Honor declared MIME type for auto-serialized JSON resources

strawgate · strawgate · commit 1759276a4b98 · 2026-04-13T01:36:54.000Z
diff --git a/src/fastmcp/resources/base.py b/src/fastmcp/resources/base.py
@@ -347,7 +347,7 @@ def convert_result(self, raw_value: Any) -> ResourceResult:
                 [
                     ResourceContent(
                         json.dumps(raw_value),
-                        mime_type="application/json",
+                        mime_type=self.mime_type or "application/json",
                         meta=self.meta,
                     )
                 ]

Original file line number	Diff line number	Diff line change
`@@ -347,7 +347,7 @@ def convert_result(self, raw_value: Any) -> ResourceResult:`
`347`	`347`	`[`
`348`	`348`	`ResourceContent(`
`349`	`349`	`json.dumps(raw_value),`
`350`		`- mime_type="application/json",`
	`350`	`+ mime_type=self.mime_type or "application/json",`
`351`	`351`	`meta=self.meta,`
`352`	`352`	`)`
`353`	`353`	`]`