diff --git a/compose/types/validated.go b/compose/types/validated.go
index 7041ccaad..83c06703b 100644
--- a/compose/types/validated.go
+++ b/compose/types/validated.go
@@ -1,6 +1,7 @@
 package types
 
 import (
+	"encoding/json"
 	"errors"
 	"fmt"
 )
@@ -17,6 +18,9 @@ type (
 	}
 )
 
+// safe to show details of this error
+func (RecordValueErrorSet) Safe() bool { return true }
+
 func (v *RecordValueErrorSet) Push(err ...RecordValueError) {
 	v.Set = append(v.Set, err...)
 }
@@ -29,6 +33,16 @@ func (v *RecordValueErrorSet) Error() string {
 	return fmt.Sprintf("%d issue(s) found", len(v.Set))
 }
 
+func (v RecordValueErrorSet) MarshalJSON() ([]byte, error) {
+	return json.Marshal(struct {
+		Message string             `json:"message"`
+		Set     []RecordValueError `json:"set,omitempty"`
+	}{
+		Message: v.Error(),
+		Set:     v.Set,
+	})
+}
+
 // IsRecordValueErrorSet tests if given error is RecordValueErrorSet (or it wraps it) and it has errors
 // If not is not (or !IsValid), it return nil!
 func IsRecordValueErrorSet(err error) *RecordValueErrorSet {
diff --git a/pkg/errors/error.go b/pkg/errors/error.go
index f9af5b483..fce75078f 100644
--- a/pkg/errors/error.go
+++ b/pkg/errors/error.go
@@ -59,6 +59,9 @@ func Newf(k kind, m string, a ...interface{}) *Error {
 	return err(k, fmt.Sprintf(m, a...))
 }
 
+// safe to show details of this error
+func (Error) Safe() bool { return true }
+
 // Error message
 func (e Error) Error() string {
 	return e.message
@@ -115,6 +118,6 @@ func Is(err, target error) bool {
 }
 
 // As is alias for errors.As so users can avoid importing both errors packages
-func As(err, target error) bool {
+func As(err error, target interface{}) bool {
 	return errors.As(err, target)
 }