diff --git a/model/converter/json/fixtures/domain_01.json b/model/converter/json/fixtures/domain_01.json
index 581d3ffc23c..0193d43f842 100644
--- a/model/converter/json/fixtures/domain_01.json
+++ b/model/converter/json/fixtures/domain_01.json
@@ -57,6 +57,11 @@
           "vType": "FLOAT64",
           "vFloat64": 72.5
         },
+        {
+          "key": "javascript_limit",
+          "vType": "INT64",
+          "vInt64": 9223372036854775222
+        },
         {
           "key": "blob",
           "vType": "BINARY",
diff --git a/model/converter/json/fixtures/ui_01.json b/model/converter/json/fixtures/ui_01.json
index 06a61ddb6c7..7cc55463d36 100644
--- a/model/converter/json/fixtures/ui_01.json
+++ b/model/converter/json/fixtures/ui_01.json
@@ -62,6 +62,11 @@
           "type": "float64",
           "value": 72.5
         },
+        {
+          "key": "javascript_limit",
+          "type": "int64",
+          "value": "9223372036854775222"
+        },
         {
           "key": "blob",
           "type": "binary",
diff --git a/model/converter/json/from_domain.go b/model/converter/json/from_domain.go
index 2786b63a6bc..26c2e47d6f0 100644
--- a/model/converter/json/from_domain.go
+++ b/model/converter/json/from_domain.go
@@ -16,12 +16,18 @@
 package json
 
 import (
+	"fmt"
 	"strings"
 
 	"github.com/jaegertracing/jaeger/model"
 	"github.com/jaegertracing/jaeger/model/json"
 )
 
+const (
+	jsMaxSafeInteger = int64(1)<<53 - 1
+	jsMinSafeInteger = -jsMaxSafeInteger
+)
+
 // FromDomain converts model.Trace into json.Trace format.
 // It assumes that the domain model is valid, namely that all enums
 // have valid values, so that it does not need to check for errors.
@@ -122,6 +128,9 @@ func (fd fromDomain) convertKeyValues(keyValues model.KeyValues) []json.KeyValue
 			value = kv.Bool()
 		case model.Int64Type:
 			value = kv.Int64()
+			if kv.Int64() > jsMaxSafeInteger || kv.Int64() < jsMinSafeInteger {
+				value = fmt.Sprintf("%d", value)
+			}
 		case model.Float64Type:
 			value = kv.Float64()
 		case model.BinaryType: