normalize modified options body

Author: ganigeorgiev

src/Client.ts

@@ -206,19 +206,15 @@ export default class Client {
     async send<T = any>(path: string, reqOptions: SendOptions): Promise<T> {
         let options = Object.assign({ method: 'GET' } as SendOptions, reqOptions);
 
-        // JSON serialize the body if needed and set the correct content type
+        // add the json header, if not already
         // (for FormData body the Content-Type header should be skipped since the boundary is autogenerated)
-        if (!this.isFormData(options.body)) {
-            if (options.body && typeof options.body !== 'string') {
-                options.body = JSON.stringify(options.body);
-            }
-
-            // add the json header (if not already)
-            if (typeof options?.headers?.['Content-Type'] === 'undefined') {
-                options.headers = Object.assign({}, options.headers, {
-                    'Content-Type': 'application/json',
-                });
-            }
+        if (
+            !this.isFormData(options.body) &&
+            typeof options?.headers?.['Content-Type'] === 'undefined'
+        ) {
+            options.headers = Object.assign({}, options.headers, {
+                'Content-Type': 'application/json',
+            });
         }
 
         // add Accept-Language header (if not already)
@@ -279,6 +275,15 @@ export default class Client {
             }
         }
 
+        // ensures that the json body is serialized
+        if (
+            options?.headers?.['Content-Type'] == 'application/json' &&
+            options.body &&
+            typeof options.body !== 'string'
+        ) {
+            options.body = JSON.stringify(options.body);
+        }
+
         // send the request
         return fetch(url, options)
             .then(async (response) => {