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1 files changed, 4 insertions, 3 deletions

diff --git a/filter/str/string.go b/filter/str/string.go
index c3e2213..37f49f6 100644
--- a/filter/str/string.go
+++ b/filter/str/string.go
@@ -5,6 +5,7 @@ import (
 	"encoding/json"
 	"fmt"
 	"io"
+	"os"
 	"strings"
 
 	"github.com/Shugyousha/stasher/filter"
@@ -40,11 +41,11 @@ func (f *StringFilter) Filter(w *work.Work) *work.Work {
 
 	err := dec.Decode(&jm)
 	if err == io.EOF {
-		fmt.Printf("EOF jm: %v\n", jm)
+		fmt.Fprintf(os.Stderr, "EOF jm: %v\n", jm)
 		return w
 	}
 	if err != nil {
-		fmt.Printf("Error when decoding JSON: %q\n", err)
+		fmt.Fprintf(os.Stderr, "Error when decoding JSON: %q\n", err)
 		w.Err = err
 		return w
 	}
@@ -62,7 +63,7 @@ func (f *StringFilter) Filter(w *work.Work) *work.Work {
 	if changed {
 		bs, err := json.Marshal(jm)
 		if err != nil {
-			fmt.Printf("Error when marshalling JSON: %q\n", err)
+			fmt.Fprintf(os.Stderr, "Error when marshaling JSON: %q\n", err)
 			w.Err = err
 		} else {
 			w.Data = bs