fix: support express jsonParser middleware if used in the Express app (#309)

* fix: support express jsonParser middleware if used in the Express app

* Create sixty-windows-run.md

---------

Co-authored-by: Eric Allam <eallam@icloud.com>

.changeset/sixty-windows-run.md

@@ -0,0 +1,5 @@
+---
+"@trigger.dev/express": patch
+---
+
+fix: support express jsonParser middleware if used in the Express app

packages/express/src/index.ts

@@ -97,6 +97,6 @@ function convertToStandardRequest(req: express.Request): StandardRequest {
     headers,
     method,
     // @ts-ignore
-    body: req,
+    body: req.body ? JSON.stringify(req.body) : req,
   });
 }