diff --git a/.changeset/pretty-cherries-relate.md b/.changeset/pretty-cherries-relate.md
new file mode 100644
index 000000000000..abcee5441352
--- /dev/null
+++ b/.changeset/pretty-cherries-relate.md
@@ -0,0 +1,7 @@
+---
+"wrangler": patch
+---
+
+fix: infer experimentalJsonConfig from file extension
+
+Fixes [#5768](https://github.com/cloudflare/workers-sdk/issues/5768) - issue with vitest and Pages projects with wrangler.toml
diff --git a/fixtures/vitest-pool-workers-examples/pages-with-config/README.md b/fixtures/vitest-pool-workers-examples/pages-with-config/README.md
new file mode 100644
index 000000000000..4ca02e864f1e
--- /dev/null
+++ b/fixtures/vitest-pool-workers-examples/pages-with-config/README.md
@@ -0,0 +1,3 @@
+# pages-with-config
+
+Tests for regression of [#5768](https://github.com/cloudflare/workers-sdk/issues/5768)
diff --git a/fixtures/vitest-pool-workers-examples/pages-with-config/pages-config.test.ts b/fixtures/vitest-pool-workers-examples/pages-with-config/pages-config.test.ts
new file mode 100644
index 000000000000..1dc4818111f2
--- /dev/null
+++ b/fixtures/vitest-pool-workers-examples/pages-with-config/pages-config.test.ts
@@ -0,0 +1,5 @@
+import { expect, it } from "vitest";
+
+it("should run tests even if Pages project specifies wrangler.toml", () => {
+	expect(1).toBe(1);
+});
diff --git a/fixtures/vitest-pool-workers-examples/pages-with-config/tsconfig.json b/fixtures/vitest-pool-workers-examples/pages-with-config/tsconfig.json
new file mode 100644
index 000000000000..90e58bf03ef0
--- /dev/null
+++ b/fixtures/vitest-pool-workers-examples/pages-with-config/tsconfig.json
@@ -0,0 +1,4 @@
+{
+	"extends": "../tsconfig.node.json",
+	"include": ["./*.ts"]
+}
diff --git a/fixtures/vitest-pool-workers-examples/pages-with-config/vitest.config.ts b/fixtures/vitest-pool-workers-examples/pages-with-config/vitest.config.ts
new file mode 100644
index 000000000000..3f34c9327a9d
--- /dev/null
+++ b/fixtures/vitest-pool-workers-examples/pages-with-config/vitest.config.ts
@@ -0,0 +1,11 @@
+import { defineWorkersProject } from "@cloudflare/vitest-pool-workers/config";
+
+export default defineWorkersProject({
+	test: {
+		poolOptions: {
+			workers: {
+				wrangler: { configPath: "./wrangler.toml" },
+			},
+		},
+	},
+});
diff --git a/fixtures/vitest-pool-workers-examples/pages-with-config/wrangler.toml b/fixtures/vitest-pool-workers-examples/pages-with-config/wrangler.toml
new file mode 100644
index 000000000000..03a5499d8753
--- /dev/null
+++ b/fixtures/vitest-pool-workers-examples/pages-with-config/wrangler.toml
@@ -0,0 +1,6 @@
+#:schema node_modules/wrangler/config-schema.json
+name = "pages-with-config"
+compatibility_date = "2024-09-19"
+compatibility_flags = ["nodejs_compat"]
+pages_build_output_dir = "public"
+
diff --git a/packages/wrangler/src/api/integrations/platform/index.ts b/packages/wrangler/src/api/integrations/platform/index.ts
index b4c730bfbb9f..df384094e939 100644
--- a/packages/wrangler/src/api/integrations/platform/index.ts
+++ b/packages/wrangler/src/api/integrations/platform/index.ts
@@ -247,8 +247,15 @@ export function unstable_getMiniflareWorkerOptions(
 	define: Record<string, string>;
 	main?: string;
 } {
+	// experimental json is usually enabled via a cli arg,
+	// so it cannot be passed to the vitest integration.
+	// instead we infer it from the config path (instead of setting a default)
+	// because wrangler.json is not compatible with pages.
+	const isJsonConfigFile =
+		configPath.endsWith(".json") || configPath.endsWith(".jsonc");
+
 	const config = readConfig(configPath, {
-		experimentalJsonConfig: true,
+		experimentalJsonConfig: isJsonConfigFile,
 		env,
 	});