diff --git a/parser.go b/parser.go
index bb983355e..eab7776bc 100644
--- a/parser.go
+++ b/parser.go
@@ -1165,6 +1165,11 @@ func (parser *Parser) parseField(pkgName string, field *ast.Field) (*structField
 		return &structField{name: ""}, nil
 	}
 
+	// Skip non-exported fields.
+	if !ast.IsExported(field.Names[0].Name) {
+		return &structField{name: ""}, nil
+	}
+
 	structField := &structField{
 		name:       field.Names[0].Name,
 		schemaType: prop.SchemaType,
diff --git a/parser_test.go b/parser_test.go
index a06146712..7baa835c0 100644
--- a/parser_test.go
+++ b/parser_test.go
@@ -1947,6 +1947,81 @@ func TestParseStructComment(t *testing.T) {
 	assert.Equal(t, expected, string(b))
 }
 
+func TestParseNonExportedJSONFields(t *testing.T) {
+	expected := `{
+    "swagger": "2.0",
+    "info": {
+        "description": "This is a sample server.",
+        "title": "Swagger Example API",
+        "contact": {},
+        "license": {},
+        "version": "1.0"
+    },
+    "host": "localhost:4000",
+    "basePath": "/api",
+    "paths": {
+        "/so-something": {
+            "get": {
+                "description": "Does something, but internal (non-exported) fields inside a struct won't be marshaled into JSON",
+                "consumes": [
+                    "application/json"
+                ],
+                "produces": [
+                    "application/json"
+                ],
+                "summary": "Call DoSomething",
+                "responses": {
+                    "200": {
+                        "description": "OK",
+                        "schema": {
+                            "type": "string"
+                        }
+                    }
+                }
+            }
+        }
+    },
+    "definitions": {
+        "main.MyStruct": {
+            "type": "object",
+            "properties": {
+                "data": {
+                    "description": "Post data",
+                    "type": "object",
+                    "properties": {
+                        "name": {
+                            "description": "Post tag",
+                            "type": "array",
+                            "items": {
+                                "type": "string"
+                            }
+                        }
+                    }
+                },
+                "id": {
+                    "type": "integer",
+                    "format": "int64",
+                    "example": 1
+                },
+                "name": {
+                    "description": "Post name",
+                    "type": "string",
+                    "example": "poti"
+                }
+            }
+        }
+    }
+}`
+
+	searchDir := "testdata/non_exported_json_fields"
+	mainAPIFile := "main.go"
+	p := New()
+	err := p.ParseAPI(searchDir, mainAPIFile)
+	assert.NoError(t, err)
+	b, _ := json.MarshalIndent(p.swagger, "", "    ")
+	assert.Equal(t, expected, string(b))
+}
+
 func TestParsePetApi(t *testing.T) {
 	expected := `{
     "schemes": [
diff --git a/testdata/json_field_string/main.go b/testdata/json_field_string/main.go
new file mode 100644
index 000000000..04515dccb
--- /dev/null
+++ b/testdata/json_field_string/main.go
@@ -0,0 +1,39 @@
+package main
+
+import (
+	"github.com/gin-gonic/gin"
+)
+
+type MyStruct struct {
+	ID int `json:"id" example:"1" format:"int64"`
+	// Post name
+	Name string `json:"name" example:"poti"`
+	// Post data
+	Data struct {
+		// Post tag
+		Tag []string `json:"name"`
+	} `json:"data"`
+	// Integer represented by a string
+	MyInt int `json:"myint,string"`
+}
+
+// @Summary Call DoSomething
+// @Description Does something, but internal (non-exported) fields inside a struct won't be marshaled into JSON
+// @Accept  json
+// @Produce  json
+// @Success 200 {string} MyStruct
+// @Router /so-something [get]
+func DoSomething(c *gin.Context) {
+	//write your code
+}
+
+// @title Swagger Example API
+// @version 1.0
+// @description This is a sample server.
+// @host localhost:4000
+// @basePath /api
+func main() {
+	r := gin.New()
+	r.GET("/do-something", api.DoSomething)
+	r.Run()
+}
diff --git a/testdata/non_exported_json_fields/main.go b/testdata/non_exported_json_fields/main.go
new file mode 100644
index 000000000..ed641c38d
--- /dev/null
+++ b/testdata/non_exported_json_fields/main.go
@@ -0,0 +1,44 @@
+package main
+
+import (
+	"github.com/gin-gonic/gin"
+)
+
+type MyStruct struct {
+	ID int `json:"id" example:"1" format:"int64"`
+	// Post name
+	Name string `json:"name" example:"poti"`
+	// Post data
+	Data struct {
+		// Post tag
+		Tag []string `json:"name"`
+	} `json:"data"`
+	// not-exported variable, for internal use only, not marshaled
+	internal1 string
+	internal2 int
+	internal3 bool
+	internal4 struct {
+		NestedInternal string
+	}
+}
+
+// @Summary Call DoSomething
+// @Description Does something, but internal (non-exported) fields inside a struct won't be marshaled into JSON
+// @Accept  json
+// @Produce  json
+// @Success 200 {string} MyStruct
+// @Router /so-something [get]
+func DoSomething(c *gin.Context) {
+	//write your code
+}
+
+// @title Swagger Example API
+// @version 1.0
+// @description This is a sample server.
+// @host localhost:4000
+// @basePath /api
+func main() {
+	r := gin.New()
+	r.GET("/do-something", api.DoSomething)
+	r.Run()
+}
diff --git a/testdata/simple2/web/handler.go b/testdata/simple2/web/handler.go
index d9a568692..1ab61b920 100644
--- a/testdata/simple2/web/handler.go
+++ b/testdata/simple2/web/handler.go
@@ -53,8 +53,8 @@ type Pet struct {
 	Hidden          string `json:"-"`
 	UUID            uuid.UUID
 	Decimal         decimal.Decimal
-	customString    CustomString
-	customStringArr []CustomString
+	CustomString    CustomString
+	CustomStringArr []CustomString
 	NullInt         sql.NullInt64 `swaggertype:"integer"`
 	Coeffs          []big.Float   `swaggertype:"array,number"`
 	Birthday        TimestampTime `swaggertype:"primitive,integer"`