diff --git a/web/api/v1/json_codec.go b/web/api/v1/json_codec.go
index d30429706f..df3af66f0d 100644
--- a/web/api/v1/json_codec.go
+++ b/web/api/v1/json_codec.go
@@ -25,10 +25,10 @@ import (
 )
 
 func init() {
-	jsoniter.RegisterTypeEncoderFunc("promql.Series", marshalSeriesJSON, neverEmpty)
-	jsoniter.RegisterTypeEncoderFunc("promql.Sample", marshalSampleJSON, neverEmpty)
-	jsoniter.RegisterTypeEncoderFunc("promql.FPoint", marshalFPointJSON, neverEmpty)
-	jsoniter.RegisterTypeEncoderFunc("promql.HPoint", marshalHPointJSON, neverEmpty)
+	jsoniter.RegisterTypeEncoderFunc("promql.Series", unsafeMarshalSeriesJSON, neverEmpty)
+	jsoniter.RegisterTypeEncoderFunc("promql.Sample", unsafeMarshalSampleJSON, neverEmpty)
+	jsoniter.RegisterTypeEncoderFunc("promql.FPoint", unsafeMarshalFPointJSON, neverEmpty)
+	jsoniter.RegisterTypeEncoderFunc("promql.HPoint", unsafeMarshalHPointJSON, neverEmpty)
 	jsoniter.RegisterTypeEncoderFunc("exemplar.Exemplar", marshalExemplarJSON, neverEmpty)
 	jsoniter.RegisterTypeEncoderFunc("labels.Labels", unsafeMarshalLabelsJSON, labelsIsEmpty)
 }
@@ -66,8 +66,12 @@ func (j JSONCodec) Encode(resp *Response) ([]byte, error) {
 //	      < more histograms >
 //	   ],
 //	},
-func marshalSeriesJSON(ptr unsafe.Pointer, stream *jsoniter.Stream) {
+func unsafeMarshalSeriesJSON(ptr unsafe.Pointer, stream *jsoniter.Stream) {
 	s := *((*promql.Series)(ptr))
+	marshalSeriesJSON(s, stream)
+}
+
+func marshalSeriesJSON(s promql.Series, stream *jsoniter.Stream) {
 	stream.WriteObjectStart()
 	stream.WriteObjectField(`metric`)
 	marshalLabelsJSON(s.Metric, stream)
@@ -78,7 +82,7 @@ func marshalSeriesJSON(ptr unsafe.Pointer, stream *jsoniter.Stream) {
 			stream.WriteObjectField(`values`)
 			stream.WriteArrayStart()
 		}
-		marshalFPointJSON(unsafe.Pointer(&p), stream)
+		marshalFPointJSON(p, stream)
 	}
 	if len(s.Floats) > 0 {
 		stream.WriteArrayEnd()
@@ -89,7 +93,7 @@ func marshalSeriesJSON(ptr unsafe.Pointer, stream *jsoniter.Stream) {
 			stream.WriteObjectField(`histograms`)
 			stream.WriteArrayStart()
 		}
-		marshalHPointJSON(unsafe.Pointer(&p), stream)
+		marshalHPointJSON(p, stream)
 	}
 	if len(s.Histograms) > 0 {
 		stream.WriteArrayEnd()
@@ -123,8 +127,12 @@ func neverEmpty(unsafe.Pointer) bool {
 //	   },
 //	   "histogram": [ 1435781451.781, { < histogram, see jsonutil.MarshalHistogram > } ]
 //	},
-func marshalSampleJSON(ptr unsafe.Pointer, stream *jsoniter.Stream) {
+func unsafeMarshalSampleJSON(ptr unsafe.Pointer, stream *jsoniter.Stream) {
 	s := *((*promql.Sample)(ptr))
+	marshalSampleJSON(s, stream)
+}
+
+func marshalSampleJSON(s promql.Sample, stream *jsoniter.Stream) {
 	stream.WriteObjectStart()
 	stream.WriteObjectField(`metric`)
 	marshalLabelsJSON(s.Metric, stream)
@@ -147,8 +155,12 @@ func marshalSampleJSON(ptr unsafe.Pointer, stream *jsoniter.Stream) {
 }
 
 // marshalFPointJSON writes `[ts, "1.234"]`.
-func marshalFPointJSON(ptr unsafe.Pointer, stream *jsoniter.Stream) {
+func unsafeMarshalFPointJSON(ptr unsafe.Pointer, stream *jsoniter.Stream) {
 	p := *((*promql.FPoint)(ptr))
+	marshalFPointJSON(p, stream)
+}
+
+func marshalFPointJSON(p promql.FPoint, stream *jsoniter.Stream) {
 	stream.WriteArrayStart()
 	jsonutil.MarshalTimestamp(p.T, stream)
 	stream.WriteMore()
@@ -157,8 +169,12 @@ func marshalFPointJSON(ptr unsafe.Pointer, stream *jsoniter.Stream) {
 }
 
 // marshalHPointJSON writes `[ts, { < histogram, see jsonutil.MarshalHistogram > } ]`.
-func marshalHPointJSON(ptr unsafe.Pointer, stream *jsoniter.Stream) {
+func unsafeMarshalHPointJSON(ptr unsafe.Pointer, stream *jsoniter.Stream) {
 	p := *((*promql.HPoint)(ptr))
+	marshalHPointJSON(p, stream)
+}
+
+func marshalHPointJSON(p promql.HPoint, stream *jsoniter.Stream) {
 	stream.WriteArrayStart()
 	jsonutil.MarshalTimestamp(p.T, stream)
 	stream.WriteMore()