diff --git a/peer/server.go b/peer/server.go
index 23ea7eb..cc10e0f 100644
--- a/peer/server.go
+++ b/peer/server.go
@@ -2,7 +2,9 @@ package peer
 
 import (
 	"bufio"
+	"encoding/hex"
 	"encoding/json"
+	ee "errors"
 	"io"
 	"net"
 	"strings"
@@ -220,6 +222,10 @@ func (s *Server) handleCompositeRequest(data []byte) ([]byte, error) {
 	var request compositeRequest
 	err := json.Unmarshal(data, &request)
 	if err != nil {
+		var je json.SyntaxError
+		if ee.As(err, &je) {
+			return nil, errors.Err("invalid json at offset %d in data %s", je.Offset, hex.EncodeToString(data))
+		}
 		return nil, errors.Err(err)
 	}