56,7 @@ func (dbobj dbcon) createLegalBasis(brief string, newbrief string, module string
 	bdoc["creationtime"] = now
 	_, err = dbobj.store.CreateRecord(storage.TblName.Legalbasis, &bdoc)
 	if err != nil {
-		fmt.Printf("error to insert record: %s\n", err)
+		log.Printf("error to insert record: %s\n", err)
 		return false, err
 	}
 	return true, nil
@@ -188,7 +188,7 @@ func (dbobj dbcon) checkLegalBasis(brief string) (bool, error) {
 func (dbobj dbcon) getLegalBasis(brief string) (bson.M, error) {
 	row, err := dbobj.store.GetRecord(storage.TblName.Legalbasis, "brief", brief)
 	if err != nil {
-		fmt.Printf("error to find:%s", err)
+		log.Printf("error to find: %s\n", err)
 		return nil, err
 	}
 	return row, err
diff --git a/src/sharedrecords_api.go b/src/sharedrecords_api.go
index ca2412f0..1dea957a 100644
--- a/src/sharedrecords_api.go
+++ b/src/sharedrecords_api.go
@@ -95,7 +95,7 @@ func (e mainEnv) getRecord(w http.ResponseWriter, r *http.Request, ps httprouter
 	}
 	recordInfo, err := e.db.getSharedRecord(record)
 	if err != nil {
-		fmt.Printf("%d access denied for : %s\n", http.StatusForbidden, record)
+		log.Printf("%d access denied for : %s\n", http.StatusForbidden, record)
 		w.WriteHeader(http.StatusForbidden)
 		w.Write([]byte("Access denied"))
 		return
diff --git a/src/sms.go b/src/sms.go
index 8b5e165c..a25c9372 100644
--- a/src/sms.go
+++ b/src/sms.go
@@ -1,7 +1,6 @@
 package main
 
 import (
-	"fmt"
 	"log"
 	"net/http"
 	"net/url"
@@ -26,7 +25,7 @@ func sendCodeByPhoneDo(domain string, client *http.Client, code int32, identity
 	finalURL = strings.ReplaceAll(finalURL, "_FROM_", url.QueryEscape(cfg.Sms.From))
 	finalURL = strings.ReplaceAll(finalURL, "_TOKEN_", url.QueryEscape(cfg.Sms.Token))
 	finalURL = strings.ReplaceAll(finalURL, "_MSG_", url.QueryEscape(msg))
-	fmt.Printf("finalURL: %s\n", finalURL)
+	log.Printf("sendCodeByPhoneDo finalURL: %s\n", finalURL)
 	if len(cfg.Sms.Method) == 0 || strings.ToUpper(cfg.Sms.Method) == "GET" {
 		req, _ := http.NewRequest("GET", finalURL, nil)
 		if len(cfg.Sms.BasicAuth) > 0 && strings.Contains(cfg.Sms.BasicAuth, ":") {
@@ -42,7 +41,7 @@ func sendCodeByPhoneDo(domain string, client *http.Client, code int32, identity
 			}
 		}
 		resp, _ := client.Do(req)
-		fmt.Println(resp.Status)
+		log.Println(resp.Status)
 		return
 	}
 	body := cfg.Sms.Body
@@ -82,5 +81,5 @@ func sendCodeByPhoneDo(domain string, client *http.Client, code int32, identity
 	}
 	req.Header.Add("Content-Type", cType)
 	resp, _ := client.Do(req)
-	fmt.Println(resp.Status)
+	log.Println(resp.Status)
 }
diff --git a/src/storage/sqlite-storage.go b/src/storage/sqlite-storage.go
index ca311799..ccef0262 100644
--- a/src/storage/sqlite-storage.go
+++ b/src/storage/sqlite-storage.go
@@ -77,7 +77,7 @@ func (dbobj *SQLiteDB) OpenDB(filepath *string) error {
 	if len(dbfile) >= 3 && dbfile[len(dbfile)-3:] != ".db" {
 		dbfile = dbfile + ".db"
 	}
-	fmt.Printf("Databunker db file is: %s\n", dbfile)
+	log.Printf("Databunker db file is: %s\n", dbfile)
 	// collect list of all tables
 	/*
 		if _, err := os.Stat(dbfile); !os.IsNotExist(err) {
diff --git a/src/users_api.go b/src/users_api.go
index 23537fbd..4a90ca6f 100644
--- a/src/users_api.go
+++ b/src/users_api.go
@@ -3,6 +3,7 @@ package main
 import (
 	"errors"
 	"fmt"
+	"log"
 	"net/http"
 
 	"github.com/julienschmidt/httprouter"
@@ -17,7 +18,7 @@ func (e mainEnv) userCreate(w http.ResponseWriter, r *http.Request, ps httproute
 	if e.conf.Generic.CreateUserWithoutAccessToken == false {
 		// anonymous user can not create user record, check token
 		if e.enforceAuth(w, r, event) == "" {
-			fmt.Println("failed to create user, access denied, try to change Create_user_without_access_token")
+			log.Println("failed to create user, access denied, try to configure Create_user_without_access_token\n")
 			return
 		}
 	}
@@ -182,7 +183,7 @@ func (e mainEnv) userList(w http.ResponseWriter, r *http.Request, ps httprouter.
 		limit = atoi(value[0])
 	}
 	resultJSON, counter, _ := e.db.getUsers(offset, limit)
-	fmt.Printf("Total count of events: %d\n", counter)
+	log.Printf("Total count of events: %d\n", counter)
 	w.Header().Set("Content-Type", "application/json; charset=utf-8")
 	w.WriteHeader(200)
 	if counter == 0 {
@@ -400,7 +401,7 @@ func (e mainEnv) userPrelogin(w http.ResponseWriter, r *http.Request, ps httprou
 			fmt.Fprintf(w, `{"status":"error","result":"record not found","captchaurl":"%s"}`, captcha)
 			return
 		}
-		fmt.Println("user record not found, still returning ok status")
+		log.Println("user record not found, returning ok status")
 	}
 	w.Header().Set("Content-Type", "application/json; charset=utf-8")
 	w.WriteHeader(200)
diff --git a/src/utils.go b/src/utils.go
index c8f13a3e..c0772fb4 100644
--- a/src/utils.go
+++ b/src/utils.go
@@ -469,7 +469,7 @@ func enforceUUID(w http.ResponseWriter, uuidCode string, event *auditEvent) bool
 func getJSONPostMap(r *http.Request) (map[string]interface{}, error) {
 	cType, _, err := mime.ParseMediaType(r.Header.Get("Content-Type"))
 	if err != nil {
-		fmt.Printf("ignoring empty content-type: %s\n", err)
+		log.Printf("ignoring empty content-type: %s\n", err)
 		return nil, nil
 	}
 	cType = strings.ToLower(cType)
@@ -492,7 +492,7 @@ func getJSONPostMap(r *http.Request) (map[string]interface{}, error) {
 		}
 		form, err := url.ParseQuery(body)
 		if err != nil {
-			fmt.Printf("error in http data parsing: %s\n", err)
+			log.Printf("error to parse HTTP data request: %s\n", err)
 			return nil, err
 		}
 		if len(form) == 0 {
@@ -529,7 +529,7 @@ func getJSONPostMap(r *http.Request) (map[string]interface{}, error) {
 func getJSONPostData(r *http.Request) ([]byte, error) {
 	cType, _, err := mime.ParseMediaType(r.Header.Get("Content-Type"))
 	if err != nil {
-		fmt.Printf("ignoring empty content-type: %s\n", err)
+		log.Printf("ignoring empty content-type: %s\n", err)
 		return nil, nil
 	}
 	cType = strings.ToLower(cType)
@@ -553,7 +553,7 @@ func getJSONPostData(r *http.Request) ([]byte, error) {
 		}
 		form, err := url.ParseQuery(body)
 		if err != nil {
-			fmt.Printf("error in http data parsing: %s\n", err)
+			log.Printf("error in HTTP data request: %s\n", err)
 			return nil, err
 		}
 		if len(form) == 0 {