Fix Task Queue Emulator error handling to display error message prope…

…rly (#7916)

* fix error message

CHANGELOG.md

@@ -1 +1,2 @@
+- Fix Task Queue Emulator error handling to display error message properly. (#7916)
 - Fixed some misleading logs when using the Data Connect emulator with `FIREBASE_DATACONNECT_POSTGRESQL_STRING` set.

src/emulator/tasksEmulator.ts

@@ -203,7 +203,11 @@ export class TasksEmulator implements EmulatorInstance {
       const locationId = req.params.location_id;
       const queueName = req.params.queue_name;
       if (!this.validateQueueId(queueName)) {
-        res.status(400).send("Invalid Queue ID");
+        res.status(400).json({
+          error:
+            "Queue ID must start with a letter followed by up to 62 letters, numbers, " +
+            "hyphens, or underscores and must end with a letter or a number",
+        });
         return;
       }
 
@@ -233,7 +237,7 @@ export class TasksEmulator implements EmulatorInstance {
         defaultUri: body.defaultUri,
       };
       if (taskQueueConfig.rateLimits.maxConcurrentDispatches > 5000) {
-        res.status(400).send("cannot set maxConcurrentDispatches to a value over 5000");
+        res.status(400).json({ error: "cannot set maxConcurrentDispatches to a value over 5000" });
         return;
       }