Add test for FieldNameTag

fixtures/test_config.json

@@ -0,0 +1,23 @@
+{
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "$id": "https://github.com/invopop/jsonschema/config",
+  "$ref": "#/$defs/Config",
+  "$defs": {
+    "Config": {
+      "properties": {
+        "name": {
+          "type": "string"
+        },
+        "count": {
+          "type": "integer"
+        }
+      },
+      "additionalProperties": false,
+      "type": "object",
+      "required": [
+        "name",
+        "count"
+      ]
+    }
+  }
+}

reflect.go

@@ -183,6 +183,9 @@ type Reflector struct {
 	// root as opposed to a definition with a reference.
 	ExpandedStruct bool
 
+	// FieldNameTag will change the tag used to get field names. json tags are used by default.
+	FieldNameTag string
+
 	// IgnoredTypes defines a slice of types that should be ignored in the schema,
 	// switching to just allowing additional properties instead.
 	IgnoredTypes []interface{}
@@ -989,7 +992,11 @@ func ignoredByJSONSchemaTags(tags []string) bool {
 }
 
 func (r *Reflector) reflectFieldName(f reflect.StructField) (string, bool, bool, bool) {
-	jsonTagString, _ := f.Tag.Lookup("json")
+	tagKey := r.FieldNameTag
+	if tagKey == "" {
+		tagKey = "json"
+	}
+	jsonTagString := f.Tag.Get(tagKey)
 	jsonTags := strings.Split(jsonTagString, ",")
 
 	if ignoredByJSONTags(jsonTags) {

reflect_test.go

@@ -545,3 +545,15 @@ func TestArrayFormat(t *testing.T) {
 	pt := p.Items.Format
 	require.Equal(t, pt, "uri")
 }
+
+func TestFieldNameTag(t *testing.T) {
+	type Config struct {
+		Name  string `yaml:"name"`
+		Count int    `yaml:"count"`
+	}
+
+	r := Reflector{
+		FieldNameTag: "yaml",
+	}
+	compareSchemaOutput(t, "fixtures/test_config.json", &r, &Config{})
+}