diff --git a/javascript/ql/lib/semmle/javascript/frameworks/VercelNode.qll b/javascript/ql/lib/semmle/javascript/frameworks/VercelNode.qll
index ae206c9f915..9dcb25cf5db 100644
--- a/javascript/ql/lib/semmle/javascript/frameworks/VercelNode.qll
+++ b/javascript/ql/lib/semmle/javascript/frameworks/VercelNode.qll
@@ -141,8 +141,8 @@ module VercelNode {
   }
 
   /**
-   * An argument to `res.send(...)` on a Vercel response, including chained
-   * calls such as `res.status(200).send(...)`.
+   * An argument to `res.send(...)`, `res.json(...)`, or `res.jsonp(...)` on a
+   * Vercel response, including chained calls such as `res.status(200).json(...)`.
    */
   private class ResponseSendArgument extends Http::ResponseSendArgument {
     RouteHandler rh;
@@ -150,7 +150,7 @@ module VercelNode {
     ResponseSendArgument() {
       exists(Http::Servers::ResponseSource src |
         (src instanceof ResponseSource or src instanceof ChainedResponseSource) and
-        this = src.ref().getAMethodCall("send").getArgument(0) and
+        this = src.ref().getAMethodCall(["send", "json", "jsonp"]).getArgument(0) and
         rh = src.getRouteHandler()
       )
     }
diff --git a/javascript/ql/test/library-tests/frameworks/vercel/src/vercel.ts b/javascript/ql/test/library-tests/frameworks/vercel/src/vercel.ts
index 0dae664e2c4..23956251ef4 100644
--- a/javascript/ql/test/library-tests/frameworks/vercel/src/vercel.ts
+++ b/javascript/ql/test/library-tests/frameworks/vercel/src/vercel.ts
@@ -22,6 +22,11 @@ export default function handler(req: VercelRequest, res: VercelResponse) {
   res.send(q);
   res.status(200).send(b);
 
+  // JSON response (direct and chained)
+  res.json(c);
+  res.status(200).json(u);
+  res.jsonp(host);
+
   // Redirect
   res.redirect(req.query.url as string);
 }
diff --git a/javascript/ql/test/library-tests/frameworks/vercel/tests.expected b/javascript/ql/test/library-tests/frameworks/vercel/tests.expected
index a2929999f23..92d309cc02f 100644
--- a/javascript/ql/test/library-tests/frameworks/vercel/tests.expected
+++ b/javascript/ql/test/library-tests/frameworks/vercel/tests.expected
@@ -1,27 +1,31 @@
 test_RouteHandler
 | src/now.ts:5:16:7:1 | functio ... ame);\\n} |
-| src/vercel.ts:9:16:27:1 | functio ... ing);\\n} |
+| src/vercel.ts:9:16:32:1 | functio ... ing);\\n} |
 test_RequestSource
 | src/now.ts:5:33:5:35 | req | src/now.ts:5:16:7:1 | functio ... ame);\\n} |
-| src/vercel.ts:9:33:9:35 | req | src/vercel.ts:9:16:27:1 | functio ... ing);\\n} |
+| src/vercel.ts:9:33:9:35 | req | src/vercel.ts:9:16:32:1 | functio ... ing);\\n} |
 test_ResponseSource
 | src/now.ts:5:50:5:52 | res | src/now.ts:5:16:7:1 | functio ... ame);\\n} |
-| src/vercel.ts:9:53:9:55 | res | src/vercel.ts:9:16:27:1 | functio ... ing);\\n} |
-| src/vercel.ts:23:3:23:17 | res.status(200) | src/vercel.ts:9:16:27:1 | functio ... ing);\\n} |
+| src/vercel.ts:9:53:9:55 | res | src/vercel.ts:9:16:32:1 | functio ... ing);\\n} |
+| src/vercel.ts:23:3:23:17 | res.status(200) | src/vercel.ts:9:16:32:1 | functio ... ing);\\n} |
+| src/vercel.ts:27:3:27:17 | res.status(200) | src/vercel.ts:9:16:32:1 | functio ... ing);\\n} |
 test_HeaderDefinition
-| src/vercel.ts:19:3:19:44 | res.set ... /html") | content-type | src/vercel.ts:9:16:27:1 | functio ... ing);\\n} |
+| src/vercel.ts:19:3:19:44 | res.set ... /html") | content-type | src/vercel.ts:9:16:32:1 | functio ... ing);\\n} |
 test_RedirectInvocation
-| src/vercel.ts:26:3:26:39 | res.red ... string) | src/vercel.ts:26:16:26:38 | req.que ...  string | src/vercel.ts:9:16:27:1 | functio ... ing);\\n} |
+| src/vercel.ts:31:3:31:39 | res.red ... string) | src/vercel.ts:31:16:31:38 | req.que ...  string | src/vercel.ts:9:16:32:1 | functio ... ing);\\n} |
 test_RequestInputAccess
 | src/now.ts:6:12:6:20 | req.query | parameter | src/now.ts:5:16:7:1 | functio ... ame);\\n} |
-| src/vercel.ts:11:13:11:21 | req.query | parameter | src/vercel.ts:9:16:27:1 | functio ... ing);\\n} |
-| src/vercel.ts:12:13:12:20 | req.body | body | src/vercel.ts:9:16:27:1 | functio ... ing);\\n} |
-| src/vercel.ts:13:13:13:23 | req.cookies | cookie | src/vercel.ts:9:16:27:1 | functio ... ing);\\n} |
-| src/vercel.ts:14:13:14:19 | req.url | url | src/vercel.ts:9:16:27:1 | functio ... ing);\\n} |
-| src/vercel.ts:15:16:15:31 | req.headers.host | header | src/vercel.ts:9:16:27:1 | functio ... ing);\\n} |
-| src/vercel.ts:16:15:16:33 | req.headers.referer | header | src/vercel.ts:9:16:27:1 | functio ... ing);\\n} |
-| src/vercel.ts:26:16:26:24 | req.query | parameter | src/vercel.ts:9:16:27:1 | functio ... ing);\\n} |
+| src/vercel.ts:11:13:11:21 | req.query | parameter | src/vercel.ts:9:16:32:1 | functio ... ing);\\n} |
+| src/vercel.ts:12:13:12:20 | req.body | body | src/vercel.ts:9:16:32:1 | functio ... ing);\\n} |
+| src/vercel.ts:13:13:13:23 | req.cookies | cookie | src/vercel.ts:9:16:32:1 | functio ... ing);\\n} |
+| src/vercel.ts:14:13:14:19 | req.url | url | src/vercel.ts:9:16:32:1 | functio ... ing);\\n} |
+| src/vercel.ts:15:16:15:31 | req.headers.host | header | src/vercel.ts:9:16:32:1 | functio ... ing);\\n} |
+| src/vercel.ts:16:15:16:33 | req.headers.referer | header | src/vercel.ts:9:16:32:1 | functio ... ing);\\n} |
+| src/vercel.ts:31:16:31:24 | req.query | parameter | src/vercel.ts:9:16:32:1 | functio ... ing);\\n} |
 test_ResponseSendArgument
 | src/now.ts:6:12:6:25 | req.query.name | src/now.ts:5:16:7:1 | functio ... ame);\\n} |
-| src/vercel.ts:22:12:22:12 | q | src/vercel.ts:9:16:27:1 | functio ... ing);\\n} |
-| src/vercel.ts:23:24:23:24 | b | src/vercel.ts:9:16:27:1 | functio ... ing);\\n} |
+| src/vercel.ts:22:12:22:12 | q | src/vercel.ts:9:16:32:1 | functio ... ing);\\n} |
+| src/vercel.ts:23:24:23:24 | b | src/vercel.ts:9:16:32:1 | functio ... ing);\\n} |
+| src/vercel.ts:26:12:26:12 | c | src/vercel.ts:9:16:32:1 | functio ... ing);\\n} |
+| src/vercel.ts:27:24:27:24 | u | src/vercel.ts:9:16:32:1 | functio ... ing);\\n} |
+| src/vercel.ts:28:13:28:16 | host | src/vercel.ts:9:16:32:1 | functio ... ing);\\n} |