diff --git a/json_column.go b/json_column.go
index fd4cf4b..3b28600 100644
--- a/json_column.go
+++ b/json_column.go
@@ -4,7 +4,6 @@ import (
 	"encoding/json"
 	"fmt"
 	"path"
-	"strconv"
 	"time"
 
 	"cloud.google.com/go/civil"
@@ -36,13 +35,20 @@ func (c *JSONColumn) marshal(t *gspanner.Type, v *structpb.Value) (interface{},
 	// See: https://godoc.org/google.golang.org/genproto/googleapis/spanner/v1#TypeCode
 	switch t.Code {
 	case gspanner.TypeCode_INT64:
+		// JavaScript's integral part is 53bit. see Number.MAX_SAFE_INTEGER.
+		return v.GetStringValue(), nil
+	case gspanner.TypeCode_FLOAT64:
 		s := v.GetStringValue()
-		n, err := strconv.ParseInt(s, 10, 64)
-		if err != nil {
-			return nil, err
+		switch s {
+		case "NaN", "Infinity", "-Infinity":
+			// NaN, Infinity, -Infinity will be null on JSON with JavaScript.
+			// http://www.ecma-international.org/ecma-262/10.0/index.html#sec-serializejsonproperty
+			return nil, nil
 		}
-		return n, nil
-	case gspanner.TypeCode_FLOAT64:
+		// golang:     https://golang.org/ref/spec#Numeric_types
+		// 		       float64     the set of all IEEE-754 64-bit floating-point numbers
+		// ECMAScript: http://www.ecma-international.org/ecma-262/10.0/index.html#sec-ecmascript-language-types-number-type
+		//             representing the double-precision 64-bit format IEEE 754-2008 values as specified in the IEEE Standard for Binary Floating-Point Arithmetic
 		return v.GetNumberValue(), nil
 	case gspanner.TypeCode_STRING:
 		return v.GetStringValue(), nil
@@ -99,7 +105,10 @@ func (c *JSONColumn) schema(o JSONObject, t *gspanner.Type, options ...jsonschem
 	switch t.Code {
 	default:
 		return fmt.Errorf("unsupport type: type:%v", t)
-	case gspanner.TypeCode_INT64, gspanner.TypeCode_FLOAT64:
+	case gspanner.TypeCode_INT64:
+		o.Set("type", "string")
+		o.Set("format", "int64")
+	case gspanner.TypeCode_FLOAT64:
 		o.Set("type", "number")
 	case gspanner.TypeCode_STRING:
 		o.Set("type", "string")
diff --git a/json_column_test.go b/json_column_test.go
index f5791fa..5035805 100644
--- a/json_column_test.go
+++ b/json_column_test.go
@@ -5,12 +5,14 @@ import (
 
 	"cloud.google.com/go/spanner"
 	. "github.com/gcpug/hake"
+	structpb "github.com/golang/protobuf/ptypes/struct"
+	gspanner "google.golang.org/genproto/googleapis/spanner/v1"
 )
 
 func TestColumn_MarshalJSON(t *testing.T) {
 
 	type T struct {
-		N int
+		N interface{}
 		S string
 	}
 
@@ -18,18 +20,26 @@ func TestColumn_MarshalJSON(t *testing.T) {
 		T T
 	}
 
+	floatWithString := func(s string) *spanner.GenericColumnValue {
+		return &spanner.GenericColumnValue{Type: &gspanner.Type{Code: gspanner.TypeCode_FLOAT64}, Value: &structpb.Value{Kind: &structpb.Value_StringValue{StringValue: s}}}
+	}
+
 	cases := []struct {
 		name string
 		col  *spanner.GenericColumnValue
 		want string
 	}{
 		{"null", column(t, nil), toJSON(t, nil)},
-		{"int", column(t, 100), toJSON(t, 100)},
+		{"int", column(t, 100), toJSON(t, "100")},
+		{"big int", column(t, 72057596404714278), toJSON(t, "72057596404714278")},
 		{"float", column(t, 10.5), toJSON(t, 10.5)},
+		{"float with NaN", floatWithString("NaN"), toJSON(t, nil)},
+		{"float with Infinity", floatWithString("Infinity"), toJSON(t, nil)},
+		{"float with -Infinity", floatWithString("-Infinity"), toJSON(t, nil)},
 		{"string", column(t, "test"), toJSON(t, "test")},
 		{"bool", column(t, true), toJSON(t, true)},
-		{"struct", column(t, T{N: 100, S: "test"}), toJSON(t, T{N: 100, S: "test"})},
-		{"nested struct", column(t, NT{T{N: 100, S: "test"}}), toJSON(t, NT{T{N: 100, S: "test"}})},
+		{"struct", column(t, T{N: 100, S: "test"}), toJSON(t, T{N: "100", S: "test"})},
+		{"nested struct", column(t, NT{T{N: 100, S: "test"}}), toJSON(t, NT{T{N: "100", S: "test"}})},
 		{"timestamp", column(t, timestamp(t, "2002-10-02T10:00:00Z")), toJSON(t, "2002-10-02T10:00:00Z")},
 		{"bytes", column(t, []byte("test")), toJSON(t, []byte("test"))},
 	}
diff --git a/json_row_test.go b/json_row_test.go
index 09ac830..bdf1741 100644
--- a/json_row_test.go
+++ b/json_row_test.go
@@ -18,8 +18,8 @@ func TestJSONRow_MarshalJSON(t *testing.T) {
 	}{
 		{"null", row(t, nil), toJSON(t, nil)},
 		{"empty", row(t, R{}), toJSON(t, R{})},
-		{"single", row(t, R{"col1", 100}), toJSON(t, R{"col1", 100})},
-		{"multiple", row(t, R{"col1", 100, "col2", 10.5}), toJSON(t, R{"col1", 100, "col2", 10.5})},
+		{"single", row(t, R{"col1", 100}), toJSON(t, R{"col1", "100"})},
+		{"multiple", row(t, R{"col1", 100, "col2", 10.5}), toJSON(t, R{"col1", "100", "col2", 10.5})},
 	}
 
 	for _, tt := range cases {
@@ -42,7 +42,7 @@ func TestRows(t *testing.T) {
 	}{
 		{"null", rows(t, nil), toJSON(t, nil)},
 		{"empties", rows(t, []R{{}, {}}), toJSON(t, []R{{}, {}})},
-		{"singles", rows(t, []R{{"col1", 100}, {"col1", 200}}), toJSON(t, []R{{"col1", 100}, {"col1", 200}})},
+		{"singles", rows(t, []R{{"col1", 100}, {"col1", 200}}), toJSON(t, []R{{"col1", "100"}, {"col1", "200"}})},
 	}
 
 	for _, tt := range cases {